Ql Please 160 PP and 160 TSX FB- 280 AI

[longrangehunter]

So I'm hoping with the data I have will correlate to what QL shows w/o the H2O capacity? (I can weight the H2O capacity if need be BTW)

Oh, the avg bullet length is 1.2490" or .6567 bullet to ogive.

280 AI**** 24" bbl. 1:10" twist
Woodleigh 160 PP @ 2.700" CBTO = 3.34"-3.35" COAL (The noses of this bullets can be that much off)
in Nosler Brass.

53.5 H4350 velocity recorded at 23' and 22' from the muzzle.
2824-2834
2826--2842
2841-2854
2813-2827
2823-2835
Net avg. 2,832 @ 22.5' from muzzle.

Two sets with RL-22 same at 23' and 22' from muzzle.
59.1 RL-22
2882-2894
2875-2882
2894-2905
2887-2894
2857-2864
Net avg. 2,893 @ 22.5' from muzzle.

60.5 RL-22
2954-2952
2944-2942
2910-2912
2950-2952
Net avg. 2,940 @ 22.5' from muzzle.

56.0 RL-22 produced 2745-2744 (only 1 shot).

BTW thanks in advance for the work in doing this.... I'd like to put this behind me.... It's just am obsessed with wanting to make these bullets work! lol

 

[longrangehunter]

I have one more... sorry.

Same bullet Woodleigh 160 PP @ 2.700'' CBTO = 3.34"-3.35" COAL

54.7 IMR-4831
Avg. 2739 @ 22.5'

56.7 IMR-4831
Avg. 2836 @ 22.5'

Thanks!

 

[SJB358]

Cartridge : .280 Ack Imp
Bullet : .284, 160, Woodleigh PP 75
Useable Case Capaci: 67.250 grain H2O = 4.366 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.466% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-04.7 88 52.15 2635 2467 44610 10453 99.8 1.387
-04.2 88 52.41 2647 2489 45213 10487 99.8 1.379
-03.7 89 52.66 2658 2511 45824 10520 99.8 1.370
-03.3 89 52.92 2670 2532 46442 10553 99.9 1.361
-02.8 90 53.17 2681 2554 47068 10584 99.9 1.352
-02.3 90 53.43 2693 2576 47702 10615 99.9 1.344
-01.9 90 53.68 2704 2598 48344 10644 100.0 1.336
-01.4 91 53.94 2716 2620 48994 10673 100.0 1.327
-00.9 91 54.19 2727 2642 49652 10701 100.0 1.319
-00.5 92 54.45 2738 2664 50318 10728 100.0 1.311
+00.0 92 54.70 2749 2686 50993 10754 100.0 1.303
+00.5 93 54.95 2761 2708 51676 10779 100.0 1.295
+00.9 93 55.21 2772 2730 52368 10805 100.0 1.286
+01.4 93 55.46 2783 2752 53069 10830 100.0 1.278
+01.9 94 55.72 2794 2774 53779 10855 100.0 1.271
+02.3 94 55.97 2806 2796 54497 10880 100.0 1.263

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 92 54.70 2851 2888 60497 10366 100.0 1.208 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 92 54.70 2598 2399 41575 10888 97.4 1.428


