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:1:6.0
Load data in caliber .375 H&H Mag. with .375 | 305gr | Hammer Claw Hammer 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 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% | 54,447 psi | 87% | 2339 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 56,275 psi | 90% | 2405 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,564 psi | 89% | 2398 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,159 psi | 90% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 52,895 psi | 85% | 2359 fps | 96.5% |
| Accurate 4064 | <<locked>> | 94% | 56,188 psi | 90% | 2454 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,909 psi | 83% | 2484 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 88% | 53,983 psi | 87% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 54,839 psi | 88% | 2441 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,272 psi | 85% | 2402 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,417 psi | 86% | 2375 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,230 psi | 87% | 2474 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,113 psi | 85% | 2546 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,534 psi | 87% | 2461 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,824 psi | 88% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,071 psi | 88% | 2477 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,488 psi | 81% | 2484 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,882 psi | 88% | 2569 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,810 psi | 57% | 2257 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,392 psi | 63% | 2385 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,534 psi | 86% | 2457 fps | 99.6% |
| Bofors RP3 | <<locked>> | 94% | 54,882 psi | 88% | 2474 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,259 psi | 89% | 2444 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,027 psi | 88% | 2385 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,853 psi | 88% | 2457 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 52,924 psi | 85% | 2493 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 56,434 psi | 90% | 2421 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,028 psi | 90% | 2484 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 53,229 psi | 85% | 2503 fps | 97.8% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,056 psi | 87% | 2464 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 54,505 psi | 87% | 2451 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,572 psi | 75% | 2379 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,345 psi | 86% | 2480 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 56,333 psi | 90% | 2566 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 56% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,317 psi | 87% | 2434 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 56,028 psi | 90% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,374 psi | 86% | 2411 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,214 psi | 85% | 2388 fps | 97.6% |
| IMR 4198 | <<locked>> | 82% | 54,897 psi | 88% | 2313 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,866 psi | 83% | 2421 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,417 psi | 86% | 2415 fps | 97.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,729 psi | 70% | 2349 fps | 98.5% |
| IMR 4895 | <<locked>> | 90% | 53,113 psi | 85% | 2461 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,272 psi | 85% | 2402 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,214 psi | 85% | 2388 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,272 psi | 85% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,925 psi | 86% | 2379 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,099 psi | 87% | 2425 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2464 fps | 99.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2451 fps | 98% |
| Norma 201 | <<locked>> | 90% | 56,057 psi | 90% | 2434 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,258 psi | 85% | 2398 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,230 psi | 87% | 2467 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 51,213 psi | 82% | 2474 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 92% | 54,592 psi | 88% | 2490 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,154 psi | 80% | 2467 fps | 98% |
| Ramshot TAC | <<locked>> | 86% | 53,374 psi | 86% | 2418 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,246 psi | 90% | 2480 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,128 psi | 87% | 2405 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1486 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,144 psi | 90% | 2425 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,098 psi | 85% | 2425 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,463 psi | 89% | 2536 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,810 psi | 88% | 2569 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,314 psi | 82% | 2503 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2523 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 86% | 53,983 psi | 87% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,171 psi | 85% | 2392 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,752 psi | 88% | 2467 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,259 psi | 89% | 2444 fps | 97.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2464 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,272 psi | 85% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,099 psi | 87% | 2425 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2434 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,753 psi | 89% | 2402 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 52,953 psi | 85% | 2477 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,984 psi | 88% | 2356 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,187 psi | 88% | 2444 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,651 psi | 89% | 2464 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,708 psi | 88% | 2343 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,302 psi | 87% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,447 psi | 86% | 2382 fps | 97.6% |
| Somchem S321 | <<locked>> | 84% | 54,172 psi | 87% | 2431 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,737 psi | 86% | 2339 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,694 psi | 88% | 2438 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 55,114 psi | 88% | 2461 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,774 psi | 73% | 2431 fps | 100% |
| Unknown powderᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2526 fps | 99.5% |
| Vihtavuori N130 | <<locked>> | 84% | 53,403 psi | 86% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 54,157 psi | 87% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,187 psi | 88% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,246 psi | 90% | 2411 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2402 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,098 psi | 85% | 2457 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 86% | 56,362 psi | 90% | 2448 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,912 psi | 90% | 2438 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,258 psi | 85% | 2500 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,566 psi | 62% | 2323 fps | 98% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,447 psi | 87% | 2454 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,708 psi | 86% | 2451 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,229 psi | 85% | 2503 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,923 psi | 51% | 2244 fps | 97.4% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,301 psi | 85% | 2444 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% | 45,223 psi | 73% | 2221 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,284 psi | 79% | 2320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,724 psi | 60% | 2159 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,772 psi | 69% | 2270 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 46,586 psi | 75% | 2270 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 36,274 psi | 58% | 2169 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,140 psi | 52% | 2149 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 42,134 psi | 68% | 2264 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 35,868 psi | 58% | 2136 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,193 psi | 71% | 2274 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 43,990 psi | 71% | 2257 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,836 psi | 82% | 2428 fps | 100% |
