280 Ackley SAAMI spec chamber pressure confusion...

[Ridgerunner665]

I hadn't even looked at the 168 ABLR...I think he's trying to tell me something, lol.

That makes for a pretty impressive set of numbers....168 ABLR at 2,850 - 2,900 fps....and well into "safe load" territory with MRP.

Edit: Matches up with the Z600 reticle great too... much better than the 150 ABLR.

 

[Ridgerunner665]

Brings up another question....

Mag box length...how much room does the Patriot have in the mag box?

 

[DrMike]

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 64.314 grain H2O = 4.176 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Norma MRP

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 50.72 2416 2073 31586 10402 92.8 1.579
-18.0 84 51.99 2480 2184 33850 10727 94.0 1.538
-16.0 86 53.26 2544 2299 36286 11036 95.2 1.497
-14.0 88 54.52 2608 2416 38909 11327 96.3 1.449
-12.0 90 55.79 2672 2536 41734 11597 97.2 1.402
-10.0 92 57.06 2736 2659 44780 11846 98.0 1.356
-08.0 94 58.33 2800 2785 48068 12071 98.7 1.312
-06.0 96 59.60 2864 2913 51620 12272 99.2 1.270
-04.0 98 60.86 2927 3044 55456 12446 99.6 1.229 ! Near Maximum !
-02.0 100 62.13 2990 3176 59616 12592 99.9 1.190 ! Near Maximum !
+00.0 102 63.40 3053 3311 64076 12709 100.0 1.152 ! Near Maximum !
+02.0 105 64.67 3115 3447 68883 12799 100.0 1.116 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 65.94 3176 3584 74078 12883 100.0 1.080 !DANGEROUS LOAD-DO NOT USE!
+06.0 109 67.20 3238 3724 79700 12962 100.0 1.047 !DANGEROUS LOAD-DO NOT USE!
+08.0 111 68.47 3298 3865 85794 13035 100.0 1.014 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 69.74 3359 4009 92413 13103 100.0 0.982 !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 63.40 3183 3600 78793 12175 100.0 1.061 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 63.40 2857 2901 50440 12797 96.4 1.274

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 64.314 grain H2O = 4.176 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : IMR 7828 SSC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 50.16 2388 2026 31975 9946 88.5 1.561
-18.0 84 51.41 2452 2136 34238 10289 90.0 1.519
-16.0 86 52.67 2516 2249 36658 10621 91.4 1.479
-14.0 89 53.92 2581 2366 39265 10940 92.7 1.429
-12.0 91 55.18 2646 2487 42065 11243 93.9 1.384
-10.0 93 56.43 2711 2610 45080 11530 95.0 1.339
-08.0 95 57.68 2776 2737 48329 11797 96.1 1.295
-06.0 97 58.94 2841 2868 51834 12045 97.0 1.254
-04.0 99 60.19 2906 3001 55622 12270 97.7 1.213 ! Near Maximum !
-02.0 101 61.45 2971 3137 59720 12472 98.4 1.175 ! Near Maximum !
+00.0 103 62.70 3037 3276 64157 12648 99.0 1.137 ! Near Maximum !
+02.0 105 63.95 3102 3418 68974 12797 99.4 1.101 !DANGEROUS LOAD-DO NOT USE!
+04.0 107 65.21 3166 3562 74212 12919 99.7 1.066 !DANGEROUS LOAD-DO NOT USE!
+06.0 109 66.46 3231 3709 79914 13010 99.9 1.032 !DANGEROUS LOAD-DO NOT USE!
+08.0 111 67.72 3295 3858 86139 13071 100.0 0.999 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 68.97 3359 4009 92948 13111 100.0 0.968 !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 103 62.70 3181 3596 78294 12203 100.0 1.049 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 103 62.70 2833 2852 51853 12344 93.0 1.251

