Load Specifications
Load data in caliber .375 Ruger with .375 | 305gr | Hammer Claw Hammer bullet and 99 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 Superformance 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.
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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 23"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 54,839 psi | 88% | 2310 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,403 psi | 86% | 2333 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,056 psi | 89% | 2388 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,043 psi | 90% | 2379 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,306 psi | 65% | 2251 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 53,519 psi | 86% | 2379 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,852 psi | 85% | 2448 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 53,824 psi | 87% | 2402 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,868 psi | 88% | 2402 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 52,881 psi | 85% | 2359 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,766 psi | 87% | 2336 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,258 psi | 86% | 2503 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,810 psi | 88% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,347 psi | 89% | 2438 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2493 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,434 psi | 89% | 2526 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,798 psi | 63% | 2280 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,076 psi | 69% | 2411 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,519 psi | 86% | 2415 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 55,506 psi | 89% | 2438 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,564 psi | 90% | 2411 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,737 psi | 88% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,651 psi | 90% | 2428 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,998 psi | 87% | 2470 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 52,881 psi | 85% | 2402 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 55,738 psi | 90% | 2490 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 94% | 53,171 psi | 86% | 2415 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 54,375 psi | 88% | 2411 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,531 psi | 81% | 2388 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,751 psi | 87% | 2441 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,707 psi | 85% | 2474 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,491 psi | 57% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,608 psi | 90% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,476 psi | 88% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,259 psi | 87% | 2385 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,462 psi | 88% | 2372 fps | 98.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,622 psi | 90% | 2431 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,143 psi | 87% | 2395 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,345 psi | 86% | 2441 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 53,287 psi | 86% | 2421 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 52,881 psi | 85% | 2359 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,534 psi | 86% | 2382 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,592 psi | 86% | 2343 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,201 psi | 87% | 2385 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,229 psi | 86% | 2385 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 54,128 psi | 87% | 2418 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 56,086 psi | 90% | 2398 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,258 psi | 86% | 2356 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,505 psi | 88% | 2428 fps | 100% |
| Norma 204 | <<locked>> | 98% | 52,692 psi | 85% | 2428 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 43,120 psi | 69% | 2375 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2480 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,071 psi | 89% | 2451 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,143 psi | 87% | 2480 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 52,997 psi | 85% | 2375 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,159 psi | 90% | 2438 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,751 psi | 87% | 2362 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 58% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,709 psi | 90% | 2382 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,127 psi | 86% | 2388 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,970 psi | 90% | 2500 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,114 psi | 89% | 2523 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,373 psi | 84% | 2467 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2539 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,838 psi | 87% | 2339 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,287 psi | 86% | 2356 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,114 psi | 89% | 2425 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,564 psi | 90% | 2411 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,229 psi | 86% | 2385 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,534 psi | 86% | 2382 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,201 psi | 87% | 2385 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,128 psi | 87% | 2418 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,476 psi | 86% | 2438 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,071 psi | 89% | 2405 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,753 psi | 90% | 2421 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,186 psi | 87% | 2300 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,418 psi | 88% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,737 psi | 87% | 2349 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 53,983 psi | 87% | 2388 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,577 psi | 86% | 2300 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,592 psi | 88% | 2395 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,608 psi | 90% | 2425 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,850 psi | 80% | 2438 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,427 psi | 75% | 2339 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 82% | 54,027 psi | 87% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,433 psi | 88% | 2287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 52,765 psi | 85% | 2323 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,650 psi | 86% | 2339 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,432 psi | 86% | 2362 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,578 psi | 88% | 2434 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 53,316 psi | 86% | 2359 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,245 psi | 89% | 2379 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,519 psi | 86% | 2441 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,264 psi | 68% | 2339 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,911 psi | 88% | 2415 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,214 psi | 86% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,970 psi | 90% | 2493 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,592 psi | 56% | 2280 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,564 psi | 90% | 2428 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 48,443 psi | 78% | 2234 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,133 psi | 66% | 2178 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,182 psi | 78% | 2306 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,294 psi | 70% | 2198 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 37,623 psi | 61% | 2205 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 38,885 psi | 63% | 2175 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,385 psi | 49% | 2073 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,570 psi | 72% | 2270 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 38,014 psi | 61% | 2149 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,659 psi | 75% | 2277 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,094 psi | 76% | 2257 fps | 100% |
