Load Specifications
Bullet:.375 | 300gr | Atomic 29 HP
Bullet Manufacturer:Atomic 29
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:1:16.0
Load data in caliber .375 H&H Mag. with .375 | 300gr | Atomic 29 HP bullet and 104 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, ReloadSwiss RS 52 and Hodgdon LEVERevolution.
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>> | 90% | 56,333 psi | 90% | 2369 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 54,911 psi | 88% | 2398 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 53,287 psi | 85% | 2385 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 52,750 psi | 85% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 54,708 psi | 88% | 2385 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 53,026 psi | 85% | 2421 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,339 psi | 73% | 2388 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 53,287 psi | 85% | 2287 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,737 psi | 86% | 2306 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,448 psi | 89% | 2457 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 98% | 56,405 psi | 90% | 2454 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 53,592 psi | 86% | 2388 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,969 psi | 88% | 2421 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 54,723 psi | 88% | 2395 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 52,881 psi | 85% | 2464 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,085 psi | 88% | 2562 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,666 psi | 89% | 2470 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,420 psi | 90% | 2372 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 52,910 psi | 85% | 2448 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,469 psi | 73% | 2398 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,417 psi | 84% | 2530 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,521 psi | 89% | 2326 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,259 psi | 89% | 2474 fps | 99.5% |
| Bofors RP3 | <<locked>> | 98% | 55,738 psi | 89% | 2484 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2408 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,722 psi | 86% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,447 psi | 86% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,376 psi | 89% | 2530 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 55,738 psi | 89% | 2415 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,142 psi | 85% | 2398 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,983 psi | 87% | 2451 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,153 psi | 79% | 2438 fps | 96.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,172 psi | 87% | 2457 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 92% | 55,956 psi | 90% | 2467 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,582 psi | 67% | 2297 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,752 psi | 88% | 2497 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,606 psi | 55% | 1430 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,114 psi | 87% | 2428 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 55,245 psi | 89% | 2448 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,927 psi | 90% | 2438 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,359 psi | 86% | 2379 fps | 96.9% |
| IMR 4198 | <<locked>> | 84% | 53,780 psi | 86% | 2300 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,724 psi | 89% | 2441 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,337 psi | 69% | 2339 fps | 97.9% |
| IMR 4895 | <<locked>> | 94% | 54,273 psi | 87% | 2474 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 54,969 psi | 88% | 2421 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 54,853 psi | 88% | 2408 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,476 psi | 87% | 2438 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,738 psi | 89% | 2395 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 55,027 psi | 88% | 2434 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2385 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 47,993 psi | 77% | 2365 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 56,115 psi | 90% | 2346 fps | 100% |
| Norma 201 | <<locked>> | 92% | 54,114 psi | 87% | 2411 fps | 100% |
| Norma 202 | <<locked>> | 92% | 54,549 psi | 87% | 2415 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,622 psi | 89% | 2480 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 45,440 psi | 73% | 2385 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 96% | 56,188 psi | 90% | 2507 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 44,991 psi | 72% | 2379 fps | 96.2% |
| Ramshot TAC | <<locked>> | 90% | 55,434 psi | 89% | 2438 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,491 psi | 87% | 2451 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,246 psi | 90% | 2425 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,795 psi | 56% | 1463 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,621 psi | 88% | 2405 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,737 psi | 88% | 2438 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 52,852 psi | 85% | 2503 fps | 99.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2579 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,194 psi | 72% | 2408 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,369 psi | 74% | 2428 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 90% | 54,839 psi | 88% | 2392 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,404 psi | 87% | 2405 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,376 psi | 89% | 2470 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2408 fps | 96.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2385 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,476 psi | 87% | 2438 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,027 psi | 88% | 2434 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 47,993 psi | 77% | 2365 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,505 psi | 87% | 2382 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,896 psi | 86% | 2402 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,143 psi | 87% | 2490 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,331 psi | 87% | 2356 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,316 psi | 85% | 2415 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,838 psi | 86% | 2434 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,391 psi | 90% | 2359 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,159 psi | 90% | 2359 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,169 psi | 82% | 2346 fps | 96.5% |
| Somchem S321 | <<locked>> | 88% | 56,057 psi | 90% | 2451 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,390 psi | 89% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 52,924 psi | 85% | 2408 fps | 99.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,086 psi | 90% | 2474 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,393 psi | 65% | 2343 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 88% | 56,318 psi | 90% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,333 psi | 90% | 2346 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,534 psi | 86% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,172 psi | 88% | 2395 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2415 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,138 psi | 77% | 2385 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 90% | 55,434 psi | 89% | 2418 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,084 psi | 85% | 2395 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2388 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2379 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 54,708 psi | 88% | 2461 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 49,385 psi | 79% | 2441 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,577 psi | 86% | 2444 fps | 99.9% |
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% | 41,263 psi | 66% | 2175 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 44,715 psi | 72% | 2264 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,330 psi | 53% | 2100 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,059 psi | 64% | 2228 fps | 99.9% |