Cartridge : .280 Ack Imp
Bullet : .284, 160, Woodleigh PP 75
Useable Case Capaci: 67.250 grain H2O = 4.366 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.45% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-04.5 91 54.15 2725 2638 49549 10697 100.0 1.320
-04.0 92 54.41 2736 2660 50214 10724 100.0 1.312
-03.6 92 54.66 2748 2682 50887 10750 100.0 1.304
-03.1 93 54.92 2759 2704 51569 10775 100.0 1.296
-02.7 93 55.17 2770 2727 52260 10801 100.0 1.288
-02.2 93 55.43 2781 2749 52959 10826 100.0 1.280
-01.8 94 55.68 2793 2771 53667 10851 100.0 1.272
-01.3 94 55.94 2804 2793 54385 10876 100.0 1.264
-00.9 95 56.19 2815 2815 55111 10901 100.0 1.256
-00.4 95 56.45 2826 2837 55846 10926 100.0 1.249 ! Near Maximum !
+00.0 96 56.70 2837 2860 56591 10951 100.0 1.241 ! Near Maximum !
+00.4 96 56.95 2848 2882 57346 10975 100.0 1.233 ! Near Maximum !
+00.9 96 57.21 2859 2904 58110 11000 100.0 1.226 ! Near Maximum !
+01.3 97 57.46 2870 2927 58884 11024 100.0 1.219 ! Near Maximum !
+01.8 97 57.72 2881 2949 59668 11048 100.0 1.211 ! Near Maximum !
+02.2 98 57.97 2892 2972 60461 11072 100.0 1.204 ! Near Maximum !

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 96 56.70 2933 3057 67039 10573 100.0 1.154 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 96 56.70 2692 2574 46180 11244 98.5 1.358


Looks pretty close to what you're seeing Kevin

 

[SJB358]

H4350 looks to be quite alot off from what you recorded.

Cartridge : .280 Ack Imp
Bullet : .284, 160, Woodleigh PP 75
Useable Case Capaci: 67.250 grain H2O = 4.366 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4350

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.477% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-04.8 84 50.95 2566 2339 42482 10171 97.0 1.398
-04.3 84 51.21 2578 2360 43037 10220 97.2 1.389
-03.8 85 51.46 2589 2382 43599 10269 97.3 1.380
-03.3 85 51.72 2601 2403 44164 10317 97.5 1.372
-02.9 86 51.97 2612 2425 44744 10365 97.6 1.364
-02.4 86 52.23 2624 2446 45327 10412 97.7 1.355
-01.9 87 52.48 2636 2468 45917 10458 97.9 1.347
-01.4 87 52.74 2647 2490 46514 10504 98.0 1.339
-01.0 87 52.99 2659 2512 47118 10549 98.1 1.331
-00.5 88 53.25 2670 2533 47730 10594 98.2 1.322
+00.0 88 53.50 2682 2555 48349 10638 98.4 1.314
+00.5 89 53.75 2693 2577 48976 10681 98.5 1.306
+01.0 89 54.01 2705 2600 49611 10724 98.6 1.299
+01.4 89 54.26 2717 2622 50252 10766 98.7 1.291
+01.9 90 54.52 2728 2644 50903 10807 98.8 1.283
+02.4 90 54.77 2739 2666 51561 10848 98.9 1.275

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 88 53.50 2795 2776 56354 10476 100.0 1.226 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 88 53.50 2531 2276 40472 10319 92.9 1.428

 

[SJB358]

And RL22


Cartridge : .280 Ack Imp
Bullet : .284, 160, Woodleigh PP 75
Useable Case Capaci: 67.250 grain H2O = 4.366 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-22

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.421% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step Fill. Charge Vel. Energy Pmax Pmuz Prop.Burnt B_Time
% % Grains fps ft.lbs psi psi % ms

-04.2 92 57.95 2723 2634 45327 11973 97.0 1.352
-03.8 93 58.21 2735 2658 45948 12024 97.2 1.344
-03.4 93 58.46 2748 2682 46577 12075 97.3 1.336
-03.0 94 58.72 2760 2706 47214 12125 97.5 1.327
-02.5 94 58.97 2772 2731 47858 12174 97.6 1.319
-02.1 95 59.23 2785 2755 48510 12222 97.8 1.310
-01.7 95 59.48 2797 2779 49170 12270 97.9 1.302
-01.3 95 59.74 2809 2804 49837 12316 98.0 1.294
-00.8 96 59.99 2821 2828 50513 12362 98.2 1.286
-00.4 96 60.25 2834 2853 51198 12407 98.3 1.278
+00.0 97 60.50 2846 2878 51892 12451 98.4 1.270
+00.4 97 60.75 2858 2903 52595 12494 98.5 1.262
+00.8 97 61.01 2871 2928 53309 12537 98.7 1.254
+01.3 98 61.26 2883 2953 54032 12578 98.8 1.246
+01.7 98 61.52 2895 2978 54765 12619 98.9 1.239
+02.1 99 61.77 2907 3003 55508 12658 99.0 1.231 ! Near Maximum !

