Load Specifications
Bullet:.375 | 256gr | Sologne GPA
Bullet Manufacturer:Sologne
Bullet Weight:256 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Weath. Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:105 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:16.5
Load data in caliber .375 Weath. Mag. with .375 | 256gr | Sologne GPA bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, ReloadSwiss RS 52 and ReloadSwiss RS 60.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 55,056 psi | 86% | 2621 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 57,145 psi | 90% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,173 psi | 88% | 2684 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 54,984 psi | 86% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 56,724 psi | 89% | 2674 fps | 95.9% |
| Accurate 4064 | <<locked>> | 96% | 55,695 psi | 87% | 2723 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,834 psi | 75% | 2684 fps | 98% |
| Accurate LT-30 | <<locked>> | 82% | 54,476 psi | 85% | 2569 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,897 psi | 86% | 2592 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 57,450 psi | 90% | 2759 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 54,839 psi | 86% | 2703 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 55,317 psi | 87% | 2684 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 56,594 psi | 89% | 2713 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 56,666 psi | 89% | 2694 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 54,955 psi | 86% | 2769 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 57,087 psi | 89% | 2867 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 57,566 psi | 90% | 2772 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 54,795 psi | 86% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,172 psi | 86% | 2746 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,282 psi | 74% | 2687 fps | 98.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2835 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 57,000 psi | 89% | 2612 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 57,319 psi | 90% | 2776 fps | 99.3% |
| Bofors RP3 | <<locked>> | 96% | 54,534 psi | 85% | 2736 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2700 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,332 psi | 87% | 2654 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,593 psi | 87% | 2743 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 57,696 psi | 90% | 2838 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 86% | 57,435 psi | 90% | 2713 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 54,868 psi | 86% | 2690 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,246 psi | 88% | 2753 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 2733 fps | 96% |
| Hodgdon H4895 | <<locked>> | 90% | 54,418 psi | 85% | 2720 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2575 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 56,681 psi | 89% | 2795 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,780 psi | 55% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,941 psi | 88% | 2723 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 57,450 psi | 90% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 57,740 psi | 90% | 2736 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,027 psi | 86% | 2667 fps | 96.5% |
| IMR 4198 | <<locked>> | 84% | 55,259 psi | 87% | 2589 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 57,479 psi | 90% | 2733 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,484 psi | 71% | 2625 fps | 97.6% |
| IMR 4895 | <<locked>> | 94% | 56,536 psi | 89% | 2776 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 56,594 psi | 89% | 2713 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 57,014 psi | 89% | 2703 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 56,782 psi | 89% | 2736 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 57,566 psi | 90% | 2690 fps | 99.8% |
| Lovex S062 | <<locked>> | 96% | 57,290 psi | 90% | 2733 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 52,968 psi | 83% | 2677 fps | 97.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,212 psi | 79% | 2654 fps | 95.9% |
| Norma 201 | <<locked>> | 92% | 55,985 psi | 88% | 2703 fps | 100% |
| Norma 202 | <<locked>> | 92% | 56,463 psi | 88% | 2710 fps | 100% |
| Norma 203B | <<locked>> | 96% | 57,682 psi | 90% | 2782 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2674 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 94% | 54,708 psi | 86% | 2759 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2664 fps | 95.8% |
| Ramshot TAC | <<locked>> | 90% | 57,203 psi | 90% | 2730 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,579 psi | 89% | 2753 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,346 psi | 85% | 2667 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,114 psi | 55% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 56,362 psi | 88% | 2700 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 56,652 psi | 89% | 2730 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,013 psi | 86% | 2805 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,563 psi | 86% | 2841 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,456 psi | 74% | 2700 fps | 97.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2720 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 90% | 57,130 psi | 90% | 2690 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 56,434 psi | 88% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,389 psi | 85% | 2730 fps | 99.8% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,405 psi | 87% | 2700 fps | 96% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 52,968 psi | 83% | 2677 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 92% | 56,782 psi | 89% | 2736 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 57,290 psi | 90% | 2733 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,212 psi | 79% | 2654 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,289 psi | 88% | 2674 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,651 psi | 87% | 2697 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,275 psi | 88% | 2789 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 55,854 psi | 88% | 2648 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,419 psi | 87% | 2707 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,680 psi | 87% | 2730 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 54,810 psi | 86% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,578 psi | 86% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2631 fps | 96.2% |
| Somchem S321 | <<locked>> | 86% | 54,389 psi | 85% | 2700 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 57,130 psi | 90% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,795 psi | 86% | 2700 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 54,839 psi | 86% | 2726 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,380 psi | 66% | 2625 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 86% | 54,766 psi | 86% | 2579 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,810 psi | 86% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,724 psi | 87% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 57,145 psi | 90% | 2690 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,565 psi | 89% | 2710 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2677 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 90% | 57,377 psi | 90% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,230 psi | 87% | 2687 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2680 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,213 psi | 80% | 2664 fps | 99.6% |
| Winchester 748 | <<locked>> | 90% | 56,623 psi | 89% | 2759 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,517 psi | 81% | 2733 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,463 psi | 87% | 2740 fps | 99.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,018 psi | 67% | 2451 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,833 psi | 73% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,592 psi | 56% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,843 psi | 66% | 2503 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 52,997 psi | 83% | 2621 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 33,649 psi | 53% | 2352 fps | 99.3% |
