Load Specifications
Bullet:.375 | 300gr | Barnes X S
Bullet Manufacturer:Barnes
Bullet Weight:300 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:1:16.5
Load data in caliber .375 H&H Mag. with .375 | 300gr | Barnes X S bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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% | 55,463 psi | 89% | 2336 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,896 psi | 86% | 2359 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,186 psi | 87% | 2362 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,129 psi | 88% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,057 psi | 90% | 2385 fps | 96.5% |
| Accurate 4064 | <<locked>> | 92% | 53,925 psi | 86% | 2402 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2454 fps | 99.1% |
| ADI AR 2206H | <<locked>> | 88% | 53,954 psi | 87% | 2418 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 54,433 psi | 87% | 2415 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 88% | 56,217 psi | 90% | 2418 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,359 psi | 86% | 2359 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,737 psi | 88% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,101 psi | 90% | 2559 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,157 psi | 87% | 2434 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,071 psi | 88% | 2336 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,955 psi | 88% | 2454 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,169 psi | 80% | 2454 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,070 psi | 87% | 2536 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,521 psi | 59% | 2241 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,813 psi | 64% | 2356 fps | 96% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,188 psi | 90% | 2320 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 52,982 psi | 85% | 2428 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 55,056 psi | 88% | 2454 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,303 psi | 89% | 2418 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,085 psi | 88% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,448 psi | 89% | 2451 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,127 psi | 85% | 2484 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 53,606 psi | 86% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,360 psi | 87% | 2395 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,101 psi | 90% | 2461 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,317 psi | 87% | 2493 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 98% | 55,535 psi | 89% | 2461 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 88% | 54,389 psi | 87% | 2428 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,470 psi | 75% | 2352 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 56,246 psi | 90% | 2497 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,448 psi | 89% | 2523 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 57% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,376 psi | 89% | 2428 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,969 psi | 87% | 2411 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,201 psi | 87% | 2402 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,592 psi | 88% | 2382 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 54,665 psi | 88% | 2293 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,503 psi | 83% | 2392 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,519 psi | 86% | 2398 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,950 psi | 78% | 2405 fps | 98.8% |
| IMR 4895 | <<locked>> | 92% | 56,289 psi | 90% | 2480 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 56,217 psi | 90% | 2418 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,751 psi | 86% | 2369 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,476 psi | 86% | 2402 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,853 psi | 86% | 2356 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,114 psi | 87% | 2402 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2441 fps | 98.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2425 fps | 97.3% |
| Norma 201 | <<locked>> | 90% | 56,304 psi | 90% | 2415 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,200 psi | 85% | 2375 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,143 psi | 87% | 2444 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,720 psi | 81% | 2444 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 92% | 54,143 psi | 87% | 2464 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,705 psi | 80% | 2434 fps | 97.3% |
| Ramshot TAC | <<locked>> | 86% | 53,200 psi | 85% | 2392 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,912 psi | 90% | 2454 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,954 psi | 87% | 2379 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,912 psi | 90% | 2402 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 56,159 psi | 90% | 2441 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,665 psi | 88% | 2507 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,998 psi | 87% | 2536 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,807 psi | 81% | 2474 fps | 98.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,401 psi | 82% | 2490 fps | 98.4% |
| Rottweil R 901 | <<locked>> | 86% | 54,839 psi | 88% | 2362 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,737 psi | 86% | 2375 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,694 psi | 88% | 2441 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,303 psi | 89% | 2418 fps | 96.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 56,304 psi | 90% | 2441 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,476 psi | 86% | 2402 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,114 psi | 87% | 2402 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2425 fps | 97.3% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,738 psi | 89% | 2379 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,622 psi | 89% | 2490 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,463 psi | 89% | 2349 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,984 psi | 88% | 2418 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,201 psi | 89% | 2434 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,737 psi | 88% | 2323 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,085 psi | 87% | 2316 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,243 psi | 85% | 2356 fps | 96.9% |
| Somchem S321 | <<locked>> | 84% | 54,143 psi | 87% | 2408 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,027 psi | 87% | 2323 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,143 psi | 87% | 2408 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 55,056 psi | 88% | 2438 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,687 psi | 73% | 2408 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,621 psi | 88% | 2290 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,665 psi | 88% | 2310 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,811 psi | 89% | 2379 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,534 psi | 86% | 2356 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 56,347 psi | 90% | 2421 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,171 psi | 85% | 2438 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 53,534 psi | 86% | 2375 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,940 psi | 88% | 2398 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2448 fps | 98.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,972 psi | 62% | 2306 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2425 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 56,188 psi | 90% | 2461 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 2497 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,822 psi | 53% | 2224 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,100 psi | 88% | 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% | 46,586 psi | 75% | 2221 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,705 psi | 81% | 2320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,350 psi | 65% | 2175 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,585 psi | 73% | 2287 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,676 psi | 80% | 2300 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,116 psi | 61% | 2169 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 35,317 psi | 57% | 2188 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,728 psi | 69% | 2247 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,463 psi | 58% | 2119 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,498 psi | 71% | 2254 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 44,222 psi | 71% | 2244 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,517 psi | 83% | 2421 fps | 99.9% |
