Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 270gr | Lehigh Defense Controlled Fracturing bullet and 101 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 Hodgdon LEVERevolution.
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.
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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>> | 90% | 53,011 psi | 85% | 2474 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,737 psi | 86% | 2562 fps | 98.9% |
| Accurate 2230 | <<locked>> | 82% | 54,418 psi | 87% | 2572 fps | 99.2% |
| Accurate 2460 | <<locked>> | 88% | 55,071 psi | 88% | 2543 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 52,707 psi | 85% | 2526 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 52,750 psi | 85% | 2552 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 55,869 psi | 90% | 2602 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,466 psi | 66% | 2461 fps | 96.3% |
| Accurate LT-30 | <<locked>> | 84% | 53,882 psi | 86% | 2434 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,317 psi | 87% | 2454 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,608 psi | 89% | 2602 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 55,216 psi | 89% | 2448 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,243 psi | 85% | 2549 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 53,896 psi | 86% | 2539 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,027 psi | 88% | 2562 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 54,549 psi | 87% | 2546 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 52,997 psi | 85% | 2612 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,187 psi | 88% | 2703 fps | 99.1% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,303 psi | 89% | 2612 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,156 psi | 85% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 56,333 psi | 90% | 2631 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,627 psi | 68% | 2470 fps | 96.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2615 fps | 99.3% |
| Alliant Reloder-7 | <<locked>> | 82% | 56,028 psi | 90% | 2464 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 56,202 psi | 90% | 2474 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,361 psi | 89% | 2615 fps | 98.9% |
| Bofors RP3ᴾ | <<locked>> | 100% | 55,666 psi | 89% | 2628 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,128 psi | 87% | 2507 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,388 psi | 86% | 2589 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,448 psi | 89% | 2677 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 88% | 55,985 psi | 90% | 2566 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,301 psi | 85% | 2546 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 53,853 psi | 86% | 2589 fps | 98.1% |
| Hodgdon H4198 | <<locked>> | 82% | 55,695 psi | 89% | 2474 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 56,057 psi | 90% | 2612 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,798 psi | 62% | 2369 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,447 psi | 87% | 2638 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,243 psi | 55% | 1516 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,288 psi | 87% | 2569 fps | 99.6% |
| IMR 3031 | <<locked>> | 94% | 54,998 psi | 88% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 56,115 psi | 90% | 2582 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,679 psi | 86% | 2513 fps | 95.8% |
| IMR 4198 | <<locked>> | 86% | 54,186 psi | 87% | 2451 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,205 psi | 64% | 2415 fps | 96% |
| IMR 4895 | <<locked>> | 96% | 54,302 psi | 87% | 2618 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 92% | 55,027 psi | 88% | 2562 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 82% | 55,085 psi | 88% | 2552 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,085 psi | 88% | 2552 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,331 psi | 87% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 56,057 psi | 90% | 2539 fps | 99.5% |
| Lovex S062 | <<locked>> | 98% | 54,998 psi | 88% | 2575 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2467 fps | 96.1% |
| Norma 200 | <<locked>> | 82% | 52,924 psi | 85% | 2457 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,128 psi | 87% | 2552 fps | 99.9% |
| Norma 202 | <<locked>> | 94% | 54,433 psi | 87% | 2559 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,332 psi | 89% | 2621 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 42,438 psi | 68% | 2464 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 98% | 55,970 psi | 90% | 2648 fps | 99.5% |
| Ramshot TAC | <<locked>> | 92% | 55,883 psi | 90% | 2579 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,752 psi | 88% | 2595 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,011 psi | 85% | 2520 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,330 psi | 55% | 1549 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,853 psi | 88% | 2549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 54,940 psi | 88% | 2572 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 56,289 psi | 90% | 2694 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2677 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 41,800 psi | 67% | 2480 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 92% | 54,853 psi | 88% | 2536 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 54,346 psi | 87% | 2546 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2566 fps | 99.6% |