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba 97 60.50 2990 3176 62913 12180 100.0 1.169 ! Near Maximum !
Data for burning rate decreased by 10% relative to nominal value:
-Ba 97 60.50 2651 2497 41483 11993 92.0 1.401

 

[longrangehunter]

Thanks Scotty! Interesting, so why is the data so far off for H4350, and RL-22 do you think?

Looks like 100 fps for Rl-22, and about the same for H4350 if you take into account the data was taken 22' from the muzzle, which I add roughly 1 fps per foot plus or minus a few feet.

I noticed the screen was reading the bullet still gaining velocity at the second screen, and something I've never seen before, but at the end of the day my printer was acting up and I didn't have a new battery to put in.

 

[SJB358]

Kevin, I would so it is the lot of powder difference that you are seeing. I can adjust QL to mimic what you are seeing but if you go by PSI vs the charge you can see where you can go and still be in the safe zone with your current lot of powder.

 

[longrangehunter]

So I understand that part and why I've always watched, and stayed within the expected velocity range for a given bullet weight. The IMR-4831 is accurate from what I'm seeing, so how far then is it showing Max vs. these low numbers for H4350, Rl-22?

I noticed the Hodgdon Data was in the 60,000-62,000 psi range, most in the mid 61,000 area. So when does these three powders IMR-4831, H4350, RL-22 reach that level? I'd assume at the expected velocity, correct?

I'd like to know how my numbers correlate to the OBT B_time so I can see where I am OBT wise?

 

[longrangehunter]

Would some please run me a QL based off the Woodleigh 160 PP @ 3.450" using IMR-4831, and the 160 TSX FB @3.300" using RL-22 (I get roughly 2,950 w/ 56.0 RL-22).

 

[DrMike]

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Woodleigh PP  75
Useable Case Capaci: 68.850 grain H2O = 4.470 cm³
Cartridge O.A.L. L6: 3.450 inch = 87.63 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   89    54.00   2626    2450   47196  11978     99.8    1.288
-09.0   90    54.60   2653    2500   48670  12067     99.9    1.269
-08.0   91    55.20   2679    2550   50188  12150     99.9    1.250
-07.0   92    55.80   2705    2600   51749  12228    100.0    1.232
-06.0   93    56.40   2731    2651   53356  12300    100.0    1.215
-05.0   94    57.00   2757    2701   55010  12369    100.0    1.197
-04.0   95    57.60   2783    2752   56712  12437    100.0    1.180  ! Near Maximum !
-03.0   96    58.20   2809    2803   58465  12503    100.0    1.163  ! Near Maximum !
-02.0   97    58.80   2835    2855   60269  12570    100.0    1.147  ! Near Maximum !
-01.0   98    59.40   2860    2906   62126  12635    100.0    1.131  ! Near Maximum !
+00.0   99    60.00   2885    2958   64039  12699    100.0    1.115  ! Near Maximum !
+01.0  100    60.60   2911    3010   66009  12763    100.0    1.099  !DANGEROUS LOAD-DO NOT USE!
+02.0  101    61.20   2936    3062   68038  12826    100.0    1.084  !DANGEROUS LOAD-DO NOT USE!
+03.0  102    61.80   2961    3114   70129  12888    100.0    1.069  !DANGEROUS LOAD-DO NOT USE!
+04.0  103    62.40   2986    3167   72283  12949    100.0    1.055  !DANGEROUS LOAD-DO NOT USE!
+05.0  104    63.00   3010    3220   74503  13009    100.0    1.040  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     99    60.00   2978    3151   75587  12292    100.0    1.037  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     99    60.00   2744    2676   52431  13111     99.0    1.220

