Load Specifications
Bullet:.375 | 300gr | Impala RNFP
Bullet Manufacturer:Impala Bullets
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 | Impala RNFP bullet and 106 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 Alliant Reloder-17.
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% | 55,695 psi | 89% | 2339 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,085 psi | 87% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,491 psi | 87% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,492 psi | 89% | 2418 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,217 psi | 90% | 2392 fps | 96.6% |
| Accurate 4064 | <<locked>> | 92% | 54,186 psi | 87% | 2408 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 2464 fps | 99.2% |
| ADI AR 2206H | <<locked>> | 88% | 54,157 psi | 87% | 2425 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 54,650 psi | 88% | 2418 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,171 psi | 85% | 2382 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,447 psi | 86% | 2362 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,984 psi | 88% | 2470 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 56,376 psi | 90% | 2566 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 54,839 psi | 88% | 2434 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,375 psi | 87% | 2438 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,361 psi | 89% | 2339 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,187 psi | 88% | 2457 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2461 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 98% | 54,534 psi | 87% | 2543 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,666 psi | 59% | 2247 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,132 psi | 64% | 2365 fps | 96.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 56,405 psi | 90% | 2323 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,403 psi | 86% | 2434 fps | 99.3% |
| Bofors RP3 | <<locked>> | 94% | 55,317 psi | 89% | 2461 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,564 psi | 89% | 2425 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,071 psi | 88% | 2365 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,666 psi | 89% | 2454 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,388 psi | 86% | 2487 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 53,940 psi | 86% | 2375 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,621 psi | 88% | 2398 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,275 psi | 90% | 2464 fps | 99.2% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2497 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 98% | 55,680 psi | 89% | 2464 fps | 96.2% |
| Hodgdon H4895 | <<locked>> | 88% | 54,665 psi | 88% | 2431 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,659 psi | 75% | 2359 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,127 psi | 85% | 2461 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,811 psi | 89% | 2533 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 57% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,608 psi | 89% | 2431 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,201 psi | 87% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,433 psi | 87% | 2405 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,795 psi | 88% | 2385 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 55,027 psi | 88% | 2300 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2395 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 53,911 psi | 86% | 2405 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,211 psi | 79% | 2411 fps | 98.9% |
| IMR 4895 | <<locked>> | 90% | 53,461 psi | 86% | 2444 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 86% | 53,171 psi | 85% | 2382 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,012 psi | 87% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,737 psi | 86% | 2408 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,012 psi | 87% | 2359 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 54,375 psi | 87% | 2405 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,417 psi | 86% | 2405 fps | 98.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2428 fps | 97.4% |
| Norma 201 | <<locked>> | 88% | 53,490 psi | 86% | 2382 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,374 psi | 86% | 2382 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,360 psi | 87% | 2448 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 50,981 psi | 82% | 2448 fps | 99% |
| Ramshot Big Game | <<locked>> | 92% | 54,302 psi | 87% | 2470 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,111 psi | 80% | 2444 fps | 97.4% |
| Ramshot TAC | <<locked>> | 86% | 53,388 psi | 86% | 2395 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 56,101 psi | 90% | 2457 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,172 psi | 87% | 2382 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,188 psi | 90% | 2408 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,127 psi | 85% | 2402 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,187 psi | 88% | 2516 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,230 psi | 87% | 2543 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,010 psi | 82% | 2477 fps | 98.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2497 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,187 psi | 88% | 2369 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,012 psi | 87% | 2379 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,897 psi | 88% | 2448 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,564 psi | 89% | 2425 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,417 psi | 86% | 2405 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,737 psi | 86% | 2408 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,375 psi | 87% | 2405 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,838 psi | 86% | 2428 fps | 97.4% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 55,999 psi | 90% | 2382 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 56,028 psi | 90% | 2497 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,753 psi | 89% | 2356 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,448 psi | 89% | 2425 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,695 psi | 89% | 2444 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,766 psi | 88% | 2323 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,317 psi | 87% | 2323 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,650 psi | 86% | 2362 fps | 97% |
| Somchem S321 | <<locked>> | 84% | 54,375 psi | 87% | 2415 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,288 psi | 87% | 2329 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,578 psi | 88% | 2415 fps | 99.8% |
| Somchem S355 | <<locked>> | 96% | 55,317 psi | 89% | 2444 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2411 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,868 psi | 88% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,723 psi | 88% | 2310 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,130 psi | 90% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,737 psi | 86% | 2362 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,200 psi | 85% | 2385 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,563 psi | 86% | 2444 fps | 99.2% |
| Vihtavuori N530 | <<locked>> | 86% | 53,766 psi | 86% | 2382 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,143 psi | 88% | 2402 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 2454 fps | 99% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,146 psi | 63% | 2310 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2428 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 56,420 psi | 90% | 2467 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2503 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,040 psi | 53% | 2234 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,347 psi | 89% | 2451 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% | 46,920 psi | 75% | 2228 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,908 psi | 82% | 2323 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,683 psi | 65% | 2182 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,876 psi | 74% | 2290 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,850 psi | 80% | 2303 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,348 psi | 61% | 2175 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 35,549 psi | 57% | 2192 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 42,946 psi | 69% | 2254 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,666 psi | 59% | 2126 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,759 psi | 72% | 2257 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 44,556 psi | 71% | 2251 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,895 psi | 83% | 2428 fps | 99.9% |
