Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 275gr | CutEdge DGBR-HP bullet and 97 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, Hodgdon CFE223 and Ramshot Big Game.
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>> | 90% | 54,911 psi | 88% | 2480 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,361 psi | 89% | 2572 fps | 99.3% |
| Accurate 2230 | <<locked>> | 82% | 56,362 psi | 90% | 2585 fps | 99.5% |
| Accurate 2460 | <<locked>> | 86% | 53,403 psi | 86% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,085 psi | 88% | 2533 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,897 psi | 88% | 2562 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 54,781 psi | 88% | 2572 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,656 psi | 70% | 2480 fps | 97.2% |
| Accurate LT-30 | <<locked>> | 84% | 55,376 psi | 89% | 2438 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,796 psi | 89% | 2461 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,114 psi | 87% | 2569 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 55,085 psi | 88% | 2562 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 55,840 psi | 90% | 2546 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,563 psi | 86% | 2530 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 52,982 psi | 85% | 2510 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,071 psi | 88% | 2625 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,490 psi | 86% | 2667 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,085 psi | 87% | 2582 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,882 psi | 88% | 2487 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,998 psi | 88% | 2602 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,135 psi | 71% | 2490 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2635 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,201 psi | 87% | 2438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,780 psi | 86% | 2582 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 54,085 psi | 87% | 2592 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,767 psi | 89% | 2516 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,608 psi | 89% | 2602 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,737 psi | 86% | 2638 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,273 psi | 87% | 2530 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,303 psi | 89% | 2552 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,086 psi | 90% | 2605 fps | 98.7% |
| Hodgdon H4895 | <<locked>> | 92% | 54,549 psi | 87% | 2579 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,350 psi | 65% | 2388 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 52,968 psi | 85% | 2605 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,316 psi | 55% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,941 psi | 90% | 2579 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 53,635 psi | 86% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,462 psi | 87% | 2546 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,405 psi | 89% | 2530 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 55,666 psi | 89% | 2451 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,143 psi | 87% | 2543 fps | 96.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,916 psi | 67% | 2434 fps | 96.9% |
| IMR 4895 | <<locked>> | 96% | 56,347 psi | 90% | 2631 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 53,563 psi | 86% | 2530 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 53,156 psi | 85% | 2513 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 52,692 psi | 84% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,476 psi | 87% | 2503 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 53,505 psi | 86% | 2543 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2484 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 54,694 psi | 88% | 2461 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,854 psi | 90% | 2559 fps | 100% |
| Norma 202 | <<locked>> | 92% | 53,026 psi | 85% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,056 psi | 87% | 2589 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 44,063 psi | 71% | 2480 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 96% | 54,563 psi | 87% | 2615 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,012 psi | 87% | 2539 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,026 psi | 85% | 2559 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,781 psi | 88% | 2530 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,650 psi | 56% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,142 psi | 85% | 2513 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,229 psi | 85% | 2539 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,795 psi | 88% | 2661 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2690 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,584 psi | 70% | 2500 fps | 96.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,237 psi | 73% | 2520 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 53,534 psi | 86% | 2503 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,362 psi | 90% | 2556 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2579 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,284 psi | 79% | 2484 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 52,692 psi | 84% | 2543 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,505 psi | 86% | 2543 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,171 psi | 85% | 2490 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,724 psi | 89% | 2208 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,043 psi | 90% | 2559 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2641 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,275 psi | 90% | 2510 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,535 psi | 89% | 2566 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,869 psi | 90% | 2589 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,245 psi | 89% | 2474 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,462 psi | 87% | 2464 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,694 psi | 88% | 2562 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,998 psi | 87% | 2470 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,013 psi | 88% | 2562 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,404 psi | 87% | 2579 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,117 psi | 63% | 2431 fps | 99% |
| Vihtavuori N130 | <<locked>> | 88% | 54,998 psi | 88% | 2444 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,129 psi | 88% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,332 psi | 89% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,417 psi | 86% | 2503 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2520 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,673 psi | 75% | 2484 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 90% | 53,867 psi | 86% | 2526 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,013 psi | 88% | 2546 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,484 psi | 73% | 2487 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,819 psi | 77% | 2474 fps | 99.3% |
| Winchester 748 | <<locked>> | 90% | 52,997 psi | 85% | 2569 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,651 psi | 89% | 2598 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% | 40,147 psi | 64% | 2277 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,866 psi | 83% | 2523 fps | 98.9% |
| Accurate 2230 | <<locked>> | 80% | 52,460 psi | 84% | 2533 fps | 99.2% |
