Load Specifications
Bullet Manufacturer:Barnes
Bullet Weight:255 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 H&H Mag. load data
Case Length (l3):2.859"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:95.3 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Load data in caliber .375 H&H Mag. with .375 | 255gr | Barnes Original FN FB bullet and 104 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 ReloadSwiss RS 52.
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% | 55,332 psi | 89% | 2621 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,780 psi | 86% | 2644 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,420 psi | 90% | 2680 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,635 psi | 86% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,635 psi | 86% | 2690 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 56,231 psi | 90% | 2723 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,153 psi | 77% | 2680 fps | 98% |
| Accurate LT-30 | <<locked>> | 82% | 54,882 psi | 88% | 2569 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,288 psi | 89% | 2592 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,346 psi | 87% | 2710 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 55,245 psi | 89% | 2703 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 55,593 psi | 89% | 2684 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,548 psi | 86% | 2667 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 53,621 psi | 86% | 2651 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,216 psi | 89% | 2766 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,722 psi | 86% | 2812 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,694 psi | 88% | 2726 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,230 psi | 89% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,405 psi | 89% | 2743 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,645 psi | 76% | 2687 fps | 98.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,259 psi | 89% | 2838 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,882 psi | 86% | 2566 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,056 psi | 87% | 2723 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 54,998 psi | 88% | 2740 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2700 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,767 psi | 89% | 2654 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,028 psi | 90% | 2743 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,056 psi | 87% | 2782 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 86% | 53,519 psi | 86% | 2654 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,897 psi | 88% | 2687 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 52,881 psi | 85% | 2697 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 98% | 53,476 psi | 86% | 2759 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 90% | 54,839 psi | 88% | 2720 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,801 psi | 70% | 2575 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,359 psi | 86% | 2743 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,911 psi | 56% | 1621 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,839 psi | 88% | 2703 fps | 99.8% |
| IMR 3031 | <<locked>> | 94% | 55,796 psi | 89% | 2726 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,693 psi | 86% | 2674 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 96% | 53,722 psi | 86% | 2641 fps | 96.2% |
| IMR 4198 | <<locked>> | 84% | 55,463 psi | 89% | 2589 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,346 psi | 87% | 2680 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,857 psi | 66% | 2536 fps | 96.4% |
| IMR 4895 | <<locked>> | 92% | 53,447 psi | 86% | 2726 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 53,548 psi | 86% | 2667 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 84% | 56,202 psi | 90% | 2677 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,679 psi | 86% | 2654 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,417 psi | 86% | 2687 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,476 psi | 87% | 2641 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 54,157 psi | 87% | 2687 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,200 psi | 85% | 2674 fps | 97.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,647 psi | 81% | 2654 fps | 95.9% |
| Norma 201 | <<locked>> | 90% | 53,200 psi | 85% | 2661 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 53,403 psi | 86% | 2661 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,505 psi | 87% | 2733 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 48,022 psi | 77% | 2674 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 94% | 54,940 psi | 88% | 2756 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,253 psi | 76% | 2664 fps | 95.8% |