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Barnes 'TSX' 30291
Useable Case Capaci: 66.128 grain H2O = 4.294 cm³
Cartridge O.A.L. L6: 3.450 inch = 87.63 mm
Barrel Length      : 22.0 inch = 558.8 mm
Powder             : Alliant Reloder-22

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   92    56.79   2652    2499   46355  12857     96.2    1.278
-09.0   93    57.42   2683    2557   47900  13005     96.7    1.261
-08.0   94    58.05   2713    2614   49496  13148     97.1    1.244
-07.0   95    58.68   2743    2673   51140  13286     97.4    1.228
-06.0   96    59.31   2773    2732   52836  13420     97.8    1.209
-05.0   97    59.95   2803    2792   54584  13548     98.1    1.190
-04.0   98    60.58   2833    2852   56388  13671     98.4    1.172  ! Near Maximum !
-03.0   99    61.21   2863    2913   58257  13788     98.7    1.154  ! Near Maximum !
-02.0  100    61.84   2893    2974   60191  13900     99.0    1.137  ! Near Maximum !
-01.0  101    62.47   2924    3037   62195  14005     99.2    1.119  ! Near Maximum !
+00.0  102    63.10   2954    3099   64270  14104     99.4    1.102  ! Near Maximum !
+01.0  103    63.73   2984    3163   66420  14197     99.5    1.086  !DANGEROUS LOAD-DO NOT USE!
+02.0  104    64.36   3014    3226   68648  14283     99.7    1.069  !DANGEROUS LOAD-DO NOT USE!
+03.0  105    64.99   3043    3291   70958  14362     99.8    1.053  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    65.62   3073    3356   73353  14435     99.9    1.037  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    66.26   3103    3421   75837  14500    100.0    1.021  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    102    63.10   3087    3385   77278  13648    100.0    1.019  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    102    63.10   2767    2719   51645  13833     94.3    1.212

 

[longrangehunter]

Mike, would you mind inputting 24" into the data for the 160 PP IMR-4831 @ 3.350" my bad.

The RL-22 is way off the velocity I'm seeing.

Thanks

 

[DrMike]

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Woodleigh PP  75
Useable Case Capaci: 67.250 grain H2O = 4.366 cm³
Cartridge O.A.L. L6: 3.350 inch = 85.09 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   90    53.19   2682    2556   47116  10587     99.9    1.352
-09.0   91    53.78   2709    2607   48599  10656    100.0    1.332
-08.0   92    54.37   2735    2657   50126  10720    100.0    1.313
-07.0   93    54.96   2761    2709   51697  10780    100.0    1.294
-06.0   94    55.55   2787    2760   53315  10839    100.0    1.276
-05.0   95    56.15   2813    2811   54981  10897    100.0    1.258
-04.0   96    56.74   2839    2863   56697  10954    100.0    1.240  ! Near Maximum !
-03.0   97    57.33   2864    2915   58463  11011    100.0    1.223  ! Near Maximum !
-02.0   98    57.92   2890    2967   60283  11067    100.0    1.206  ! Near Maximum !
-01.0   99    58.51   2915    3019   62157  11122    100.0    1.189  ! Near Maximum !
+00.0  100    59.10   2940    3071   64088  11176    100.0    1.172  ! Near Maximum !
+01.0  101    59.69   2965    3124   66078  11230    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
+02.0  102    60.28   2990    3177   68128  11283    100.0    1.140  !DANGEROUS LOAD-DO NOT USE!
+03.0  103    60.87   3015    3230   70242  11335    100.0    1.125  !DANGEROUS LOAD-DO NOT USE!
+04.0  104    61.46   3040    3283   72421  11387    100.0    1.110  !DANGEROUS LOAD-DO NOT USE!
+05.0  105    62.06   3065    3337   74667  11437    100.0    1.095  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    100    59.10   3030    3262   75772  10810    100.0    1.093  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    100    59.10   2803    2792   52373  11607     99.4    1.280

 

[DrMike]

Reset the TSX to match what you had requested. My bad.