| Accurate 2460 | <<locked>> | 80% | 43,381 psi | 70% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,126 psi | 52% | 2188 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,740 psi | 62% | 2323 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 30,443 psi | 49% | 2172 fps | 98.7% |
| Accurate 4350 | <<locked>> | 96% | 37,898 psi | 61% | 2379 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 49,023 psi | 79% | 2356 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,400 psi | 79% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,782 psi | 59% | 2277 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 35,636 psi | 57% | 2238 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 48,718 psi | 78% | 2457 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,870 psi | 62% | 2293 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 37,768 psi | 61% | 2300 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,933 psi | 72% | 2470 fps | 99% |
| Alliant Power Pro 2000-MR | 62.8 gr | 84% | 38,000 psi | 61% | 2388 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,197 psi | 48% | 2159 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,759 psi | 73% | 2365 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,954 psi | 56% | 2260 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 96% | 39,117 psi | 63% | 2392 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,185 psi | 55% | 2316 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,718 psi | 77% | 2352 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,232 psi | 61% | 2326 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 29,370 psi | 47% | 2152 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,075 psi | 66% | 2297 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,782 psi | 59% | 2306 fps | 98.4% |
| Hodgdon CFE223 | 61.2 gr | 80% | 40,553 psi | 65% | 2425 fps | 97.1% |
| Hodgdon H322 | <<locked>> | 80% | 44,541 psi | 71% | 2395 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,107 psi | 72% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,103 psi | 64% | 2356 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 37,057 psi | 59% | 2290 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,344 psi | 53% | 2247 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,040 psi | 53% | 2254 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,440 psi | 41% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,926 psi | 58% | 2254 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 35,882 psi | 58% | 2297 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,157 psi | 56% | 2224 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,950 psi | 78% | 2434 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 46,572 psi | 75% | 2336 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,894 psi | 82% | 2493 fps | 95.6% |
| IMR 4831 | <<locked>> | 96% | 36,709 psi | 59% | 2336 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 33,489 psi | 54% | 2241 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 38,870 psi | 62% | 2293 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 43,192 psi | 69% | 2369 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 34,824 psi | 56% | 2260 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 37,782 psi | 61% | 2234 fps | 96.9% |
| Lovex S062 | <<locked>> | 80% | 32,372 psi | 52% | 2178 fps | 96.7% |
| Lovex S065 | <<locked>> | 96% | 43,613 psi | 70% | 2392 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 51,329 psi | 82% | 2421 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,984 psi | 58% | 2241 fps | 97.8% |
| Norma 202 | <<locked>> | 80% | 36,056 psi | 58% | 2257 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 32,097 psi | 51% | 2201 fps | 95% |
| Norma URP | <<locked>> | 96% | 38,696 psi | 62% | 2382 fps | 95.6% |
| Ramshot Big Game | 61.3 gr | 82% | 33,895 psi | 54% | 2260 fps | 95.3% |
| Ramshot TAC | <<locked>> | 82% | 41,379 psi | 66% | 2339 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,811 psi | 61% | 2310 fps | 96.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,163 psi | 68% | 2339 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,657 psi | 41% | 1381 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,714 psi | 70% | 2375 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,775 psi | 75% | 2441 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 36,114 psi | 58% | 2346 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,007 psi | 45% | 2165 fps | 95.7% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,116 psi | 61% | 2395 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,250 psi | 68% | 2464 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 39,494 psi | 63% | 2287 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 34,171 psi | 55% | 2195 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 84% | 31,531 psi | 51% | 2198 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,613 psi | 70% | 2392 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,824 psi | 56% | 2260 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 32,372 psi | 52% | 2178 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,325 psi | 74% | 2388 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,026 psi | 85% | 2178 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,008 psi | 79% | 2464 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,185 psi | 53% | 2247 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,586 psi | 75% | 2382 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,102 psi | 63% | 2310 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,505 psi | 57% | 2254 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,913 psi | 61% | 2218 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,995 psi | 50% | 2096 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 41,539 psi | 67% | 2365 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 37,231 psi | 60% | 2218 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,332 psi | 58% | 2264 fps | 96.3% |
| Somchem S355 | <<locked>> | 82% | 30,748 psi | 49% | 2162 fps | 95.1% |
| Somchem S365 | <<locked>> | 90% | 28,384 psi | 46% | 2182 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 43,105 psi | 69% | 2283 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,072 psi | 61% | 2221 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,127 psi | 53% | 2195 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,084 psi | 55% | 2198 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 27,238 psi | 44% | 2064 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 94% | 38,377 psi | 62% | 2339 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,856 psi | 62% | 2293 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 32,779 psi | 53% | 2188 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 96% | 39,798 psi | 64% | 2388 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,198 psi | 52% | 2182 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 37,666 psi | 60% | 2326 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,490 psi | 55% | 2251 fps | 96.6% |
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 97 powders for .375 H&H Mag. loaded with the .375 | 275gr | CutEdge DGBR-HP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,690 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,690 fps. Accurate 4350 gives the best case fill at 100 %, and 97 of the 97 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 275.0 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-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, Hodgdon CFE223, Ramshot Big Game rank at the top here: for .375 H&H Mag. with the .375 | 275gr | CutEdge DGBR-HP 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.