| Ramshot TAC | <<locked>> | 88% | 53,983 psi | 87% | 2677 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,113 psi | 85% | 2697 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,810 psi | 88% | 2667 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,244 psi | 57% | 1660 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,287 psi | 85% | 2651 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,592 psi | 86% | 2680 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,492 psi | 89% | 2808 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,056 psi | 88% | 2838 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,935 psi | 77% | 2700 fps | 97.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,747 psi | 78% | 2720 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 88% | 54,302 psi | 87% | 2648 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,548 psi | 86% | 2657 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 98% | 54,708 psi | 88% | 2726 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,796 psi | 89% | 2700 fps | 96% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,200 psi | 85% | 2674 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,417 psi | 86% | 2687 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,157 psi | 87% | 2687 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,647 psi | 81% | 2654 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 52,924 psi | 85% | 2621 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,883 psi | 90% | 2694 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 52,982 psi | 85% | 2736 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,072 psi | 90% | 2648 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,666 psi | 89% | 2707 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,130 psi | 90% | 2730 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,230 psi | 89% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,781 psi | 88% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,853 psi | 86% | 2631 fps | 96.2% |
| Somchem S321 | <<locked>> | 86% | 54,810 psi | 88% | 2700 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,288 psi | 87% | 2608 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,245 psi | 89% | 2700 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 55,361 psi | 89% | 2726 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,743 psi | 69% | 2625 fps | 99.5% |
| Unknown powderᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2733 fps | 98.1% |
| Vihtavuori N130 | <<locked>> | 86% | 54,984 psi | 88% | 2579 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,230 psi | 89% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,014 psi | 90% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,012 psi | 87% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,330 psi | 86% | 2661 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,473 psi | 81% | 2674 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 88% | 54,172 psi | 87% | 2667 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 94% | 55,434 psi | 89% | 2684 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,501 psi | 79% | 2677 fps | 97.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,634 psi | 83% | 2664 fps | 99.7% |
| Winchester 748 | <<locked>> | 86% | 54,201 psi | 87% | 2723 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,476 psi | 86% | 2759 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 84% | 53,940 psi | 86% | 2710 fps | 99.8% |
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% | 43,207 psi | 69% | 2448 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,050 psi | 75% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,810 psi | 57% | 2365 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,799 psi | 65% | 2487 fps | 99.6% |
| Accurate 2520 | <<locked>> | 80% | 40,799 psi | 65% | 2487 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 33,881 psi | 54% | 2352 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 36,579 psi | 59% | 2467 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 51,474 psi | 83% | 2523 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,866 psi | 83% | 2546 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,798 psi | 64% | 2457 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 35,955 psi | 58% | 2362 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 52,040 psi | 83% | 2635 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,814 psi | 67% | 2474 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 80% | 41,075 psi | 66% | 2470 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,530 psi | 78% | 2661 fps | 99.4% |
| Alliant Power Pro 2000-MR | 68.4 gr | 82% | 38,247 psi | 61% | 2520 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,967 psi | 53% | 2333 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,820 psi | 78% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,665 psi | 57% | 2392 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,420 psi | 60% | 2477 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,489 psi | 52% | 2388 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,531 psi | 81% | 2523 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,580 psi | 62% | 2451 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 32,285 psi | 52% | 2329 fps | 96.1% |
| Bofors RP7 | <<locked>> | 98% | 52,359 psi | 84% | 2648 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,743 psi | 70% | 2467 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,914 psi | 64% | 2484 fps | 98.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,816 psi | 70% | 2612 fps | 97.8% |
| Hodgdon H322 | <<locked>> | 80% | 44,193 psi | 71% | 2516 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,285 psi | 82% | 2635 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 40,683 psi | 65% | 2487 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 49,879 psi | 80% | 2700 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 40,103 psi | 64% | 2470 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,082 psi | 51% | 2329 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,823 psi | 54% | 2385 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,904 psi | 42% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,694 psi | 57% | 2362 fps | 96.6% |