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 64.314 grain H2O = 4.176 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Hodgdon H4831 SC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 82 49.04 2342 1949 32298 9221 88.2 1.565
-18.0 84 50.27 2402 2049 34533 9530 89.6 1.526
-16.0 86 51.49 2462 2153 36927 9830 90.8 1.486
-14.0 88 52.72 2522 2260 39492 10122 92.0 1.436
-12.0 90 53.94 2583 2370 42244 10404 93.2 1.392
-10.0 92 55.17 2644 2483 45199 10674 94.2 1.348
-08.0 94 56.40 2705 2599 48374 10931 95.2 1.306
-06.0 96 57.62 2766 2717 51789 11174 96.1 1.266
-04.0 98 58.85 2827 2839 55467 11401 96.9 1.227 ! Near Maximum !
-02.0 100 60.07 2888 2963 59430 11612 97.6 1.189 ! Near Maximum !
+00.0 102 61.30 2949 3090 63678 11805 98.2 1.152 ! Near Maximum !
+02.0 104 62.53 3010 3219 68249 11978 98.8 1.117 !DANGEROUS LOAD-DO NOT USE!
+04.0 106 63.75 3071 3352 73186 12132 99.2 1.083 !DANGEROUS LOAD-DO NOT USE!
+06.0 108 64.98 3133 3486 78526 12263 99.6 1.051 !DANGEROUS LOAD-DO NOT USE!
+08.0 110 66.20 3194 3623 84313 12372 99.8 1.019 !DANGEROUS LOAD-DO NOT USE!
+10.0 113 67.43 3254 3763 90596 12457 100.0 0.988 !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 61.30 3083 3377 75948 11580 100.0 1.070 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 102 61.30 2768 2723 51927 11432 92.3 1.259

Cartridge : .280 Ack Imp
Bullet : .284, 160, Nosler AccuBond 54932
Useable Case Capaci: 64.314 grain H2O = 4.176 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 64000 psi, or 441 MPa
or a maximum loading ratio or filling of 110 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

22 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Norma MRP 102.4 63.4 4.11 3052 100.0 64000 12707 1.153 ! Near Maximum !
Vihtavuori N560 104.2 63.1 4.09 3047 98.6 64000 13076 1.148 ! Near Maximum !
Accurate MAGPRO 104.5 65.8 4.27 3038 97.5 64000 13161 1.154 ! Near Maximum !
Alliant Reloder-25 110.0 64.9 4.20 3037 100.0 62757 12181 1.152 ! Near Maximum !
IMR 7828 108.8 62.7 4.06 3034 99.0 64000 12642 1.138 ! Near Maximum !
IMR 7828 SSC 102.9 62.7 4.06 3034 99.0 64000 12642 1.138 ! Near Maximum !
Alliant Reloder-22 104.5 62.6 4.06 3023 99.6 64000 12551 1.154 ! Near Maximum !
Winchester WXR 107.3 62.9 4.08 3022 99.6 64000 12569 1.154 ! Near Maximum !
Ramshot Magnum 104.2 67.3 4.36 3004 99.9 64000 11966 1.146 ! Near Maximum !
Alliant Reloder-17 91.9 57.2 3.70 2985 100.0 64000 11190 1.156 ! Near Maximum !
Vihtavuori N570 110.0 68.8 4.46 2979 93.9 55925 13907 1.212 ! Near Maximum !
Alliant Reloder-19 101.3 60.0 3.89 2978 99.5 64000 11960 1.152 ! Near Maximum !
Ramshot Hunter 96.8 59.3 3.84 2969 100.0 64000 11515 1.159 ! Near Maximum !
Hodgdon H414 91.4 57.3 3.71 2968 100.0 64000 11572 1.161 ! Near Maximum !
Winchester 760 91.4 57.3 3.71 2968 100.0 64000 11572 1.161 ! Near Maximum !
Norma MRP 2 110.0 65.2 4.23 2967 98.6 57717 12883 1.207 ! Near Maximum !
Norma 204 96.1 58.8 3.81 2954 99.4 64000 11655 1.153 ! Near Maximum !
Hodgdon H4831 SC 102.4 61.4 3.98 2954 98.3 64000 11818 1.150 ! Near Maximum !
Hodgdon H4831 106.6 61.4 3.98 2954 98.3 64000 11818 1.150 ! Near Maximum !
Alliant Reloder-33 110.0 71.7 4.64 2952 94.0 55241 13706 1.220
Vihtavuori N550 93.6 56.7 3.67 2946 100.0 64000 11155 1.170 ! Near Maximum !
Norma URP 96.3 56.5 3.66 2945 100.0 64000 11013 1.166 ! Near Maximum !
Accurate 4350 95.4 56.6 3.67 2940 100.0 64000 10964 1.183 ! Near Maximum !
Winchester Supreme 780 99.8 62.4 4.04 2930 99.4 64000 11358 1.158 ! Near Maximum !
IMR 4831 101.1 57.4 3.72 2926 100.0 64000 10771 1.175 ! Near Maximum !
Accurate 3100 104.5 62.0 4.02 2925 100.0 64000 11033 1.186 ! Near Maximum !
Vihtavuori N165 106.7 62.6 4.06 2925 99.7 64000 11142 1.163 ! Near Maximum !
Hodgdon H4350 98.8 57.3 3.71 2915 99.8 64000 10999 1.158 ! Near Maximum !
IMR 4350 97.0 57.2 3.71 2914 99.9 64000 10974 1.158 ! Near Maximum !
Hodgdon H1000 110.0 64.5 4.18 2910 98.1 57261 12081 1.194 ! Near Maximum !
Vihtavuori N160 106.8 60.7 3.93 2909 98.7 64000 11178 1.158 ! Near Maximum !
Hodgdon Hybrid 100V 98.9 56.7 3.67 2900 100.0 64000 10152 1.168 ! Near Maximum !
IMR 4007 SSC 91.1 54.8 3.55 2895 99.8 64000 10842 1.167 ! Near Maximum !
Accurate 2700 91.2 56.4 3.66 2849 99.8 64000 10253 1.171 ! Near Maximum !