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Barnes 'TSX' 30291
Useable Case Capaci: 63.727 grain H2O = 4.138 cm³
Cartridge O.A.L. L6: 3.300 inch = 83.82 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-22

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   93    55.44   2705    2599   46093  11327     96.8    1.342
-09.0   94    56.06   2735    2658   47637  11449     97.2    1.324
-08.0   95    56.67   2765    2717   49239  11567     97.5    1.306
-07.0   96    57.29   2796    2777   50901  11681     97.9    1.289
-06.0   97    57.90   2826    2837   52626  11790     98.2    1.270
-05.0   99    58.52   2856    2898   54405  11894     98.5    1.250
-04.0  100    59.14   2886    2960   56242  11993     98.8    1.231  ! Near Maximum !
-03.0  101    59.75   2916    3022   58138  12086     99.0    1.213  ! Near Maximum !
-02.0  102    60.37   2947    3085   60098  12175     99.2    1.194  ! Near Maximum !
-01.0  103    60.98   2977    3148   62128  12258     99.4    1.176  ! Near Maximum !
+00.0  104    61.60   3007    3212   64233  12335     99.6    1.159  ! Near Maximum !
+01.0  105    62.22   3037    3276   66416  12407     99.7    1.141  !DANGEROUS LOAD-DO NOT USE!
+02.0  106    62.83   3067    3341   68681  12472     99.8    1.124  !DANGEROUS LOAD-DO NOT USE!
+03.0  107    63.45   3097    3407   71031  12532     99.9    1.107  !DANGEROUS LOAD-DO NOT USE!
+04.0  108    64.06   3126    3472   73470  12585    100.0    1.090  !DANGEROUS LOAD-DO NOT USE!
+05.0  109    64.68   3156    3539   76003  12632    100.0    1.074  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba    104    61.60   3137    3496   77446  11882    100.0    1.072  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    104    61.60   2821    2827   51545  12190     94.9    1.272

 

[longrangehunter]

Thanks Mike!

I think there is a #5 node somewhere in the 57.2-57.4 range with IMR-4831, and that bullet. I saw it first with the 54.7 charge, and close with 56.7, so this should give me something to test again even though I was ready to just drop it altogether, and use the loads I already have made up until now.

I think the old load I found in 2004 with the 160 TSX FB is still a super load with a great hunting bullet. I thought these Woodleigh's would be too, but I'm still on the fence to even use the (2) boxes I have or not?

Thanks again Mike, and Scotty for the info.

 

[Dwh7271]

These come close to what you saw.

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Woodleigh PP  75
Useable Case Capaci: 67.092 grain H2O = 4.356 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H4350 ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.935% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-09.3   80    48.50   2608    2417   45790   9768     99.8    1.352
-08.4   81    49.00   2631    2459   46984   9837     99.8    1.335
-07.5   82    49.50   2653    2500   48206   9904     99.9    1.319
-06.5   83    50.00   2675    2542   49456   9968    100.0    1.304
-05.6   83    50.50   2697    2583   50735  10029    100.0    1.288
-04.7   84    51.00   2718    2625   52043  10086    100.0    1.273
-03.7   85    51.50   2740    2667   53381  10142    100.0    1.258
-02.8   86    52.00   2761    2709   54751  10197    100.0    1.244
-01.9   87    52.50   2783    2751   56152  10252    100.0    1.229  ! Near Maximum !
-00.9   88    53.00   2804    2793   57585  10307    100.0    1.215  ! Near Maximum !
+00.0   88    53.50   2825    2836   59052  10360    100.0    1.201  ! Near Maximum !
+00.9   89    54.00   2846    2878   60553  10414    100.0    1.188  ! Near Maximum !
+01.9   90    54.50   2867    2921   62089  10467    100.0    1.174  ! Near Maximum !
+02.8   91    55.00   2888    2963   63661  10519    100.0    1.161  ! Near Maximum !
+03.7   92    55.50   2909    3006   65270  10571    100.0    1.148  !DANGEROUS LOAD-DO NOT USE!
+04.7   93    56.00   2929    3049   66917  10623    100.0    1.136  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     88    53.50   2868    2923   63571  10194    100.0    1.164  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba     88    53.50   2772    2730   54505  10550     99.9    1.245