| Shooters World AR Plus | <<locked>> | 82% | 55,085 psi | 88% | 2552 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2467 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,331 psi | 87% | 2582 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,998 psi | 88% | 2575 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 54,955 psi | 88% | 2523 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,563 psi | 87% | 2208 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,273 psi | 87% | 2552 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2628 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,505 psi | 87% | 2503 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,388 psi | 86% | 2549 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,998 psi | 87% | 2575 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,490 psi | 86% | 2464 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2500 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 52,750 psi | 85% | 2552 fps | 99.9% |
| Somchem S335 | <<locked>> | 94% | 55,477 psi | 89% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 52,910 psi | 85% | 2546 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,402 psi | 84% | 2566 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,463 psi | 60% | 2408 fps | 98.3% |
| Vihtavuori N120 | <<locked>> | 82% | 55,143 psi | 88% | 2402 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,388 psi | 86% | 2441 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,359 psi | 86% | 2454 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,345 psi | 86% | 2520 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,201 psi | 89% | 2539 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 2510 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,759 psi | 72% | 2464 fps | 96.7% |
| Vihtavuori N530 | <<locked>> | 92% | 55,709 psi | 89% | 2566 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 53,127 psi | 85% | 2536 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,569 psi | 70% | 2467 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,267 psi | 74% | 2461 fps | 98.8% |
| Winchester 748 | <<locked>> | 92% | 54,694 psi | 88% | 2608 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,447 psi | 86% | 2585 fps | 99.6% |
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% | 38,841 psi | 62% | 2270 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,256 psi | 81% | 2510 fps | 98.4% |
| Accurate 2230 | <<locked>> | 80% | 50,618 psi | 81% | 2520 fps | 98.7% |
| Accurate 2460 | <<locked>> | 80% | 41,887 psi | 67% | 2356 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 30,835 psi | 49% | 2178 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 37,144 psi | 60% | 2306 fps | 99.1% |
| Accurate 4064 | <<locked>> | 80% | 29,240 psi | 47% | 2159 fps | 98.1% |
| Accurate 4350 | <<locked>> | 98% | 38,566 psi | 62% | 2405 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 47,572 psi | 76% | 2349 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 47,950 psi | 77% | 2365 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 35,665 psi | 57% | 2267 fps | 95.9% |
| ADI AR 2207 | <<locked>> | 80% | 51,953 psi | 83% | 2408 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 36,608 psi | 59% | 2270 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 47,137 psi | 76% | 2448 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,724 psi | 60% | 2287 fps | 97.8% |
| Alliant AR-Comp | <<locked>> | 80% | 36,303 psi | 58% | 2293 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,482 psi | 70% | 2461 fps | 98.5% |
| Alliant Power Pro 2000-MR | 63 gr | 86% | 39,160 psi | 63% | 2425 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,024 psi | 50% | 2192 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,106 psi | 71% | 2359 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,013 psi | 58% | 2297 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,190 psi | 64% | 2425 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,201 psi | 56% | 2349 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 80% | 52,765 psi | 85% | 2425 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,224 psi | 74% | 2346 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 39,494 psi | 63% | 2362 fps | 95.8% |
| Bofors RP3 | <<locked>> | 82% | 30,008 psi | 48% | 2182 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,813 psi | 64% | 2283 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,302 psi | 57% | 2290 fps | 97.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,001 psi | 63% | 2405 fps | 96.3% |
| Hodgdon H322 | <<locked>> | 80% | 42,975 psi | 69% | 2385 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,453 psi | 70% | 2402 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 41,292 psi | 66% | 2388 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 52,446 psi | 84% | 2431 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 35,911 psi | 58% | 2280 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,200 psi | 55% | 2274 fps | 95.6% |
| Hodgdon LEVERevolution | 57.5 gr | 80% | 31,879 psi | 51% | 2238 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,396 psi | 41% | 1352 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,693 psi | 56% | 2238 fps | 96.1% |
