boomer68
Handloader
- Oct 23, 2006
- 862
- 59
Thinking of picking up some ABs to try initially in my new Accumark and was wondering would RL25 or 7828 be the best powders to start with? It's been a few years since I loaded for the 257.
Accubond in 257 Wby
- Thread starter boomer68
- Start date
DrMike
Ballistician
- Nov 8, 2006
- 37,545
- 6,624
Velocities at maximum charge are so similar as to be indistinguishable. You'll need to use a heavier charge of RL25 which will add a measure of recoil and give you slightly less cartridges per pound. Better? I really am not prepared to predict which will perform better for you. Either looks good.
Cartridge : .257 Weath. Mag
Bullet : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 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 75 54.16 2701 1782 32207 12413 89.8 1.508
-18.0 77 55.51 2771 1875 34418 12834 91.3 1.472
-16.0 78 56.87 2841 1971 36784 13240 92.6 1.436
-14.0 80 58.22 2911 2070 39310 13629 93.9 1.390
-12.0 82 59.58 2981 2171 42012 13998 95.0 1.346
-10.0 84 60.93 3052 2275 44904 14347 96.1 1.304
-08.0 86 62.28 3122 2381 47999 14672 97.0 1.264
-06.0 88 63.64 3192 2489 51312 14972 97.8 1.225
-04.0 90 64.99 3262 2599 54862 15245 98.5 1.187 ! Near Maximum !
-02.0 91 66.35 3331 2711 58629 15489 99.1 1.151 ! Near Maximum !
+00.0 93 67.70 3401 2824 62642 15702 99.5 1.117 ! Near Maximum !
+02.0 95 69.05 3469 2940 66927 15882 99.8 1.083 !DANGEROUS LOAD-DO NOT USE!
+04.0 97 70.41 3537 3056 71508 16030 100.0 1.051 !DANGEROUS LOAD-DO NOT USE!
+06.0 99 71.76 3605 3174 76407 16142 100.0 1.020 !DANGEROUS LOAD-DO NOT USE!
+08.0 101 73.12 3672 3293 81653 16240 100.0 0.990 !DANGEROUS LOAD-DO NOT USE!
+10.0 103 74.47 3738 3412 87274 16332 100.0 0.961 !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 67.70 3555 3087 75229 15198 100.0 1.030 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 93 67.70 3182 2473 50486 15388 94.4 1.229
artridge : .257 Weath. Mag
Bullet : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-25
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 56.16 2722 1810 31908 12768 96.1 1.526
-18.0 82 57.56 2792 1904 34148 13124 97.2 1.489
-16.0 84 58.97 2862 2000 36546 13451 98.1 1.452
-14.0 86 60.37 2931 2098 39118 13746 98.8 1.406
-12.0 88 61.78 3000 2198 41875 14006 99.4 1.361
-10.0 90 63.18 3068 2300 44832 14229 99.8 1.318
-08.0 92 64.58 3136 2402 48007 14415 100.0 1.276
-06.0 94 65.99 3203 2506 51417 14564 100.0 1.237
-04.0 96 67.39 3269 2610 55076 14703 100.0 1.198 ! Near Maximum !
-02.0 98 68.80 3334 2715 58965 14839 100.0 1.161 ! Near Maximum !
+00.0 100 70.20 3398 2821 63110 14971 100.0 1.126 ! Near Maximum !
+02.0 102 71.60 3462 2927 67535 15098 100.0 1.092 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 73.01 3525 3035 72265 15221 100.0 1.059 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 74.41 3587 3143 77322 15340 100.0 1.028 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 75.82 3649 3253 82735 15453 100.0 0.998 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 77.22 3711 3364 88535 15562 100.0 0.969 !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 70.20 3528 3040 76718 14494 100.0 1.038 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 70.20 3200 2502 50005 15477 99.1 1.245
Cartridge : .257 Weath. Mag
Bullet : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 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 75 54.16 2701 1782 32207 12413 89.8 1.508
-18.0 77 55.51 2771 1875 34418 12834 91.3 1.472
-16.0 78 56.87 2841 1971 36784 13240 92.6 1.436
-14.0 80 58.22 2911 2070 39310 13629 93.9 1.390
-12.0 82 59.58 2981 2171 42012 13998 95.0 1.346
-10.0 84 60.93 3052 2275 44904 14347 96.1 1.304
-08.0 86 62.28 3122 2381 47999 14672 97.0 1.264
-06.0 88 63.64 3192 2489 51312 14972 97.8 1.225
-04.0 90 64.99 3262 2599 54862 15245 98.5 1.187 ! Near Maximum !