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Woodleigh PP  75
Useable Case Capaci: 67.092 grain H2O = 4.356 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : IMR 4831

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.882% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-08.8   87    51.70   2618    2434   43734  10383     99.7    1.400
-07.9   88    52.20   2640    2477   44905  10451     99.8    1.383
-07.1   89    52.70   2663    2520   46104  10516     99.9    1.366
-06.2   90    53.20   2686    2562   47333  10578     99.9    1.349
-05.3   91    53.70   2708    2605   48593  10636    100.0    1.332
-04.4   92    54.20   2730    2648   49885  10691    100.0    1.316
-03.5   92    54.70   2753    2692   51208  10743    100.0    1.300
-02.6   93    55.20   2775    2735   52564  10792    100.0    1.284
-01.8   94    55.70   2797    2779   53955  10842    100.0    1.269
-00.9   95    56.20   2818    2822   55380  10890    100.0    1.253  ! Near Maximum !
+00.0   96    56.70   2840    2866   56842  10939    100.0    1.239  ! Near Maximum !
+00.9   97    57.20   2862    2910   58340  10987    100.0    1.224  ! Near Maximum !
+01.8   97    57.70   2883    2954   59877  11034    100.0    1.209  ! Near Maximum !
+02.6   98    58.20   2905    2998   61452  11081    100.0    1.195  ! Near Maximum !
+03.5   99    58.70   2926    3042   63068  11127    100.0    1.181  ! Near Maximum !
+04.4  100    59.20   2948    3087   64725  11173    100.0    1.167  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     96    56.70   2893    2973   62105  10733    100.0    1.192  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba     96    56.70   2775    2736   51586  11163     99.8    1.293

Cartridge          : .280 Ack Imp
Bullet             : .284, 160, Woodleigh PP  75
Useable Case Capaci: 67.092 grain H2O = 4.356 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-22 ?

Predicted data by increasing and decreasing the given charge,
incremented in steps of 0.826% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-08.3   89    55.50   2706    2601   45099  11603     98.3    1.361
-07.4   90    56.00   2729    2647   46308  11693     98.6    1.344
-06.6   90    56.50   2753    2693   47547  11780     98.8    1.327
-05.8   91    57.00   2777    2740   48819  11864     99.0    1.311
-05.0   92    57.50   2801    2787   50124  11944     99.2    1.295
-04.1   93    58.00   2824    2834   51463  12021     99.3    1.280
-03.3   94    58.50   2848    2881   52837  12094     99.5    1.264
-02.5   94    59.00   2871    2929   54247  12164     99.6    1.249
-01.7   95    59.50   2895    2977   55695  12230     99.7    1.234  ! Near Maximum !
-00.8   96    60.00   2918    3026   57180  12293     99.8    1.219  ! Near Maximum !
+00.0   97    60.50   2942    3074   58706  12351     99.9    1.204  ! Near Maximum !
+00.8   98    61.00   2965    3123   60271  12406     99.9    1.190  ! Near Maximum !
+01.7   98    61.50   2988    3172   61879  12456    100.0    1.175  ! Near Maximum !
+02.5   99    62.00   3011    3221   63530  12503    100.0    1.162  ! Near Maximum !
+03.3  100    62.50   3034    3270   65226  12547    100.0    1.148  !DANGEROUS LOAD-DO NOT USE!
+04.1  101    63.00   3057    3320   66968  12589    100.0    1.134  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     97    60.50   3008    3215   64621  12109    100.0    1.156  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     97    60.50   2861    2908   52856  12445     98.7    1.260

 

[longrangehunter]

Thanks for the QL data, very much appreciated.