Load Specifications
Bullet Manufacturer:Hammer
Bullet Weight:305 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
Recommended Twist Rate:1:17.0
Load data in caliber .375 H&H Mag. with .375 | 305gr | Hammer Stone Hammer bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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>> | 86% | 54,346 psi | 87% | 2339 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,202 psi | 90% | 2405 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,695 psi | 89% | 2398 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,404 psi | 87% | 2421 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,579 psi | 89% | 2402 fps | 97.1% |
| Accurate 4064 | <<locked>> | 94% | 55,521 psi | 89% | 2441 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2464 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 53,388 psi | 86% | 2428 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 54,273 psi | 87% | 2428 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,912 psi | 90% | 2431 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,202 psi | 90% | 2402 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,143 psi | 87% | 2474 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,985 psi | 90% | 2579 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 53,708 psi | 86% | 2444 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,288 psi | 87% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,520 psi | 87% | 2464 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,821 psi | 80% | 2470 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,998 psi | 87% | 2549 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,317 psi | 57% | 2241 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,754 psi | 62% | 2365 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,825 psi | 90% | 2326 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,347 psi | 90% | 2487 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 54,070 psi | 87% | 2457 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,781 psi | 88% | 2431 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,404 psi | 87% | 2372 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,824 psi | 88% | 2457 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,098 psi | 85% | 2497 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 53,214 psi | 85% | 2379 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,041 psi | 87% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,564 psi | 89% | 2474 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2510 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 55,579 psi | 89% | 2480 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 53,867 psi | 86% | 2438 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,890 psi | 74% | 2362 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,202 psi | 90% | 2510 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,332 psi | 89% | 2546 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 56% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,129 psi | 88% | 2441 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,490 psi | 86% | 2421 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,737 psi | 86% | 2411 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,085 psi | 87% | 2395 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 54,302 psi | 87% | 2300 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,256 psi | 82% | 2408 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,316 psi | 85% | 2415 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,457 psi | 78% | 2415 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 55,869 psi | 90% | 2490 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,912 psi | 90% | 2431 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 56,202 psi | 90% | 2418 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 56,072 psi | 90% | 2448 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,359 psi | 86% | 2365 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 53,287 psi | 85% | 2408 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2451 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,968 psi | 85% | 2438 fps | 97.8% |
| Norma 201 | <<locked>> | 90% | 55,405 psi | 89% | 2421 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,753 psi | 89% | 2421 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,664 psi | 86% | 2454 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2457 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 92% | 53,853 psi | 86% | 2477 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,588 psi | 80% | 2454 fps | 97.9% |
| Ramshot TAC | <<locked>> | 88% | 56,144 psi | 90% | 2448 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,521 psi | 89% | 2464 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,330 psi | 86% | 2388 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,492 psi | 89% | 2411 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,956 psi | 90% | 2457 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,766 psi | 88% | 2523 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,838 psi | 86% | 2549 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2484 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,126 psi | 82% | 2510 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 86% | 53,287 psi | 85% | 2365 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,927 psi | 90% | 2421 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 53,940 psi | 86% | 2451 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,781 psi | 88% | 2431 fps | 97.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2451 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 56,072 psi | 90% | 2448 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,287 psi | 85% | 2408 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,968 psi | 85% | 2438 fps | 97.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,158 psi | 88% | 2388 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,593 psi | 89% | 2507 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,143 psi | 88% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,433 psi | 87% | 2428 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,143 psi | 88% | 2451 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,027 psi | 87% | 2329 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 53,751 psi | 86% | 2329 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2411 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 53,606 psi | 86% | 2418 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,391 psi | 90% | 2365 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,911 psi | 86% | 2421 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 54,273 psi | 87% | 2448 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,092 psi | 72% | 2415 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 53,853 psi | 86% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,157 psi | 87% | 2316 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,347 psi | 89% | 2388 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,362 psi | 90% | 2405 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,956 psi | 90% | 2431 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,968 psi | 85% | 2454 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 88% | 56,333 psi | 90% | 2428 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,375 psi | 87% | 2405 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,069 psi | 83% | 2461 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,927 psi | 61% | 2306 fps | 97.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,737 psi | 86% | 2441 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,999 psi | 90% | 2470 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2516 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,560 psi | 51% | 2228 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,607 psi | 88% | 2454 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% | 45,368 psi | 73% | 2224 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,182 psi | 79% | 2320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,855 psi | 61% | 2162 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,411 psi | 71% | 2287 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,832 psi | 73% | 2264 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,766 psi | 57% | 2156 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 31,647 psi | 51% | 2133 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 41,539 psi | 67% | 2251 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 35,491 psi | 57% | 2123 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,569 psi | 70% | 2257 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 43,424 psi | 70% | 2247 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,749 psi | 81% | 2428 fps | 100% |
