Load Specifications
Bullet Manufacturer:Hammer
Bullet Weight:305 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Ruger load data
Case Length (l3):2.572"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:99 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:23"
Max. allowed Pressure:62,076 psi
Recommended Twist Rate:1:17.0
Load data in caliber .375 Ruger with .375 | 305gr | Hammer Stone Hammer bullet and 100 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 ReloadSwiss RS 60.
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: 23"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 84% | 54,781 psi | 88% | 2310 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,316 psi | 86% | 2333 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,172 psi | 89% | 2392 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,173 psi | 90% | 2382 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,451 psi | 65% | 2254 fps | 96.5% |
| Accurate 4064 | <<locked>> | 90% | 53,403 psi | 86% | 2379 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,982 psi | 85% | 2451 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 53,954 psi | 87% | 2405 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 54,810 psi | 88% | 2402 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,040 psi | 85% | 2362 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,679 psi | 86% | 2336 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,388 psi | 86% | 2507 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,708 psi | 88% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,506 psi | 89% | 2444 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,273 psi | 87% | 2497 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,550 psi | 89% | 2530 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,711 psi | 62% | 2280 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,236 psi | 70% | 2415 fps | 98.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,635 psi | 86% | 2418 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 55,390 psi | 89% | 2438 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,492 psi | 89% | 2411 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,650 psi | 88% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,825 psi | 90% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,940 psi | 87% | 2470 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 52,837 psi | 85% | 2405 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 55,883 psi | 90% | 2493 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 53,113 psi | 86% | 2415 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 54,534 psi | 88% | 2415 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,430 psi | 81% | 2388 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,693 psi | 86% | 2441 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,794 psi | 85% | 2477 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,462 psi | 57% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,738 psi | 90% | 2415 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,389 psi | 88% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,418 psi | 88% | 2388 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,404 psi | 88% | 2372 fps | 98.2% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2431 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,012 psi | 87% | 2395 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,534 psi | 86% | 2444 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 53,461 psi | 86% | 2425 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,040 psi | 85% | 2362 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,461 psi | 86% | 2382 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,534 psi | 86% | 2343 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,099 psi | 87% | 2385 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,417 psi | 86% | 2388 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 54,259 psi | 87% | 2421 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 55,985 psi | 90% | 2395 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,171 psi | 86% | 2359 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,708 psi | 88% | 2431 fps | 100% |
| Norma 204 | <<locked>> | 98% | 52,620 psi | 85% | 2428 fps | 96.3% |
| Norma MRPᴾ | <<locked>> | 100% | 43,279 psi | 70% | 2379 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 55,405 psi | 89% | 2480 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 55,201 psi | 89% | 2454 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,331 psi | 88% | 2484 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 53,113 psi | 86% | 2379 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 52,721 psi | 85% | 2395 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,693 psi | 86% | 2362 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 58% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,854 psi | 90% | 2385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,243 psi | 86% | 2388 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,883 psi | 90% | 2497 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,274 psi | 89% | 2526 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2513 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,883 psi | 90% | 2539 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,737 psi | 87% | 2339 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,229 psi | 86% | 2356 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,259 psi | 89% | 2428 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,492 psi | 89% | 2411 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,417 psi | 86% | 2388 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,461 psi | 86% | 2382 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,099 psi | 87% | 2385 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,259 psi | 87% | 2421 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,374 psi | 86% | 2438 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,578 psi | 88% | 2290 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,201 psi | 89% | 2408 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,695 psi | 90% | 2425 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,346 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,331 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,592 psi | 86% | 2349 fps | 98.1% |
| Somchem S321 | <<locked>> | 82% | 53,925 psi | 87% | 2388 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,679 psi | 86% | 2303 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,737 psi | 88% | 2395 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,492 psi | 89% | 2425 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,777 psi | 80% | 2441 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,543 psi | 75% | 2343 fps | 96.3% |
| Vihtavuori N130 | <<locked>> | 82% | 53,969 psi | 87% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,578 psi | 88% | 2290 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 52,953 psi | 85% | 2323 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,780 psi | 87% | 2339 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,548 psi | 86% | 2365 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,694 psi | 88% | 2434 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 53,461 psi | 86% | 2362 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,172 psi | 89% | 2375 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,664 psi | 86% | 2444 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,380 psi | 68% | 2343 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,839 psi | 88% | 2415 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,156 psi | 86% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,883 psi | 90% | 2493 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,664 psi | 56% | 2287 fps | 99.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,724 psi | 90% | 2431 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% | 48,573 psi | 78% | 2238 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,263 psi | 66% | 2182 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,124 psi | 78% | 2306 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,236 psi | 70% | 2198 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 37,724 psi | 61% | 2205 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,015 psi | 63% | 2178 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,487 psi | 49% | 2077 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 44,730 psi | 72% | 2274 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,971 psi | 61% | 2149 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,760 psi | 75% | 2277 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,050 psi | 76% | 2260 fps | 100% |
