280 AI and 140gr partition powder recommendations ?

[clambdin]

Got some 140 Partitons to play with in my 280 AI, I've never ran anything this light in the Ackley what powders would you guys recommend ?

 

[JD338]

62.0-63.0 grs of RL22 with the 140 gr PT should get you where you want to be.

JD338

 

[6mm Remington]

I used IMR7828SSC in my .280 AI with that very bullet. It worked well for me.

 

[MAinAR]

Up to 64.5 grains of H4831sc, very temperature stable. 3,190fps

 

[clambdin]

I'm out of RL22 at the moment but have plenty of the other two mentioned powders I will give them a try...I do have some MRP might try that in place of the RL22..

 

[jmad_81]

I had very good luck with RL-17 and the 140 BT and AB in my 280 AI. Might be worth a shot. Some of the best groups my gun has ever produced were with RL-17 and a 14 BT. I see no reason why it wouldn't work for the 140 PT as well.

 

[bboswell]

I'm shooting 150g NABLR but I had far greater success with Viht N165 than any other (including the 4831 SC I expected to use)

 

[clambdin]

Well I have RL17 and N165 so maybe I will try those also..how much of those powders are you guys using ?

 

[DrMike]

Suggestions:

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler PART SP 16325
Useable Case Capaci: 68.081 grain H2O = 4.420 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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   75    49.12   2608    2115   33301  10331     97.9    1.458
-18.0   76    50.35   2670    2216   35555  10572     98.6    1.420
-16.0   78    51.58   2731    2319   37956  10792     99.2    1.380
-14.0   80    52.80   2792    2424   40518  10989     99.6    1.338
-12.0   82    54.03   2853    2530   43255  11162     99.9    1.298
-10.0   84    55.26   2912    2636   46176  11309    100.0    1.259
-08.0   86    56.49   2971    2744   49297  11435    100.0    1.222
-06.0   88    57.72   3029    2853   52635  11556    100.0    1.186
-04.0   90    58.94   3087    2962   56201  11674    100.0    1.152  ! Near Maximum !
-02.0   91    60.17   3143    3072   60018  11789    100.0    1.119  ! Near Maximum !
+00.0   93    61.40   3200    3183   64062  11901    100.0    1.087  ! Near Maximum !
+02.0   95    62.63   3255    3294   68367  12009    100.0    1.057  !DANGEROUS LOAD-DO NOT USE!
+04.0   97    63.86   3311    3407   72958  12113    100.0    1.027  !DANGEROUS LOAD-DO NOT USE!
+06.0   99    65.08   3366    3521   77858  12214    100.0    0.999  !DANGEROUS LOAD-DO NOT USE!
+08.0  101    66.31   3420    3636   83090  12311    100.0    0.972  !DANGEROUS LOAD-DO NOT USE!
+10.0  103    67.54   3474    3753   88685  12405    100.0    0.946  !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     93    61.40   3303    3392   77211  11513    100.0    1.011  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     93    61.40   3041    2875   51449  12400     99.6    1.191

Cartridge          : .280 Ack Imp
Bullet             : .284, 140, Nosler PART SP 16325
Useable Case Capaci: 68.081 grain H2O = 4.420 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Vihtavuori N165

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   86    53.60   2471    1899   31564   9387     89.9    1.504
-18.0   89    54.94   2535    1998   33835   9689     91.3    1.463
-16.0   91    56.28   2600    2101   36279   9980     92.5    1.422
-14.0   93    57.62   2664    2207   38912  10259     93.7    1.377
-12.0   95    58.96   2729    2316   41750  10524     94.8    1.333
-10.0   97    60.30   2794    2427   44808  10773     95.8    1.290
-08.0   99    61.64   2859    2541   48075  11006     96.7    1.249
-06.0  101    62.98   2924    2658   51576  11221     97.5    1.209
-04.0  104    64.32   2989    2777   55348  11415     98.2    1.170  ! Near Maximum !
-02.0  106    65.66   3054    2899   59416  11589     98.8    1.133  ! Near Maximum !
+00.0  108    67.00   3118    3023   63808  11741     99.2    1.098  ! Near Maximum !
+02.0  110    68.34   3183    3149   68557  11868     99.6    1.063  !DANGEROUS LOAD-DO NOT USE!
+04.0  112    69.68   3247    3277   73700  11972     99.9    1.030  !DANGEROUS LOAD-DO NOT USE!
+06.0  114    71.02   3311    3408   79279  12048    100.0    0.997  !DANGEROUS LOAD-DO NOT USE!
+08.0  117    72.36   3374    3540   85343  12100    100.0    0.966  !DANGEROUS LOAD-DO NOT USE!
+10.0  119    73.70   3438    3674   91947  12142    100.0    0.936  !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    108    67.00   3254    3293   76719  11343    100.0    1.016  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba    108    67.00   2926    2662   51274  11545     94.2    1.205