| Alliant Power Pro 2000-MR | 60.2 gr | 80% | 37,492 psi | 60% | 2270 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,751 psi | 56% | 2142 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,952 psi | 82% | 2300 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,376 psi | 60% | 2195 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,706 psi | 52% | 2146 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,965 psi | 48% | 2110 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,602 psi | 47% | 2106 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,260 psi | 58% | 2310 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,475 psi | 84% | 2287 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,480 psi | 65% | 2251 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 34,098 psi | 55% | 2142 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 45,513 psi | 73% | 2297 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,629 psi | 73% | 2251 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,959 psi | 67% | 2277 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,137 psi | 74% | 2395 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 49,937 psi | 80% | 2339 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,589 psi | 81% | 2362 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,070 psi | 56% | 2142 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 41,843 psi | 67% | 2320 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 94% | 48,892 psi | 78% | 2385 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 41,858 psi | 67% | 2257 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,007 psi | 45% | 2014 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,666 psi | 60% | 2234 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 44,773 psi | 72% | 2385 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,121 psi | 42% | 1286 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,219 psi | 64% | 2218 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 41,249 psi | 66% | 2254 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,231 psi | 60% | 2152 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,250 psi | 68% | 2211 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 51,372 psi | 82% | 2267 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 45,368 psi | 73% | 2320 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,483 psi | 71% | 2280 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 32,938 psi | 53% | 2146 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 38,218 psi | 61% | 2221 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 43,569 psi | 70% | 2257 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,979 psi | 79% | 2329 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,234 psi | 65% | 2234 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,018 psi | 67% | 2198 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 36,985 psi | 59% | 2156 fps | 99% |
| Lovex S065 | <<locked>> | 88% | 38,682 psi | 62% | 2192 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 41,408 psi | 66% | 2257 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 40,799 psi | 65% | 2211 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 40,959 psi | 66% | 2218 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,767 psi | 59% | 2185 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 34,461 psi | 55% | 2182 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 36,114 psi | 58% | 2195 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 40,930 psi | 66% | 2310 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 43,337 psi | 69% | 2260 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,728 psi | 69% | 2280 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,007 psi | 75% | 2300 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 42% | 1319 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,834 psi | 78% | 2326 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,553 psi | 65% | 2224 fps | 95.3% |
| ReloadSwiss RS 52 | 58.4 gr | 80% | 38,841 psi | 62% | 2280 fps | 98% |
| ReloadSwiss RS 60 | 59.3 gr | 80% | 31,908 psi | 51% | 2169 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,663 psi | 54% | 2192 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 36,593 psi | 59% | 2247 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 44,744 psi | 72% | 2247 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,870 psi | 62% | 2172 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,169 psi | 52% | 2096 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 45,513 psi | 73% | 2297 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,682 psi | 62% | 2192 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,234 psi | 65% | 2234 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,985 psi | 59% | 2156 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 41,408 psi | 66% | 2257 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,576 psi | 83% | 2343 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,228 psi | 53% | 2139 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,692 psi | 83% | 2320 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,510 psi | 67% | 2238 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,118 psi | 64% | 2224 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,206 psi | 68% | 2169 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,925 psi | 56% | 2060 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,192 psi | 69% | 2231 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 46,862 psi | 75% | 2326 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,887 psi | 67% | 2175 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,205 psi | 66% | 2238 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 33,199 psi | 53% | 2103 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 25,512 psi | 41% | 1998 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 47,747 psi | 77% | 2221 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,453 psi | 68% | 2165 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,985 psi | 61% | 2156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,711 psi | 62% | 2165 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,459 psi | 50% | 2051 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 33,953 psi | 54% | 2139 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 43,540 psi | 70% | 2254 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 37,130 psi | 60% | 2156 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 33,214 psi | 53% | 2142 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 31,357 psi | 50% | 2169 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,021 psi | 45% | 1985 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 42,917 psi | 69% | 2293 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 42,018 psi | 67% | 2323 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,617 psi | 47% | 2169 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,320 psi | 63% | 2228 fps | 98.9% |
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 H&H Mag. loaded with the .375 | 305gr | Hammer Stone Hammer. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,579 fps; across all powders the maximum-charge window runs from 1,444 fps to 2,579 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 (430 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:17.0 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .375 H&H Mag. with the .375 | 305gr | Hammer Stone Hammer 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.