| IMR 3031 | <<locked>> | 80% | 35,897 psi | 58% | 2411 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,302 psi | 57% | 2343 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 50,676 psi | 81% | 2595 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,356 psi | 79% | 2507 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 51,271 psi | 82% | 2635 fps | 95.6% |
| IMR 4831 | <<locked>> | 98% | 38,392 psi | 62% | 2487 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 36,492 psi | 59% | 2421 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 80% | 41,814 psi | 67% | 2474 fps | 98.8% |
| Lovex D073.4 | <<locked>> | 80% | 49,066 psi | 79% | 2579 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 46,804 psi | 75% | 2552 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 38,305 psi | 61% | 2441 fps | 99.3% |
| Lovex S060 | <<locked>> | 80% | 40,422 psi | 65% | 2405 fps | 97.5% |
| Lovex S062 | <<locked>> | 80% | 35,288 psi | 57% | 2352 fps | 97.4% |
| Lovex S065 | <<locked>> | 94% | 44,338 psi | 71% | 2526 fps | 95.6% |
| Lovex S070 | <<locked>> | 98% | 47,500 psi | 76% | 2602 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 38,972 psi | 62% | 2418 fps | 98.3% |
| Norma 202 | <<locked>> | 80% | 39,001 psi | 63% | 2428 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 35,056 psi | 56% | 2382 fps | 95.9% |
| Norma URP | <<locked>> | 94% | 39,552 psi | 63% | 2520 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 34,301 psi | 55% | 2382 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 98% | 44,367 psi | 71% | 2608 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 41,669 psi | 67% | 2467 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,698 psi | 65% | 2487 fps | 97.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,194 psi | 72% | 2516 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,150 psi | 42% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,862 psi | 75% | 2556 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 47,036 psi | 75% | 2575 fps | 95.5% |
| ReloadSwiss RS 52 | 64.7 gr | 80% | 36,738 psi | 59% | 2477 fps | 95.8% |
| ReloadSwiss RS 60 | 65.7 gr | 80% | 30,385 psi | 49% | 2343 fps | 96.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,943 psi | 62% | 2533 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,699 psi | 68% | 2602 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 42,757 psi | 69% | 2467 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 37,086 psi | 59% | 2372 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 80% | 30,472 psi | 49% | 2277 fps | 95% |
| Rottweil R 907 | <<locked>> | 98% | 52,359 psi | 84% | 2648 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 44,338 psi | 71% | 2526 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,305 psi | 61% | 2441 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 35,288 psi | 57% | 2352 fps | 97.4% |
| Shooters World SW4350 | <<locked>> | 98% | 47,500 psi | 76% | 2602 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,385 psi | 79% | 2569 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,257 psi | 84% | 2644 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,663 psi | 54% | 2372 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,690 psi | 80% | 2559 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,581 psi | 63% | 2434 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,261 psi | 61% | 2428 fps | 96.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,640 psi | 65% | 2385 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,489 psi | 54% | 2260 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 50,299 psi | 81% | 2579 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,802 psi | 72% | 2546 fps | 99.4% |
| Somchem S335 | <<locked>> | 80% | 40,103 psi | 64% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,291 psi | 63% | 2438 fps | 97.1% |
| Somchem S355 | <<locked>> | 80% | 31,531 psi | 51% | 2287 fps | 95.1% |
| Somchem S365 | <<locked>> | 88% | 29,167 psi | 47% | 2310 fps | 95.3% |
| Unknown powder | <<locked>> | 92% | 40,770 psi | 65% | 2530 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 46,035 psi | 74% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,814 psi | 65% | 2385 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,158 psi | 58% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,941 psi | 59% | 2369 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 29,921 psi | 48% | 2231 fps | 96.1% |
| Vihtavuori N160 | <<locked>> | 92% | 39,088 psi | 63% | 2474 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 41,611 psi | 67% | 2464 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 35,462 psi | 57% | 2356 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 92% | 38,174 psi | 61% | 2474 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,590 psi | 52% | 2303 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 43,961 psi | 70% | 2562 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 49,879 psi | 80% | 2700 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,688 psi | 75% | 2602 fps | 99.1% |
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 115 powders for .375 H&H Mag. loaded with the .375 | 255gr | Barnes Original FN FB. Alliant Reloder-17 delivers the highest muzzle velocity at 2,838 fps; across all powders the maximum-charge window runs from 1,621 fps to 2,838 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. Accurate 3100, Accurate 4350, Alliant Reloder-16 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, ReloadSwiss RS 52 rank at the top here: for .375 H&H Mag. with the .375 | 255gr | Barnes Original FN FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Alliant Reloder-26, Hodgdon H4350 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.