 

[clambdin]

Thank's DrMike !

 

[clambdin]

MAinAR, 64.5 of H4831SC sounds like a lot in the 280 Ackley Have you ran that load ?

 

[jmad_81]

56 gr RL-17 with the 140 Bt gave me 3140 and groups in the .2-.3" range. Jumped up to 57 gr, .5-.6" groups and 3220 fps. I never really tweaked with it much after that, but it was shooting 2 in and one out. I know in this gun I could have gotten that tightened up with seating depth adjustments. I ended I taking a few deer and my Dad took a nice 4x5 bull elk with that load. Impressive results alll the way around!

I tried RL-17 with the 140 Ab and didn't have much luck, RL-22 shined there. I played around with RL-17 with the 150 ABLR as well. I got ok results (sub MOA) but nothing that excited me. Ended up settling on Rl-26 and a 168 ABLR doing 2940 into .3" groups.

I have also tried 4831SC with no luck. 7828 also has given me a few killer loads with anythign over a 150 gr bullet.

Best of luck to you!

 

[clambdin]

Well so far RL17 is winning the race..trouble is I'm running low on this powder, How is the lot to lot consistency of RL17 ?

 

[MAinAR]

MAinAR, 64.5 of H4831SC sounds like a lot in the 280 Ackley Have you ran that load ?

Yes very good load, magentospeed at 3,190fps single digit es's. .5 moa accuracy. very temperature stable. Best load yet in the longer barrel. Good barrel time.

Cartridge : .280 Ack Imp
Bullet : .284, 140, Nosler AccuBond 59992
Useable Case Capaci: 66.211 grain H2O = 4.299 cm³
Cartridge O.A.L. L6: 3.330 inch = 84.58 mm
Barrel Length : 27.0 inch = 685.8 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 80 49.60 2428 1832 27839 7685 83.5 1.676
-18.0 82 50.84 2490 1927 29706 7963 84.9 1.632
-16.0 84 52.08 2552 2025 31702 8237 86.4 1.589
-14.0 86 53.32 2615 2126 33838 8505 87.7 1.547
-12.0 88 54.56 2678 2230 36127 8767 89.0 1.507
-10.0 90 55.80 2742 2337 38579 9021 90.3 1.463
-08.0 92 57.04 2806 2448 41211 9267 91.5 1.419
-06.0 94 58.28 2870 2561 44034 9504 92.6 1.375
-04.0 96 59.52 2935 2678 47070 9731 93.7 1.334
-02.0 98 60.76 3000 2797 50335 9945 94.7 1.294
+00.0 100 62.00 3064 2919 53852 10148 95.6 1.255
+02.0 102 63.24 3129 3044 57645 10336 96.4 1.217 ! Near Maximum !
+04.0 105 64.48 3195 3172 61744 10510 97.2 1.181 ! Near Maximum !
+06.0 107 65.72 3260 3303 66175 10667 97.8 1.146 !DANGEROUS LOAD-DO NOT USE!
+08.0 109 66.96 3325 3437 70979 10808 98.4 1.111 !DANGEROUS LOAD-DO NOT USE!
+10.0 111 68.20 3390 3573 76190 10931 98.9 1.078 !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 100 62.00 3151 3086 59203 10245 98.0 1.205 ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba 100 62.00 2967 2736 48821 9927 92.2 1.310