Load Specifications
Bullet:.375 | 300gr | Woodleigh HS
Bullet Manufacturer:Woodleigh
Bullet Weight:300 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:1:6.0
Load data in caliber .375 Ruger with .375 | 300gr | Woodleigh HS bullet and 99 powders. The key underlying parameters are shown in the table above.
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% | 53,780 psi | 87% | 2313 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,419 psi | 89% | 2375 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,361 psi | 89% | 2372 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,664 psi | 86% | 2388 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,926 psi | 88% | 2375 fps | 97.3% |
| Accurate 4064 | <<locked>> | 92% | 55,332 psi | 89% | 2415 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,882 psi | 88% | 2487 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 88% | 56,028 psi | 90% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 53,693 psi | 86% | 2402 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,027 psi | 89% | 2402 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,956 psi | 90% | 2375 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,535 psi | 89% | 2546 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,563 psi | 86% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,114 psi | 87% | 2438 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,910 psi | 85% | 2493 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,954 psi | 87% | 2523 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,695 psi | 61% | 2270 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,742 psi | 67% | 2398 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,912 psi | 90% | 2461 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 53,896 psi | 87% | 2431 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,215 psi | 87% | 2405 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,592 psi | 86% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,389 psi | 88% | 2428 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 52,446 psi | 84% | 2464 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 55,782 psi | 90% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,143 psi | 89% | 2444 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 98% | 54,244 psi | 87% | 2487 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 55,187 psi | 89% | 2454 fps | 97% |
| Hodgdon H4895 | <<locked>> | 86% | 53,127 psi | 86% | 2408 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2385 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,985 psi | 90% | 2484 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,143 psi | 89% | 2520 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 57% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,418 psi | 88% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,040 psi | 85% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,055 psi | 85% | 2385 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,403 psi | 86% | 2369 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2428 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 52,837 psi | 85% | 2388 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,895 psi | 84% | 2434 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 55,492 psi | 89% | 2464 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,027 psi | 89% | 2402 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,361 psi | 89% | 2388 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,738 psi | 90% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,622 psi | 90% | 2379 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 52,968 psi | 85% | 2382 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,259 psi | 89% | 2425 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 52,765 psi | 85% | 2411 fps | 98% |
| Norma 201 | <<locked>> | 88% | 54,839 psi | 88% | 2398 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,405 psi | 89% | 2398 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,287 psi | 86% | 2428 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,926 psi | 88% | 2467 fps | 96.4% |
| Norma URPᴾ | <<locked>> | 100% | 53,969 psi | 87% | 2477 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 53,592 psi | 86% | 2448 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,779 psi | 85% | 2474 fps | 98.7% |
| Ramshot TAC | <<locked>> | 86% | 55,405 psi | 89% | 2421 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,984 psi | 89% | 2434 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,956 psi | 90% | 2402 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,810 psi | 58% | 1493 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,708 psi | 88% | 2385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,376 psi | 89% | 2428 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,259 psi | 87% | 2493 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,838 psi | 87% | 2523 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,375 psi | 88% | 2507 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,418 psi | 88% | 2533 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,956 psi | 90% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,259 psi | 89% | 2395 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,766 psi | 87% | 2425 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,215 psi | 87% | 2405 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,259 psi | 89% | 2425 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,738 psi | 90% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 52,968 psi | 85% | 2382 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 52,765 psi | 85% | 2411 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,434 psi | 89% | 2477 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,838 psi | 87% | 2402 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,375 psi | 88% | 2418 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,200 psi | 86% | 2303 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,229 psi | 86% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,999 psi | 90% | 2388 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 52,750 psi | 85% | 2385 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,724 psi | 90% | 2339 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,403 psi | 86% | 2392 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 54,085 psi | 87% | 2421 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,341 psi | 78% | 2434 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 53,040 psi | 85% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,417 psi | 86% | 2290 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,955 psi | 89% | 2362 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,869 psi | 90% | 2379 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,738 psi | 90% | 2405 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,069 psi | 85% | 2428 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 55,579 psi | 90% | 2398 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,838 psi | 87% | 2375 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,564 psi | 90% | 2480 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,828 psi | 66% | 2333 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,447 psi | 86% | 2411 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,405 psi | 89% | 2441 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,476 psi | 88% | 2487 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,634 psi | 54% | 2267 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,375 psi | 88% | 2428 fps | 100% |