-02.0 91 66.35 3331 2711 58629 15489 99.1 1.151 ! Near Maximum !
+00.0 93 67.70 3401 2824 62642 15702 99.5 1.117 ! Near Maximum !
+02.0 95 69.05 3469 2940 66927 15882 99.8 1.083 !DANGEROUS LOAD-DO NOT USE!
+04.0 97 70.41 3537 3056 71508 16030 100.0 1.051 !DANGEROUS LOAD-DO NOT USE!
+06.0 99 71.76 3605 3174 76407 16142 100.0 1.020 !DANGEROUS LOAD-DO NOT USE!
+08.0 101 73.12 3672 3293 81653 16240 100.0 0.990 !DANGEROUS LOAD-DO NOT USE!
+10.0 103 74.47 3738 3412 87274 16332 100.0 0.961 !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 67.70 3555 3087 75229 15198 100.0 1.030 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 93 67.70 3182 2473 50486 15388 94.4 1.229
artridge : .257 Weath. Mag
Bullet : .257, 110, Nosler AccuBond 53742
Useable Case Capaci: 76.606 grain H2O = 4.974 cm³
Cartridge O.A.L. L6: 3.170 inch = 80.52 mm
Barrel Length : 24.0 inch = 609.6 mm
Powder : Alliant Reloder-25
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 56.16 2722 1810 31908 12768 96.1 1.526
-18.0 82 57.56 2792 1904 34148 13124 97.2 1.489
-16.0 84 58.97 2862 2000 36546 13451 98.1 1.452
-14.0 86 60.37 2931 2098 39118 13746 98.8 1.406
-12.0 88 61.78 3000 2198 41875 14006 99.4 1.361
-10.0 90 63.18 3068 2300 44832 14229 99.8 1.318
-08.0 92 64.58 3136 2402 48007 14415 100.0 1.276
-06.0 94 65.99 3203 2506 51417 14564 100.0 1.237
-04.0 96 67.39 3269 2610 55076 14703 100.0 1.198 ! Near Maximum !
-02.0 98 68.80 3334 2715 58965 14839 100.0 1.161 ! Near Maximum !
+00.0 100 70.20 3398 2821 63110 14971 100.0 1.126 ! Near Maximum !
+02.0 102 71.60 3462 2927 67535 15098 100.0 1.092 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 73.01 3525 3035 72265 15221 100.0 1.059 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 74.41 3587 3143 77322 15340 100.0 1.028 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 75.82 3649 3253 82735 15453 100.0 0.998 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 77.22 3711 3364 88535 15562 100.0 0.969 !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 70.20 3528 3040 76718 14494 100.0 1.038 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 100 70.20 3200 2502 50005 15477 99.1 1.245
Divernhunter
Handloader
- Apr 1, 2009
- 812
- 172
In "MY" Vangard I got better accuracy with the RL25. Accuracy was good with the IMR7828 but the RL was a bit better. Both were max loads.
rodell
Handloader
- Dec 23, 2013
- 269
- 0
I exclusively use 7828SSC and have no complaints.
Horsethief
Handloader
- Jul 5, 2012
- 346
- 5
If you're wondering about RL-22 and the 110gn AB, I found 68.5gn of the -22 powder with Fed 215 primers pushing the 110ABs made a really tight group @ 100yds. My 257 Roy likes the bullets seated to the longest length that will fit in the magazine so I've never had to work COL to shorter lengths to find the "sweet spot" of accuracy. Call it lucky.
- Thread starter
- #8
boomer68
Handloader
- Oct 23, 2006
- 862
- 59
Thanks FOTIS. What was your OAL and what charge did you start at?
