Load Specifications
Bullet Manufacturer:North Fork
Bullet Weight:270 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:1:6.0
Load data in caliber .375 Weath. Mag. with .375 | 270gr | NorthFork Bonded Core bullet and 105 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 60 and Alliant Reloder-17.
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>> | 86% | 55,941 psi | 88% | 2575 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,244 psi | 85% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 57,740 psi | 90% | 2641 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,101 psi | 88% | 2661 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 57,217 psi | 90% | 2641 fps | 97% |
| Accurate 4064 | <<locked>> | 94% | 57,479 psi | 90% | 2684 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2713 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 54,766 psi | 86% | 2667 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 55,811 psi | 87% | 2667 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 57,334 psi | 90% | 2671 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,418 psi | 85% | 2602 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,927 psi | 88% | 2726 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,157 psi | 85% | 2779 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,593 psi | 87% | 2690 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,535 psi | 87% | 2575 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,289 psi | 88% | 2710 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,561 psi | 81% | 2713 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,231 psi | 88% | 2805 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,608 psi | 57% | 2461 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,567 psi | 64% | 2602 fps | 96.7% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 57,261 psi | 90% | 2559 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,563 psi | 86% | 2684 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 56,014 psi | 88% | 2703 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,420 psi | 88% | 2671 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,767 psi | 87% | 2608 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,681 psi | 89% | 2703 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,839 psi | 86% | 2743 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 54,607 psi | 86% | 2618 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,579 psi | 87% | 2644 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 57,377 psi | 90% | 2717 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2759 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 57,319 psi | 90% | 2723 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 55,303 psi | 87% | 2677 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2598 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,433 psi | 85% | 2710 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 57,580 psi | 90% | 2799 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 55% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,608 psi | 89% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,114 psi | 86% | 2661 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,288 psi | 87% | 2651 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,593 psi | 87% | 2635 fps | 97.6% |
| IMR 4198 | <<locked>> | 82% | 55,651 psi | 87% | 2536 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,837 psi | 83% | 2641 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,940 psi | 86% | 2654 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,502 psi | 79% | 2654 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 57,696 psi | 90% | 2740 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 57,334 psi | 90% | 2671 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,041 psi | 85% | 2612 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,288 psi | 85% | 2648 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,665 psi | 86% | 2602 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 55,056 psi | 86% | 2651 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2694 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2677 fps | 97.7% |
| Norma 201 | <<locked>> | 90% | 57,072 psi | 89% | 2667 fps | 100% |
| Norma 202 | <<locked>> | 90% | 57,609 psi | 90% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,434 psi | 87% | 2700 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,446 psi | 82% | 2700 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 55,970 psi | 88% | 2723 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2694 fps | 97.8% |
| Ramshot TAC | <<locked>> | 86% | 54,317 psi | 85% | 2641 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 57,276 psi | 90% | 2710 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,955 psi | 86% | 2628 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,694 psi | 56% | 1637 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,942 psi | 89% | 2651 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 57,740 psi | 90% | 2700 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,550 psi | 89% | 2772 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,115 psi | 88% | 2808 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 2733 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,055 psi | 83% | 2756 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 54,708 psi | 86% | 2602 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 57,406 psi | 90% | 2661 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,869 psi | 88% | 2694 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,420 psi | 88% | 2671 fps | 97.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2694 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,288 psi | 85% | 2648 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,056 psi | 86% | 2651 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2677 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,681 psi | 89% | 2628 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,041 psi | 85% | 2703 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,405 psi | 88% | 2598 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,115 psi | 88% | 2671 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,579 psi | 89% | 2690 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,317 psi | 87% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,361 psi | 87% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,447 psi | 85% | 2602 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 55,158 psi | 86% | 2657 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,650 psi | 86% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,738 psi | 87% | 2664 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 56,130 psi | 88% | 2690 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2651 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,259 psi | 87% | 2530 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,448 psi | 87% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,942 psi | 89% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,621 psi | 86% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,273 psi | 85% | 2628 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 2697 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 54,505 psi | 85% | 2625 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,115 psi | 88% | 2644 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 2703 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,552 psi | 62% | 2533 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2684 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,157 psi | 85% | 2671 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 2762 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,677 psi | 51% | 2441 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 56,463 psi | 88% | 2700 fps | 100% |