| Alliant Power Pro 2000-MR | 61 gr | 80% | 38,000 psi | 61% | 2287 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,201 psi | 56% | 2156 fps | 98.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,517 psi | 83% | 2313 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,942 psi | 61% | 2211 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,011 psi | 53% | 2159 fps | 95.4% |
| Alliant Reloder-17 | 60.1 gr | 80% | 30,385 psi | 49% | 2126 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,979 psi | 48% | 2119 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,505 psi | 55% | 2277 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,017 psi | 66% | 2267 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 34,693 psi | 56% | 2159 fps | 98.4% |
| Bofors RP7 | <<locked>> | 92% | 45,963 psi | 74% | 2310 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,021 psi | 74% | 2260 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,047 psi | 67% | 2277 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,180 psi | 74% | 2395 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 46,876 psi | 75% | 2303 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,636 psi | 57% | 2159 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 90% | 43,439 psi | 70% | 2352 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 96% | 47,863 psi | 77% | 2375 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,511 psi | 68% | 2274 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,442 psi | 46% | 2031 fps | 95.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,071 psi | 58% | 2208 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 94% | 45,513 psi | 73% | 2405 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 42% | 1293 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,563 psi | 57% | 2129 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 38,363 psi | 62% | 2211 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,201 psi | 56% | 2116 fps | 97.1% |
| IMR 4166 Enduron | <<locked>> | 86% | 42,047 psi | 67% | 2215 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 51,750 psi | 83% | 2277 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 45,745 psi | 73% | 2329 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,541 psi | 71% | 2280 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 32,126 psi | 52% | 2129 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,856 psi | 62% | 2234 fps | 98.5% |
| IMR 8208 XBR | <<locked>> | 80% | 44,193 psi | 71% | 2274 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 49,588 psi | 80% | 2343 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,886 psi | 66% | 2247 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,438 psi | 68% | 2211 fps | 99% |
| Lovex S062 | <<locked>> | 80% | 37,449 psi | 60% | 2169 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 36,912 psi | 59% | 2162 fps | 95.2% |
| Lovex S070 | <<locked>> | 92% | 41,872 psi | 67% | 2270 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 41,278 psi | 66% | 2224 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 41,394 psi | 66% | 2231 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,333 psi | 60% | 2201 fps | 98.1% |
| Norma URP | <<locked>> | 86% | 32,866 psi | 53% | 2152 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 36,608 psi | 59% | 2211 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 38,914 psi | 62% | 2277 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 43,845 psi | 70% | 2274 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,294 psi | 69% | 2293 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,514 psi | 76% | 2313 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1325 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,472 psi | 79% | 2339 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,031 psi | 66% | 2238 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,320 psi | 63% | 2293 fps | 98.1% |
| ReloadSwiss RS 60 | 60.1 gr | 80% | 32,358 psi | 52% | 2182 fps | 99.2% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,272 psi | 55% | 2211 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,115 psi | 60% | 2267 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 45,237 psi | 73% | 2257 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,291 psi | 63% | 2182 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,590 psi | 52% | 2110 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 45,963 psi | 74% | 2310 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 36,912 psi | 59% | 2162 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,886 psi | 66% | 2247 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,449 psi | 60% | 2169 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 92% | 41,263 psi | 66% | 2254 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,199 psi | 84% | 2356 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,562 psi | 54% | 2152 fps | 96.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,779 psi | 83% | 2320 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,003 psi | 67% | 2251 fps | 97.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,495 psi | 65% | 2238 fps | 98.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,670 psi | 68% | 2182 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,346 psi | 57% | 2070 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,903 psi | 70% | 2247 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 47,384 psi | 76% | 2339 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,279 psi | 68% | 2185 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,756 psi | 67% | 2251 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 33,576 psi | 54% | 2116 fps | 97.6% |
| Somchem S365 | <<locked>> | 82% | 25,918 psi | 42% | 2018 fps | 95.8% |
| Unknown powder | <<locked>> | 86% | 35,868 psi | 58% | 2201 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 47,413 psi | 76% | 2224 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,306 psi | 65% | 2139 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,029 psi | 61% | 2156 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,638 psi | 62% | 2169 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 28,660 psi | 46% | 1995 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 84% | 33,605 psi | 54% | 2136 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,470 psi | 75% | 2316 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,348 psi | 61% | 2188 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,808 psi | 54% | 2172 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 29,994 psi | 48% | 2139 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,384 psi | 46% | 1998 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 46,818 psi | 75% | 2359 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,439 psi | 70% | 2352 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,282 psi | 45% | 2136 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,443 psi | 79% | 2392 fps | 99.9% |
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 121 powders for .375 H&H Mag. loaded with the .375 | 305gr | Hammer Claw Hammer . Alliant Reloder-17 delivers the highest muzzle velocity at 2,569 fps; across all powders the maximum-charge window runs from 1,450 fps to 2,569 fps. Accurate 3100 gives the best case fill at 100 %, and 121 of the 121 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 305.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 H&H Mag. with the .375 | 305gr | Hammer Claw Hammer they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.