Start Load - Barrel Length: 23"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 47,413 psi | 76% | 2238 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,996 psi | 84% | 2336 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,074 psi | 65% | 2178 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,905 psi | 76% | 2303 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,237 psi | 73% | 2241 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 37,913 psi | 61% | 2175 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,676 psi | 51% | 2113 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 43,671 psi | 70% | 2270 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,231 psi | 60% | 2146 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,745 psi | 74% | 2274 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,919 psi | 74% | 2260 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,653 psi | 64% | 2297 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,651 psi | 59% | 2162 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,436 psi | 64% | 2215 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,300 psi | 52% | 2123 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,647 psi | 51% | 2136 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,588 psi | 48% | 2087 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,055 psi | 55% | 2238 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,743 psi | 69% | 2274 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 36,172 psi | 58% | 2165 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 45,121 psi | 73% | 2274 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,529 psi | 77% | 2264 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,498 psi | 72% | 2297 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,907 psi | 79% | 2415 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,185 psi | 84% | 2349 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,144 psi | 60% | 2169 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 90% | 41,655 psi | 67% | 2297 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 48,602 psi | 78% | 2362 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 44,063 psi | 71% | 2277 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,833 psi | 45% | 1995 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,900 psi | 64% | 2254 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 44,628 psi | 72% | 2362 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,266 psi | 42% | 1302 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,250 psi | 68% | 2238 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 43,642 psi | 70% | 2270 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,073 psi | 63% | 2172 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,553 psi | 67% | 2188 fps | 95.2% |
| IMR 4350 | <<locked>> | 94% | 45,107 psi | 73% | 2293 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,495 psi | 67% | 2215 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 32,880 psi | 53% | 2123 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 40,364 psi | 65% | 2241 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 45,745 psi | 74% | 2274 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 51,692 psi | 83% | 2346 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,714 psi | 69% | 2251 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,830 psi | 71% | 2215 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 38,899 psi | 63% | 2175 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 36,158 psi | 58% | 2126 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 41,263 psi | 66% | 2238 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 42,772 psi | 69% | 2228 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 43,004 psi | 69% | 2234 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,798 psi | 63% | 2205 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 51,387 psi | 83% | 2421 fps | 95.6% |
| Norma URP | <<locked>> | 84% | 32,227 psi | 52% | 2116 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 38,276 psi | 62% | 2218 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 38,305 psi | 62% | 2241 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 45,542 psi | 73% | 2280 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,933 psi | 72% | 2297 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,342 psi | 79% | 2316 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1332 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,314 psi | 83% | 2343 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,118 psi | 65% | 2198 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,191 psi | 66% | 2300 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,678 psi | 54% | 2192 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,721 psi | 54% | 2175 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 36,434 psi | 59% | 2228 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 46,688 psi | 75% | 2260 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,828 psi | 66% | 2192 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,171 psi | 55% | 2119 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 45,121 psi | 73% | 2274 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,158 psi | 58% | 2126 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,714 psi | 69% | 2251 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,899 psi | 63% | 2175 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 41,263 psi | 66% | 2238 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,998 psi | 56% | 2159 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,830 psi | 71% | 2260 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,090 psi | 68% | 2244 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,280 psi | 71% | 2188 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,753 psi | 59% | 2077 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,931 psi | 69% | 2208 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 49,342 psi | 79% | 2343 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,787 psi | 71% | 2188 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,540 psi | 70% | 2257 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 34,983 psi | 56% | 2126 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 25,396 psi | 41% | 1982 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 49,951 psi | 80% | 2234 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,541 psi | 72% | 2182 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,190 psi | 65% | 2172 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,843 psi | 66% | 2182 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,344 psi | 54% | 2073 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 33,736 psi | 54% | 2116 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 45,701 psi | 74% | 2270 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,233 psi | 63% | 2175 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,069 psi | 53% | 2119 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 29,631 psi | 48% | 2106 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,544 psi | 48% | 2008 fps | 96.2% |
| Winchester 748 | <<locked>> | 80% | 45,397 psi | 73% | 2310 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,814 psi | 67% | 2297 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,833 psi | 45% | 2100 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,524 psi | 67% | 2247 fps | 99.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 99 powders for .375 Ruger loaded with the .375 | 300gr | Woodleigh HS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,546 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,546 fps. Accurate 4350 gives the best case fill at 100 %, and 99 of the 99 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 300.0 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-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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.