| Alliant Power Pro 2000-MR | 63.7 gr | 80% | 40,495 psi | 65% | 2300 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,681 psi | 61% | 2169 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,321 psi | 65% | 2218 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,125 psi | 50% | 2083 fps | 95.1% |
| Alliant Reloder-17 | 62.8 gr | 80% | 32,474 psi | 52% | 2146 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,631 psi | 46% | 2054 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,041 psi | 56% | 2254 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,816 psi | 71% | 2277 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 37,260 psi | 60% | 2172 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 43,366 psi | 70% | 2234 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,385 psi | 78% | 2264 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,469 psi | 73% | 2297 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,227 psi | 81% | 2421 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 38,014 psi | 61% | 2172 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 40,045 psi | 65% | 2257 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 46,688 psi | 75% | 2320 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 45,020 psi | 73% | 2280 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,803 psi | 43% | 1959 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,002 psi | 66% | 2257 fps | 99.7% |
| Hodgdon Superformance | 74.6 gr | 90% | 42,569 psi | 69% | 2316 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 43% | 1299 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,149 psi | 70% | 2238 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 44,715 psi | 72% | 2270 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,914 psi | 64% | 2175 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,322 psi | 68% | 2192 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 43,308 psi | 70% | 2254 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,467 psi | 68% | 2221 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 31,691 psi | 51% | 2087 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,307 psi | 67% | 2244 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,659 psi | 75% | 2277 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,874 psi | 71% | 2254 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,672 psi | 72% | 2218 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 39,813 psi | 64% | 2178 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,072 psi | 60% | 2133 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 39,711 psi | 64% | 2198 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 43,714 psi | 70% | 2231 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,135 psi | 71% | 2238 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,697 psi | 64% | 2208 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 49,168 psi | 79% | 2379 fps | 95.5% |
| Norma MRP | <<locked>> | 98% | 40,451 psi | 65% | 2326 fps | 95% |
| Norma URP | <<locked>> | 82% | 31,067 psi | 50% | 2077 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,160 psi | 63% | 2221 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 36,869 psi | 59% | 2201 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 46,543 psi | 75% | 2283 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,050 psi | 74% | 2300 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,401 psi | 81% | 2316 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,876 psi | 43% | 1332 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,286 psi | 84% | 2339 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,406 psi | 62% | 2156 fps | 95.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,482 psi | 68% | 2306 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,577 psi | 56% | 2201 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,387 psi | 52% | 2133 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,882 psi | 56% | 2185 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 47,659 psi | 77% | 2260 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,713 psi | 67% | 2192 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,070 psi | 56% | 2126 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 43,366 psi | 70% | 2234 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,072 psi | 60% | 2133 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,874 psi | 71% | 2254 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,813 psi | 64% | 2178 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 39,711 psi | 64% | 2198 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,984 psi | 58% | 2165 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,933 psi | 72% | 2264 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,134 psi | 69% | 2247 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,165 psi | 73% | 2188 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,565 psi | 61% | 2077 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,365 psi | 67% | 2172 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,517 psi | 81% | 2343 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,657 psi | 72% | 2188 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,628 psi | 72% | 2260 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 35,853 psi | 58% | 2129 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 26,049 psi | 42% | 1988 fps | 96.4% |
| Somchem S385 | <<locked>> | 98% | 43,497 psi | 70% | 2293 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 50,923 psi | 82% | 2234 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,484 psi | 73% | 2178 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,191 psi | 66% | 2172 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,742 psi | 67% | 2182 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,142 psi | 55% | 2077 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,329 psi | 52% | 2077 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,862 psi | 75% | 2274 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,103 psi | 65% | 2175 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,894 psi | 51% | 2080 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 90% | 30,560 psi | 49% | 2116 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,269 psi | 49% | 2014 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 46,398 psi | 75% | 2313 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,234 psi | 65% | 2257 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,948 psi | 43% | 2067 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,612 psi | 69% | 2251 fps | 99.6% |
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 117 powders for .375 Ruger loaded with the .375 | 305gr | Hammer Claw Hammer . ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,539 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,539 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (428 MPa), the top charges use 54–90 %, 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, ADI AR 2209, ADI AR 2213 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 Superformance, Alliant Reloder-17 rank at the top here: for .375 Ruger 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, ADI AR 2213, Alliant Reloder-22, Alliant Reloder-25 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.