| Alliant Power Pro 2000-MR | 58 gr | 80% | 38,551 psi | 62% | 2270 fps | 96.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,395 psi | 70% | 2264 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,332 psi | 58% | 2152 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,243 psi | 84% | 2303 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,899 psi | 62% | 2201 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,839 psi | 57% | 2195 fps | 95.7% |
| Alliant Reloder-17 | 57.1 gr | 80% | 31,386 psi | 50% | 2119 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,154 psi | 50% | 2116 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,608 psi | 60% | 2313 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 53,098 psi | 85% | 2283 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,495 psi | 67% | 2251 fps | 97.5% |
| Bofors RP3 | <<locked>> | 80% | 35,969 psi | 58% | 2156 fps | 98.2% |
| Bofors RP7 | <<locked>> | 94% | 49,371 psi | 79% | 2336 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,485 psi | 75% | 2247 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,265 psi | 69% | 2280 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,978 psi | 75% | 2392 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 50,604 psi | 81% | 2336 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,445 psi | 82% | 2359 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,695 psi | 59% | 2152 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 45,571 psi | 73% | 2362 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 96% | 52,634 psi | 84% | 2421 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,250 psi | 69% | 2264 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,617 psi | 47% | 2028 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,899 psi | 62% | 2238 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 48,660 psi | 78% | 2425 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 43% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,336 psi | 66% | 2221 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 42,467 psi | 68% | 2260 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,493 psi | 62% | 2156 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,832 psi | 73% | 2254 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 51,866 psi | 83% | 2260 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 48,675 psi | 78% | 2352 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,266 psi | 73% | 2274 fps | 95.1% |
| IMR 4831 | <<locked>> | 88% | 34,447 psi | 55% | 2156 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 39,726 psi | 64% | 2228 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 44,759 psi | 72% | 2257 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 50,618 psi | 81% | 2329 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,945 psi | 67% | 2241 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,091 psi | 69% | 2195 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 38,653 psi | 62% | 2165 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 40,219 psi | 64% | 2195 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 45,324 psi | 73% | 2303 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,569 psi | 68% | 2218 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 42,351 psi | 68% | 2224 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,305 psi | 61% | 2192 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 35,708 psi | 57% | 2185 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,304 psi | 60% | 2198 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 41,901 psi | 67% | 2306 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 44,454 psi | 71% | 2260 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,801 psi | 70% | 2280 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,950 psi | 77% | 2297 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,050 psi | 43% | 1316 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,748 psi | 80% | 2323 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,843 psi | 67% | 2224 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,885 psi | 64% | 2280 fps | 97.7% |
| ReloadSwiss RS 60 | 57.1 gr | 80% | 33,214 psi | 53% | 2175 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,244 psi | 57% | 2205 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,176 psi | 64% | 2297 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 46,731 psi | 75% | 2254 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,611 psi | 65% | 2178 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 34,200 psi | 55% | 2113 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 94% | 49,371 psi | 79% | 2336 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,219 psi | 64% | 2195 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,945 psi | 67% | 2241 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,653 psi | 62% | 2165 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 94% | 45,324 psi | 73% | 2303 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,431 psi | 84% | 2339 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,447 psi | 55% | 2142 fps | 96.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,576 psi | 84% | 2316 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,917 psi | 69% | 2241 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,133 psi | 66% | 2224 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,555 psi | 70% | 2172 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,274 psi | 58% | 2067 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,512 psi | 71% | 2234 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 48,037 psi | 77% | 2326 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 43,352 psi | 70% | 2178 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,337 psi | 68% | 2238 fps | 98.5% |
| Somchem S355 | <<locked>> | 80% | 34,940 psi | 56% | 2116 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 27,311 psi | 44% | 2021 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 48,936 psi | 78% | 2221 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,642 psi | 70% | 2169 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,581 psi | 63% | 2165 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,074 psi | 64% | 2169 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,141 psi | 53% | 2064 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 35,143 psi | 56% | 2142 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,614 psi | 72% | 2254 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 38,522 psi | 62% | 2162 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,724 psi | 59% | 2192 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 33,011 psi | 53% | 2182 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,544 psi | 47% | 1995 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 43,874 psi | 70% | 2293 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 45,571 psi | 73% | 2362 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 98% | 31,241 psi | 50% | 2182 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,451 psi | 65% | 2228 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 116 powders for .375 H&H Mag. loaded with the .375 | 300gr | Impala RNFP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,566 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,566 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 51–90 %, 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 3100, Accurate 4350, ADI AR 2209 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, Alliant Reloder-17 rank at the top here: for .375 H&H Mag. with the .375 | 300gr | Impala RNFP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.