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% | 46,485 psi | 73% | 2448 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,734 psi | 80% | 2552 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,073 psi | 61% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,876 psi | 72% | 2516 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 50,241 psi | 79% | 2539 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 36,912 psi | 58% | 2369 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 35,157 psi | 55% | 2395 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,656 psi | 67% | 2470 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,332 psi | 57% | 2333 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,701 psi | 70% | 2480 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 44,744 psi | 70% | 2474 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,243 psi | 82% | 2671 fps | 99.9% |
| Alliant Power Pro 2000-MR | 69.3 gr | 80% | 38,667 psi | 61% | 2493 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,868 psi | 56% | 2356 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,315 psi | 82% | 2536 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,464 psi | 60% | 2411 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,766 psi | 56% | 2408 fps | 95.8% |
| Alliant Reloder-17 | 68.2 gr | 80% | 30,850 psi | 48% | 2313 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,647 psi | 48% | 2313 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,797 psi | 59% | 2539 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,867 psi | 84% | 2516 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,785 psi | 65% | 2477 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 35,244 psi | 55% | 2352 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 46,862 psi | 73% | 2523 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,514 psi | 73% | 2474 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,395 psi | 68% | 2503 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,688 psi | 75% | 2635 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 51,256 psi | 80% | 2572 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,054 psi | 82% | 2595 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,172 psi | 57% | 2356 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 92% | 43,265 psi | 68% | 2546 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 50,502 psi | 79% | 2621 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 43,062 psi | 67% | 2484 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,690 psi | 48% | 2260 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,914 psi | 61% | 2454 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 94% | 46,485 psi | 73% | 2621 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 41% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,365 psi | 65% | 2438 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 42,525 psi | 67% | 2480 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,130 psi | 60% | 2365 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 46,195 psi | 72% | 2484 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,431 psi | 82% | 2497 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,731 psi | 73% | 2546 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,861 psi | 72% | 2507 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 34,200 psi | 54% | 2356 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,392 psi | 62% | 2438 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 44,701 psi | 70% | 2480 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 50,575 psi | 79% | 2562 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,611 psi | 65% | 2454 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 43,062 psi | 67% | 2418 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 38,087 psi | 60% | 2372 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 39,929 psi | 63% | 2408 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 42,830 psi | 67% | 2480 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 41,887 psi | 66% | 2431 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 42,134 psi | 66% | 2441 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,855 psi | 59% | 2398 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 35,708 psi | 56% | 2398 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,333 psi | 59% | 2411 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 42,308 psi | 66% | 2536 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 44,585 psi | 70% | 2484 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,019 psi | 69% | 2503 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,254 psi | 76% | 2526 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 42% | 1463 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,140 psi | 79% | 2559 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,785 psi | 65% | 2444 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,190 psi | 63% | 2503 fps | 97.8% |
| ReloadSwiss RS 60 | 68.2 gr | 80% | 32,822 psi | 51% | 2379 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,085 psi | 55% | 2411 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,840 psi | 59% | 2470 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 45,890 psi | 72% | 2470 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,885 psi | 63% | 2385 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 33,228 psi | 52% | 2303 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 46,862 psi | 73% | 2523 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,929 psi | 63% | 2408 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,611 psi | 65% | 2454 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,087 psi | 60% | 2372 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 42,830 psi | 67% | 2480 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 53,069 psi | 83% | 2579 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,258 psi | 54% | 2349 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 53,098 psi | 83% | 2556 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,873 psi | 67% | 2461 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,292 psi | 65% | 2444 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,352 psi | 68% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,926 psi | 56% | 2267 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,860 psi | 70% | 2457 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 48,298 psi | 76% | 2556 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,873 psi | 67% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,569 psi | 67% | 2461 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 34,185 psi | 54% | 2310 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 26,368 psi | 41% | 2195 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,965 psi | 77% | 2448 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,598 psi | 68% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,204 psi | 61% | 2372 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,827 psi | 62% | 2379 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,430 psi | 51% | 2254 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 34,998 psi | 55% | 2349 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,730 psi | 70% | 2477 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,261 psi | 60% | 2369 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,666 psi | 57% | 2402 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 32,619 psi | 51% | 2382 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,777 psi | 48% | 2228 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 44,295 psi | 69% | 2520 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 43,468 psi | 68% | 2549 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,748 psi | 48% | 2382 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,625 psi | 64% | 2448 fps | 98.8% |
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 105 powders for .375 Weath. Mag. loaded with the .375 | 270gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,808 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-23 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 60, Alliant Reloder-17 rank at the top here: for .375 Weath. Mag. with the .375 | 270gr | NorthFork Bonded Core 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.