 

[Ridgerunner665]

Thanks DrMike...the 168's look pretty good compared to the 160.

There is no wrong choice I guess...The more think about it, the more I'm liking the 168.

Makes better use of the slower powders... same speed, less compression.

 

[DrMike]

I like the ABLR. I shot the 150 grain ABLR in my .280 this past fall. It accounted for a nice mule deer and a superb bull elk. Both were one-shot kills.

 

[Ridgerunner665]

I looked at the 150 ABLR early on...and it looks very good by the numbers...but due to the velocity of the 280 AI, and the really good BC...It just doesn't match up very well with the Z600 reticle I have....It goes 300, 400, 515, 625...which I guess is just fine really, not hard to remember, but I wanted a heavier bullet.

I've always tried to use the middleweight bullet for a given caliber...the 168 is leaning towards the heavy end, but I still may roll with it.

 

[DrMike]

The 168 ABLR will work very well in the 280 AI.

 

[SJB358]

That 168 in the 280 Ackley would work for just about everything. What a shooting combo!

Can't argue with the speeds your getting from a 280 Ackely either, just behind my 7mm WSM...

 

[Ridgerunner665]

That 168 in the 280 Ackley would work for just about everything. What a shooting combo!

Can't argue with the speeds your getting from a 280 Ackely either, just behind my 7mm WSM...

That bullet weight always served me well in .308 caliber...they can only be better in .284 caliber.

Same velocity, MUCH better BC...

I "hope" the speeds are attainable...load data for the 280AI isn't very consistent.

From what I'm seeing...there is no optimal powder for this round (such as 4350 for the 30-06)...never realized that before now...online gossip about loading for it is plentiful, and I take that gossip with a grain of salt, but I do look for trends (with a hint of proof)...and the only trend I see is Reloder 22.

But I know RL22 well, used it for a good number of years in 300WM, its good for speed, and its good for 0-300 yard accuracy...its also good for locking up bolts, blowing primers, and ruining brass...I don't often shoot stuff when its 90 degrees outside, but if I do decide to...I don't want to be tearing stuff up.

I think I'm gonna take my chances with Ramshot Magnum and 168 ABLR's...the Magnum may not be any better than RL22, never used it....but I gotta start somewhere.

 

[SJB358]

If you don't like RL22, I'd really look hard at 7828SSC. To me, in my use, it has been nearly the same, grain for grain with RL22. Next up would be MRP. I believe MRP might keep a little tighter lot to lot consistency, but I don't know that for a fact. What I have been using so far has worked real nice though.

 

[PJGunner]

"I don't often shoot stuff when its 90 degrees outside, but if I do decide to...I don't want to be tearing stuff up."

I don't have much choice. Most of the year I have to get to the range at 7 AM when it opens amd by mid August have to be done by 9AM as it will be close to or past 90 degrees by then. Started noticing it last year but shooting over 100 degrees isn't much fun anymore. Guess I must be getting old. I have a fairly speedy load for my .280 Rem. but it was worked up at around 80 degrees with IMR 7828SSC. Still have to tweak for accuracy. Biggest problem is finding more powder. The 150 gr. ABLRs have completely vanished. Talked to the guy that does the stocking of the components yesterday and he said he hasn't seen any 150 gr. ABLRs since last November. Miracles of miracle, they actually had three pounds of Re22 on the shelf. :shock: Limit two pounds. I almost bought it but from what I've been hearing about it's temp sensitivity I passed. Dunno if that was mistake or not. Oh well. :roll: Where I've been elk hunting it's been anywhere from around 45 to 50 degrees and down the at or slightly below freezing. For deer again at or near freezing to as high as 75 to 80 degrees depending on where I draw for that hunt.
Paul B.