| Accurate 2700 | <<locked>> | 92% | 51,184 psi | 82% | 2339 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 31,604 psi | 51% | 2087 fps | 99.4% |
| Accurate 4350 | <<locked>> | 92% | 34,113 psi | 55% | 2195 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 50,125 psi | 80% | 2247 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,531 psi | 81% | 2267 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,014 psi | 61% | 2192 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 32,387 psi | 52% | 2064 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 50,053 psi | 80% | 2346 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,118 psi | 64% | 2201 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 39,073 psi | 63% | 2198 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,514 psi | 75% | 2372 fps | 99.6% |
| Alliant Power Pro 2000-MR | 57.2 gr | 80% | 34,214 psi | 55% | 2198 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,299 psi | 50% | 2077 fps | 96.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,905 psi | 75% | 2257 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,895 psi | 54% | 2129 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 35,665 psi | 57% | 2211 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 84% | 30,821 psi | 49% | 2133 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,805 psi | 78% | 2247 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,767 psi | 59% | 2185 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 30,284 psi | 49% | 2070 fps | 96.5% |
| Bofors RP7 | <<locked>> | 98% | 50,038 psi | 80% | 2362 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,032 psi | 67% | 2195 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,029 psi | 61% | 2215 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,872 psi | 67% | 2329 fps | 98.1% |
| Hodgdon H322 | <<locked>> | 80% | 45,774 psi | 73% | 2290 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,296 psi | 74% | 2310 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,216 psi | 58% | 2172 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 98% | 45,934 psi | 74% | 2388 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 98% | 50,705 psi | 81% | 2408 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 38,290 psi | 61% | 2201 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,371 psi | 49% | 2073 fps | 95.4% |
| Hodgdon LEVERevolution | 56 gr | 80% | 34,069 psi | 55% | 2169 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,686 psi | 41% | 1273 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,927 psi | 59% | 2162 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 37,130 psi | 60% | 2198 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,910 psi | 54% | 2090 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,079 psi | 75% | 2290 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 47,819 psi | 77% | 2228 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,311 psi | 74% | 2306 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 33,373 psi | 54% | 2159 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 34,664 psi | 56% | 2156 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 40,118 psi | 64% | 2201 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 44,628 psi | 72% | 2274 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 36,172 psi | 58% | 2172 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 38,798 psi | 62% | 2142 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 33,431 psi | 54% | 2093 fps | 97.8% |
| Lovex S065 | <<locked>> | 92% | 39,755 psi | 64% | 2211 fps | 95.3% |
| Lovex S070 | <<locked>> | 98% | 45,121 psi | 72% | 2320 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 52,765 psi | 85% | 2310 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,086 psi | 59% | 2152 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 37,260 psi | 60% | 2162 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,286 psi | 53% | 2119 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 35,172 psi | 56% | 2201 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 32,750 psi | 53% | 2126 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 98% | 42,177 psi | 68% | 2329 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 39,914 psi | 64% | 2201 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,885 psi | 62% | 2218 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,395 psi | 70% | 2244 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,759 psi | 41% | 1302 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,976 psi | 72% | 2274 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,148 psi | 68% | 2251 fps | 95.1% |
| ReloadSwiss RS 52 | 55.4 gr | 80% | 34,882 psi | 56% | 2208 fps | 96.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,863 psi | 46% | 2090 fps | 97.3% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 36,854 psi | 59% | 2260 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 40,567 psi | 65% | 2323 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 40,727 psi | 65% | 2192 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 35,186 psi | 56% | 2110 fps | 98.1% |
| Rottweil R 903 | <<locked>> | 80% | 28,572 psi | 46% | 2024 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 98% | 50,038 psi | 80% | 2362 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 39,755 psi | 64% | 2211 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,172 psi | 58% | 2172 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 33,431 psi | 54% | 2093 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 98% | 45,121 psi | 72% | 2320 fps | 95.5% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,674 psi | 76% | 2290 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,241 psi | 81% | 2356 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 31,995 psi | 51% | 2116 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,790 psi | 77% | 2274 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 37,710 psi | 60% | 2172 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,492 psi | 59% | 2162 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,856 psi | 62% | 2119 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,821 psi | 51% | 2008 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 44,628 psi | 72% | 2254 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 42,728 psi | 69% | 2267 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 38,334 psi | 61% | 2126 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,420 psi | 60% | 2175 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 29,791 psi | 48% | 2034 fps | 95.6% |
| Somchem S365 | <<locked>> | 88% | 27,514 psi | 44% | 2060 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 44,164 psi | 71% | 2178 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,044 psi | 63% | 2119 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,200 psi | 55% | 2103 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,215 psi | 56% | 2110 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 28,224 psi | 45% | 1985 fps | 96.5% |
| Vihtavuori N160 | <<locked>> | 90% | 34,809 psi | 56% | 2159 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 39,813 psi | 64% | 2195 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 33,692 psi | 54% | 2100 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 36,027 psi | 58% | 2205 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 30,966 psi | 50% | 2054 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 38,914 psi | 62% | 2234 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 46,151 psi | 74% | 2392 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,650 psi | 57% | 2165 fps | 97.7% |
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 104 powders for .375 H&H Mag. loaded with the .375 | 300gr | Atomic 29 HP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,579 fps; across all powders the maximum-charge window runs from 1,430 fps to 2,579 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Atomic 29 HP 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.