Load Specifications
Bullet Manufacturer:A-Square
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 | A-Square MONO RN 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.
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>> | 82% | 54,215 psi | 87% | 2346 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 53,055 psi | 85% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,520 psi | 88% | 2425 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,361 psi | 89% | 2418 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,627 psi | 70% | 2339 fps | 97.6% |
| Accurate 4064 | <<locked>> | 88% | 53,243 psi | 86% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,055 psi | 85% | 2490 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 53,185 psi | 86% | 2438 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,259 psi | 87% | 2438 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2467 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,550 psi | 89% | 2434 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 53,301 psi | 86% | 2369 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 52,736 psi | 85% | 2539 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,039 psi | 82% | 2467 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,563 psi | 88% | 2461 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,897 psi | 88% | 2477 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,070 psi | 87% | 2539 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,201 psi | 89% | 2566 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,270 psi | 81% | 2461 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,350 psi | 67% | 2362 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,528 psi | 75% | 2513 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,011 psi | 85% | 2451 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 55,042 psi | 89% | 2470 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,114 psi | 89% | 2451 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,780 psi | 87% | 2375 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,027 psi | 89% | 2461 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,898 psi | 90% | 2484 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 55,767 psi | 90% | 2536 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 52,866 psi | 85% | 2454 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 84% | 53,780 psi | 87% | 2444 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,838 psi | 87% | 2470 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,287 psi | 86% | 2474 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,272 psi | 84% | 2516 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 58% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,955 psi | 89% | 2448 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,027 psi | 87% | 2428 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,867 psi | 87% | 2425 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,563 psi | 86% | 2408 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 55,288 psi | 89% | 2474 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,592 psi | 86% | 2434 fps | 98.3% |
| IMR 4831 | <<locked>> | 98% | 53,374 psi | 86% | 2480 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 52,852 psi | 85% | 2457 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,550 psi | 89% | 2434 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,156 psi | 86% | 2415 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,086 psi | 90% | 2415 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,693 psi | 86% | 2418 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,011 psi | 85% | 2428 fps | 99.2% |
| Lovex S070 | <<locked>> | 96% | 53,867 psi | 87% | 2457 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 55,361 psi | 89% | 2431 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,956 psi | 90% | 2431 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,114 psi | 87% | 2464 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,014 psi | 90% | 2520 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 46,195 psi | 74% | 2470 fps | 97.2% |
| Norma URP | <<locked>> | 98% | 55,463 psi | 89% | 2523 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 54,621 psi | 88% | 2487 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,157 psi | 87% | 2523 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 55,767 psi | 90% | 2457 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,448 psi | 89% | 2470 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 58% | 1529 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,043 psi | 90% | 2470 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,564 psi | 90% | 2536 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,114 psi | 89% | 2566 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 52,518 psi | 85% | 2507 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,695 psi | 90% | 2582 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 53,040 psi | 85% | 2372 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,941 psi | 90% | 2431 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,926 psi | 88% | 2464 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,052 psi | 79% | 2448 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 55,114 psi | 89% | 2451 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,011 psi | 85% | 2428 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,156 psi | 86% | 2415 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,693 psi | 86% | 2418 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,867 psi | 87% | 2457 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,127 psi | 86% | 2474 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,259 psi | 87% | 2438 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,114 psi | 89% | 2457 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,476 psi | 86% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,708 psi | 87% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,026 psi | 85% | 2385 fps | 98.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,588 psi | 78% | 2441 fps | 96.2% |
| Somchem S335 | <<locked>> | 86% | 56,130 psi | 90% | 2372 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,056 psi | 87% | 2431 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,143 psi | 89% | 2461 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2523 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,632 psi | 80% | 2428 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 84% | 53,824 psi | 87% | 2320 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,840 psi | 90% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,156 psi | 86% | 2372 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 53,069 psi | 85% | 2398 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,491 psi | 88% | 2477 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 56,159 psi | 90% | 2434 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,708 psi | 88% | 2411 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 53,403 psi | 86% | 2480 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,759 psi | 74% | 2431 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,462 psi | 88% | 2454 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 52,634 psi | 85% | 2434 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,767 psi | 90% | 2536 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,130 psi | 60% | 2385 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,042 psi | 89% | 2464 fps | 100% |
