Home Forums Reloading Reloading Software Quick Quickload run for 375 h&h

Not sure this is the right place to post this, but...

So I can't get RL 15 and one powder I am considering as a substitute is Norma 203b. Could anyone run a quickload simulation and tell me what Min and max loads and velocities and pressures would be?

I am running a 260 gf accubond out of a 25" barrel 375 h&h, using federal brass and Winchester magnum primers.

I also heard that QL will offer suggestions on other substitute powders...ie something like RL15?

Thanks!

Better late than never, the new version 3.8 just showed up finally. I took .010 off the max COL to run these numbers for a length of 3.590

Cartridge : .375 H.& H. Mag.
Bullet : .375, 260, Nosler AccuBond 54413
Useable Case Capaci: 77.487 grain H2O = 5.031 cm�
Cartridge O.A.L. L6: 3.590 inch = 91.19 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : Norma 203B

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 57.36 2293 3035 33019 6703 94.9 1.538
-18.0 82 58.79 2346 3177 35186 6879 95.8 1.497
-16.0 84 60.23 2398 3321 37489 7047 96.6 1.456
-14.0 86 61.66 2451 3468 39937 7206 97.3 1.414
-12.0 88 63.10 2503 3617 42540 7355 97.9 1.373
-10.0 90 64.53 2555 3769 45307 7494 98.5 1.334
-08.0 92 65.96 2607 3923 48250 7623 98.9 1.297
-06.0 94 67.40 2658 4079 51381 7741 99.3 1.261
-04.0 96 68.83 2709 4236 54715 7847 99.6 1.226 ! Near Maximum !
-02.0 98 70.27 2759 4396 58265 7941 99.8 1.193 ! Near Maximum !
+00.0 100 71.70 2809 4557 62049 8022 100.0 1.161 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 73.13 2859 4719 66085 8091 100.0 1.130 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 74.57 2908 4883 70395 8151 100.0 1.100 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 76.00 2957 5048 75000 8209 100.0 1.071 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 77.44 3005 5215 79927 8265 100.0 1.044 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 78.87 3054 5383 85204 8318 100.0 1.017 !DANGEROUS LOAD-DO NOT USE!

Same load substituting RL-15

Cartridge : .375 H.& H. Mag.
Bullet : .375, 260, Nosler AccuBond 54413
Useable Case Capaci: 77.487 grain H2O = 5.031 cm�
Cartridge O.A.L. L6: 3.590 inch = 91.19 mm
Barrel Length : 25.0 inch = 635.0 mm
Powder : Alliant Reloder-15

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 57.12 2293 3037 33236 6701 94.2 1.534
-18.0 82 58.55 2347 3179 35405 6881 95.1 1.493
-16.0 84 59.98 2399 3324 37710 7053 96.0 1.452
-14.0 86 61.40 2452 3471 40159 7216 96.7 1.410
-12.0 88 62.83 2504 3621 42761 7371 97.4 1.370
-10.0 90 64.26 2556 3773 45527 7515 98.0 1.331
-08.0 92 65.69 2608 3927 48466 7650 98.6 1.294
-06.0 94 67.12 2660 4084 51592 7774 99.0 1.258
-04.0 96 68.54 2711 4242 54918 7887 99.4 1.224 ! Near Maximum !
-02.0 98 69.97 2762 4403 58458 7989 99.6 1.191 ! Near Maximum !
+00.0 100 71.40 2812 4565 62230 8078 99.8 1.159 !DANGEROUS LOAD-DO NOT USE!
+02.0 102 72.83 2862 4729 66251 8155 100.0 1.128 !DANGEROUS LOAD-DO NOT USE!
+04.0 104 74.26 2911 4894 70541 8220 100.0 1.099 !DANGEROUS LOAD-DO NOT USE!
+06.0 106 75.68 2961 5060 75123 8276 100.0 1.070 !DANGEROUS LOAD-DO NOT USE!
+08.0 108 77.11 3009 5228 80022 8330 100.0 1.042 !DANGEROUS LOAD-DO NOT USE!
+10.0 110 78.54 3058 5398 85266 8382 100.0 1.016 !DANGEROUS LOAD-DO NOT USE!

I use IMR 4064 in my .375 H&H using either the Nosler 260 gr.accubonds or my favorite, Barnes X 235 gr. bullets. Works great in my Winchester model 70. IMR 4064 is the most accurate powder that I've tried, and I've tried a lot over the years.