| IMR 3031 | <<locked>> | 80% | 34,548 psi | 55% | 2287 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 36,085 psi | 58% | 2254 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,386 psi | 81% | 2467 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 45,353 psi | 73% | 2333 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 37,594 psi | 60% | 2365 fps | 95.1% |
| IMR 4895 | <<locked>> | 82% | 34,432 psi | 55% | 2274 fps | 95.6% |
| IMR 8208 XBR | <<locked>> | 80% | 37,724 psi | 60% | 2287 fps | 97.8% |
| Lovex D073.4 | <<locked>> | 80% | 51,271 psi | 82% | 2503 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 41,727 psi | 67% | 2359 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 33,460 psi | 54% | 2244 fps | 98.3% |
| Lovex S060 | <<locked>> | 80% | 36,767 psi | 59% | 2224 fps | 96.2% |
| Lovex S062 | <<locked>> | 80% | 31,314 psi | 50% | 2169 fps | 95.9% |
| Lovex S065 | <<locked>> | 98% | 44,788 psi | 72% | 2425 fps | 95.4% |
| Norma 200 | <<locked>> | 80% | 49,821 psi | 80% | 2418 fps | 100% |
| Norma 201 | <<locked>> | 80% | 34,838 psi | 56% | 2231 fps | 97.1% |
| Norma 202 | <<locked>> | 80% | 34,867 psi | 56% | 2247 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 33,054 psi | 53% | 2238 fps | 95% |
| Norma URP | <<locked>> | 98% | 39,726 psi | 64% | 2411 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 84% | 34,983 psi | 56% | 2293 fps | 95.3% |
| Ramshot TAC | <<locked>> | 84% | 42,801 psi | 69% | 2375 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,405 psi | 58% | 2293 fps | 96% |
| Ramshot X-Terminator | <<locked>> | 80% | 40,944 psi | 66% | 2329 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,411 psi | 41% | 1381 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,308 psi | 68% | 2365 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 48,066 psi | 77% | 2474 fps | 95.3% |
| ReloadSwiss RS 52 | 59.7 gr | 84% | 37,217 psi | 60% | 2382 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,892 psi | 46% | 2198 fps | 95.7% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,131 psi | 63% | 2428 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 38,247 psi | 61% | 2277 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 33,069 psi | 53% | 2185 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 86% | 32,256 psi | 52% | 2228 fps | 95.6% |
| Shooters World AR Plus | <<locked>> | 80% | 51,271 psi | 82% | 2503 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 44,788 psi | 72% | 2425 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,460 psi | 54% | 2244 fps | 98.3% |
| Shooters World Precision | <<locked>> | 80% | 31,314 psi | 50% | 2169 fps | 95.9% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,701 psi | 72% | 2379 fps | 98.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,866 psi | 83% | 2178 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,297 psi | 76% | 2454 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,069 psi | 55% | 2280 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,136 psi | 72% | 2379 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,422 psi | 65% | 2346 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,272 psi | 55% | 2241 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,782 psi | 59% | 2208 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,936 psi | 48% | 2087 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 40,030 psi | 64% | 2352 fps | 98.6% |
| Somchem S335 | <<locked>> | 80% | 36,114 psi | 58% | 2211 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 34,940 psi | 56% | 2247 fps | 95.5% |
| Somchem S355 | <<locked>> | 84% | 31,633 psi | 51% | 2195 fps | 95% |
| Somchem S365 | <<locked>> | 92% | 29,153 psi | 47% | 2211 fps | 95% |
| Vihtavuori N120 | <<locked>> | 80% | 51,866 psi | 83% | 2362 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,858 psi | 67% | 2280 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,869 psi | 59% | 2215 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,894 psi | 51% | 2185 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 32,953 psi | 53% | 2192 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 82% | 27,992 psi | 45% | 2093 fps | 95.1% |
| Vihtavuori N160 | <<locked>> | 96% | 39,392 psi | 63% | 2369 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 37,521 psi | 60% | 2280 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 80% | 31,604 psi | 51% | 2175 fps | 98.2% |
| Vihtavuori N550 | <<locked>> | 98% | 40,814 psi | 65% | 2418 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 33,228 psi | 53% | 2211 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 36,158 psi | 58% | 2313 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,112 psi | 53% | 2234 fps | 95.7% |
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 101 powders for .375 H&H Mag. loaded with the .375 | 270gr | Lehigh Defense Controlled Fracturing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,703 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,703 fps. Accurate 4064 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, Alliant Reloder- TS 15.5 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, Hodgdon LEVERevolution rank at the top here: for .375 H&H Mag. with the .375 | 270gr | Lehigh Defense Controlled Fracturing 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.