| Alliant Power Pro 2000-MR | 57.7 gr | 80% | 38,406 psi | 62% | 2264 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,071 psi | 58% | 2146 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,982 psi | 83% | 2297 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,682 psi | 62% | 2195 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,795 psi | 57% | 2188 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 31,227 psi | 50% | 2113 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,995 psi | 50% | 2113 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,492 psi | 60% | 2306 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,823 psi | 85% | 2280 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,263 psi | 66% | 2247 fps | 97.4% |
| Bofors RP3 | <<locked>> | 80% | 35,926 psi | 58% | 2156 fps | 98.2% |
| Bofors RP7 | <<locked>> | 94% | 49,182 psi | 79% | 2329 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,412 psi | 74% | 2244 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,004 psi | 69% | 2274 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,702 psi | 75% | 2388 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 50,299 psi | 81% | 2329 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,169 psi | 82% | 2352 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,666 psi | 59% | 2149 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 94% | 45,194 psi | 72% | 2356 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 96% | 52,257 psi | 84% | 2415 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 43,033 psi | 69% | 2257 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,428 psi | 47% | 2021 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,696 psi | 62% | 2231 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 96% | 48,573 psi | 78% | 2421 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 43% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,089 psi | 66% | 2215 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 42,351 psi | 68% | 2257 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,261 psi | 61% | 2149 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,803 psi | 73% | 2251 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 51,735 psi | 83% | 2257 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 48,443 psi | 78% | 2346 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,107 psi | 72% | 2270 fps | 95% |
| IMR 4831 | <<locked>> | 88% | 34,243 psi | 55% | 2149 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,508 psi | 63% | 2221 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 44,498 psi | 71% | 2254 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 50,328 psi | 81% | 2326 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,684 psi | 67% | 2234 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,830 psi | 69% | 2192 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 38,421 psi | 62% | 2159 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 39,987 psi | 64% | 2188 fps | 95.3% |
| Lovex S070 | <<locked>> | 94% | 45,092 psi | 72% | 2297 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 42,337 psi | 68% | 2211 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 42,076 psi | 67% | 2218 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,087 psi | 61% | 2188 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 35,708 psi | 57% | 2185 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,159 psi | 60% | 2192 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 41,582 psi | 67% | 2300 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 44,237 psi | 71% | 2254 fps | 96.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,555 psi | 70% | 2274 fps | 98.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,790 psi | 77% | 2290 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,021 psi | 43% | 1312 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,443 psi | 79% | 2316 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 44,193 psi | 71% | 2264 fps | 95.7% |
| ReloadSwiss RS 52 | 56 gr | 80% | 39,827 psi | 64% | 2277 fps | 97.7% |
| ReloadSwiss RS 60 | 56.8 gr | 80% | 33,040 psi | 53% | 2169 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 37,231 psi | 60% | 2244 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,987 psi | 64% | 2293 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 46,644 psi | 75% | 2251 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,393 psi | 65% | 2172 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 33,939 psi | 54% | 2106 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 94% | 49,182 psi | 79% | 2329 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,987 psi | 64% | 2188 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,684 psi | 67% | 2234 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 38,421 psi | 62% | 2159 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 94% | 45,092 psi | 72% | 2297 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,156 psi | 84% | 2333 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,403 psi | 55% | 2142 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,272 psi | 84% | 2310 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,670 psi | 68% | 2234 fps | 96.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,089 psi | 66% | 2221 fps | 98.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,337 psi | 69% | 2165 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,071 psi | 58% | 2060 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,309 psi | 71% | 2228 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 47,776 psi | 77% | 2320 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,120 psi | 69% | 2175 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,090 psi | 67% | 2231 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 34,766 psi | 56% | 2110 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 27,166 psi | 44% | 2014 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 48,704 psi | 78% | 2218 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,381 psi | 70% | 2162 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,334 psi | 63% | 2159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,842 psi | 64% | 2165 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,938 psi | 53% | 2057 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 35,143 psi | 56% | 2139 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,556 psi | 71% | 2251 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 80% | 38,479 psi | 62% | 2159 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,492 psi | 59% | 2188 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 32,822 psi | 53% | 2178 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 31,241 psi | 50% | 2034 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 43,627 psi | 70% | 2287 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 45,324 psi | 73% | 2359 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,024 psi | 50% | 2172 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,234 psi | 65% | 2224 fps | 98.7% |
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 105 powders for .375 H&H Mag. loaded with the .375 | 300gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,559 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,559 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.5 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Barnes X S 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.