| Alliant Power Pro 2000-MR | 63.8 gr | 80% | 40,611 psi | 65% | 2303 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,608 psi | 61% | 2169 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,466 psi | 65% | 2221 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,212 psi | 50% | 2090 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,445 psi | 52% | 2146 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,601 psi | 46% | 2054 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 92% | 32,735 psi | 53% | 2201 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,772 psi | 71% | 2277 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 37,217 psi | 60% | 2172 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 43,453 psi | 70% | 2238 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,544 psi | 78% | 2267 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,585 psi | 73% | 2300 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,357 psi | 81% | 2421 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 38,116 psi | 61% | 2175 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 40,161 psi | 65% | 2257 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 46,804 psi | 75% | 2323 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,150 psi | 73% | 2283 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,774 psi | 43% | 1959 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,147 psi | 66% | 2264 fps | 99.7% |
| Hodgdon Superformance | 74.7 gr | 90% | 42,714 psi | 69% | 2320 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 43% | 1299 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,279 psi | 70% | 2241 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 44,904 psi | 72% | 2274 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,871 psi | 64% | 2175 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,467 psi | 68% | 2195 fps | 95.8% |
| IMR 4350 | <<locked>> | 92% | 43,439 psi | 70% | 2257 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,395 psi | 68% | 2221 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 31,807 psi | 51% | 2090 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,437 psi | 67% | 2247 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,760 psi | 75% | 2277 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,845 psi | 71% | 2254 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,802 psi | 72% | 2218 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 39,914 psi | 64% | 2182 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,043 psi | 60% | 2133 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 39,827 psi | 64% | 2201 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,845 psi | 71% | 2234 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 44,092 psi | 71% | 2238 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,827 psi | 64% | 2211 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 49,313 psi | 79% | 2382 fps | 95.5% |
| Norma MRP | <<locked>> | 98% | 40,393 psi | 65% | 2326 fps | 95% |
| Norma URP | <<locked>> | 82% | 31,053 psi | 50% | 2077 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,291 psi | 63% | 2224 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 36,825 psi | 59% | 2201 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 46,659 psi | 75% | 2287 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,166 psi | 74% | 2303 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,328 psi | 81% | 2320 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 43% | 1332 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,446 psi | 84% | 2343 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,551 psi | 62% | 2159 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,409 psi | 68% | 2310 fps | 99% |
| ReloadSwiss RS 60 | 62.8 gr | 80% | 34,505 psi | 56% | 2198 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,489 psi | 52% | 2136 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,969 psi | 56% | 2188 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 47,848 psi | 77% | 2264 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,640 psi | 67% | 2192 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 35,056 psi | 56% | 2126 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 43,453 psi | 70% | 2238 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,043 psi | 60% | 2133 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,845 psi | 71% | 2254 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,914 psi | 64% | 2182 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 39,827 psi | 64% | 2201 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,955 psi | 58% | 2169 fps | 98.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,440 psi | 73% | 2178 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,875 psi | 72% | 2264 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,091 psi | 69% | 2247 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,092 psi | 73% | 2188 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,536 psi | 60% | 2077 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,321 psi | 67% | 2172 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 50,473 psi | 81% | 2343 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,773 psi | 72% | 2188 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,556 psi | 72% | 2260 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 35,969 psi | 58% | 2133 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 26,121 psi | 42% | 1991 fps | 96.4% |
| Somchem S385 | <<locked>> | 98% | 43,627 psi | 70% | 2297 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 50,879 psi | 82% | 2231 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,440 psi | 73% | 2178 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,118 psi | 66% | 2172 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,713 psi | 67% | 2182 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,098 psi | 55% | 2077 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,460 psi | 52% | 2080 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,789 psi | 75% | 2274 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,219 psi | 65% | 2175 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,821 psi | 51% | 2080 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 28,718 psi | 46% | 2073 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,226 psi | 49% | 2014 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 46,557 psi | 75% | 2313 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 40,335 psi | 65% | 2260 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,905 psi | 43% | 2067 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,569 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 100 powders for .375 Ruger loaded with the .375 | 305gr | Hammer Stone 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 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (428 MPa), the top charges use 56–90 %, 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 3100, 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .375 Ruger 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.