Start Load - Barrel Length: 23"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 50,865 psi | 82% | 2306 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,685 psi | 70% | 2247 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,908 psi | 82% | 2379 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,656 psi | 69% | 2231 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 35,549 psi | 57% | 2198 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 41,321 psi | 67% | 2247 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,472 psi | 49% | 2103 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 46,934 psi | 76% | 2349 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,885 psi | 64% | 2221 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 98% | 48,008 psi | 77% | 2418 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,008 psi | 79% | 2349 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,792 psi | 80% | 2326 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,902 psi | 69% | 2385 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 44,918 psi | 72% | 2372 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,827 psi | 64% | 2241 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,612 psi | 69% | 2297 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,966 psi | 50% | 2119 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,447 psi | 55% | 2228 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,195 psi | 76% | 2415 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,876 psi | 43% | 2041 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,808 psi | 53% | 2241 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,267 psi | 75% | 2356 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 39,552 psi | 64% | 2247 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 43,018 psi | 69% | 2270 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,763 psi | 82% | 2336 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,138 psi | 78% | 2372 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,263 psi | 65% | 2251 fps | 97.8% |
| Hodgdon H414 | <<locked>> | 86% | 39,958 psi | 64% | 2290 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 43,598 psi | 70% | 2313 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,427 psi | 76% | 2356 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,355 psi | 46% | 2031 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,598 psi | 70% | 2339 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,293 psi | 68% | 2356 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 43% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,455 psi | 73% | 2313 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,500 psi | 77% | 2346 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,901 psi | 68% | 2247 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,440 psi | 72% | 2270 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 40,625 psi | 65% | 2251 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,320 psi | 63% | 2205 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 31,749 psi | 51% | 2119 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 43,685 psi | 70% | 2323 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 49,008 psi | 79% | 2349 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,470 psi | 75% | 2329 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,775 psi | 75% | 2290 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,003 psi | 68% | 2254 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,505 psi | 56% | 2116 fps | 95.1% |
| Lovex S070 | <<locked>> | 86% | 39,552 psi | 64% | 2234 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 45,977 psi | 74% | 2303 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,427 psi | 75% | 2306 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,989 psi | 68% | 2287 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 45,905 psi | 74% | 2372 fps | 95% |
| Norma MRP | <<locked>> | 96% | 40,466 psi | 65% | 2369 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 30,864 psi | 50% | 2106 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 41,684 psi | 67% | 2300 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 36,695 psi | 59% | 2238 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 48,878 psi | 79% | 2362 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,646 psi | 78% | 2379 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 43% | 1368 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,596 psi | 65% | 2234 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,194 psi | 73% | 2388 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,651 psi | 59% | 2280 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,445 psi | 52% | 2169 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 34,592 psi | 56% | 2218 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 50,053 psi | 81% | 2333 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,787 psi | 71% | 2264 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,231 psi | 60% | 2198 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 98% | 45,861 psi | 74% | 2395 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 43,018 psi | 69% | 2270 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,505 psi | 56% | 2116 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,470 psi | 75% | 2329 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,003 psi | 68% | 2254 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 39,552 psi | 64% | 2234 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,130 psi | 61% | 2244 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,442 psi | 76% | 2343 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,426 psi | 73% | 2323 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,152 psi | 76% | 2254 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,407 psi | 63% | 2142 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,435 psi | 62% | 2159 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,440 psi | 73% | 2392 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 46,847 psi | 75% | 2257 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,137 psi | 76% | 2336 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,942 psi | 61% | 2201 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 27,760 psi | 45% | 2070 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 40,872 psi | 66% | 2287 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 47,558 psi | 77% | 2244 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,468 psi | 70% | 2241 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,947 psi | 71% | 2251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,100 psi | 58% | 2146 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 32,184 psi | 52% | 2110 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 49,182 psi | 79% | 2346 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,337 psi | 68% | 2244 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,720 psi | 51% | 2110 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 86% | 28,892 psi | 47% | 2106 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,923 psi | 51% | 2090 fps | 97.8% |
| Winchester 748 | <<locked>> | 80% | 49,139 psi | 79% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,074 psi | 65% | 2293 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,934 psi | 43% | 2106 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,063 psi | 73% | 2326 fps | 99.9% |
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 | A-Square MONO RN. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,582 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,582 fps. Accurate 3100 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 58–90 %, 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 3100, ADI AR 2209, Alliant Power Pro Varmint 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.