| Accurate 4350 | <<locked>> | 94% | 38,827 psi | 61% | 2520 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 51,300 psi | 80% | 2526 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,663 psi | 81% | 2546 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,436 psi | 62% | 2457 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 35,810 psi | 56% | 2365 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 51,764 psi | 81% | 2638 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,452 psi | 65% | 2470 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 40,799 psi | 64% | 2474 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,037 psi | 75% | 2661 fps | 99.3% |
| Alliant Power Pro 2000-MR | 68.3 gr | 82% | 38,087 psi | 60% | 2520 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,764 psi | 51% | 2333 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,617 psi | 76% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,346 psi | 55% | 2388 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,115 psi | 58% | 2477 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,314 psi | 51% | 2392 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,357 psi | 79% | 2523 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,377 psi | 60% | 2454 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 32,082 psi | 50% | 2329 fps | 96.1% |
| Bofors RP7 | <<locked>> | 98% | 52,098 psi | 82% | 2651 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,555 psi | 68% | 2470 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,682 psi | 62% | 2487 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,627 psi | 68% | 2612 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 47,442 psi | 74% | 2572 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,051 psi | 75% | 2592 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,495 psi | 63% | 2490 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 98% | 48,066 psi | 75% | 2677 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 39,769 psi | 62% | 2470 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,763 psi | 50% | 2326 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,607 psi | 56% | 2431 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,962 psi | 41% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,261 psi | 60% | 2425 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 38,812 psi | 61% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,259 psi | 55% | 2346 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,733 psi | 76% | 2569 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,153 psi | 77% | 2510 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 50,836 psi | 80% | 2635 fps | 95.6% |
| IMR 4831 | <<locked>> | 94% | 37,507 psi | 59% | 2477 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,172 psi | 57% | 2418 fps | 96.4% |
| IMR 8208 XBR | <<locked>> | 80% | 41,452 psi | 65% | 2470 fps | 98.8% |
| Lovex D073.5 | <<locked>> | 80% | 46,557 psi | 73% | 2556 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 37,913 psi | 59% | 2438 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 40,059 psi | 63% | 2405 fps | 97.4% |
| Lovex S062 | <<locked>> | 80% | 34,969 psi | 55% | 2352 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 44,150 psi | 69% | 2533 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 47,282 psi | 74% | 2605 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 38,783 psi | 61% | 2418 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 38,798 psi | 61% | 2431 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 34,737 psi | 54% | 2379 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 39,334 psi | 62% | 2520 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 34,171 psi | 54% | 2385 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 98% | 44,005 psi | 69% | 2608 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 41,336 psi | 65% | 2467 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,480 psi | 63% | 2487 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 44,846 psi | 70% | 2516 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,179 psi | 41% | 1483 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,470 psi | 73% | 2552 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 46,818 psi | 73% | 2575 fps | 95.5% |
| ReloadSwiss RS 52 | 64.6 gr | 80% | 36,506 psi | 57% | 2477 fps | 95.8% |
| ReloadSwiss RS 60 | 65.6 gr | 80% | 30,226 psi | 47% | 2346 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,769 psi | 61% | 2536 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,322 psi | 66% | 2602 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 42,554 psi | 67% | 2467 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 36,912 psi | 58% | 2372 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 32,285 psi | 51% | 2329 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 98% | 52,098 psi | 82% | 2651 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,150 psi | 69% | 2533 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 37,913 psi | 59% | 2438 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 34,969 psi | 55% | 2352 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 47,282 psi | 74% | 2605 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,197 psi | 77% | 2569 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,069 psi | 82% | 2644 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,475 psi | 52% | 2375 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,284 psi | 77% | 2559 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,407 psi | 62% | 2438 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,058 psi | 60% | 2428 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,306 psi | 63% | 2385 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,185 psi | 52% | 2257 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,053 psi | 78% | 2582 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,570 psi | 70% | 2546 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 39,900 psi | 63% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,102 psi | 61% | 2441 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 31,372 psi | 49% | 2290 fps | 95.1% |
| Somchem S365 | <<locked>> | 88% | 29,008 psi | 45% | 2313 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 45,658 psi | 72% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,466 psi | 63% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 35,795 psi | 56% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,622 psi | 57% | 2369 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,617 psi | 46% | 2231 fps | 96.1% |
| Vihtavuori N160 | <<locked>> | 92% | 38,754 psi | 61% | 2474 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 41,423 psi | 65% | 2467 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 35,317 psi | 55% | 2359 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 38,000 psi | 60% | 2474 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,314 psi | 51% | 2303 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 40,379 psi | 63% | 2507 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 48,240 psi | 76% | 2680 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,159 psi | 58% | 2428 fps | 97.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 102 powders for .375 Weath. Mag. loaded with the .375 | 256gr | Sologne GPA. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,867 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,867 fps. Accurate 4350 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 256.0 gr projectile in 0.375" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Alliant Power Pro 2000-MR, ReloadSwiss RS 52, ReloadSwiss RS 60 rank at the top here: for .375 Weath. Mag. with the .375 | 256gr | Sologne GPA they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.