Load Specifications
Bullet Manufacturer:Impala Bullets
Bullet Weight:270 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:1:6.0
Load data in caliber .375 H&H Mag. with .375 | 270gr | Impala RNFP KO bullet and 100 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 60 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% | 53,664 psi | 86% | 2467 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,332 psi | 89% | 2533 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,376 psi | 89% | 2533 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,214 psi | 85% | 2543 fps | 100% |
| Accurate 4064 | <<locked>> | 94% | 54,824 psi | 88% | 2572 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,603 psi | 80% | 2575 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 55,651 psi | 89% | 2451 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,970 psi | 90% | 2470 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,332 psi | 89% | 2589 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 96% | 55,840 psi | 90% | 2582 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 56,362 psi | 90% | 2562 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,505 psi | 87% | 2549 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 88% | 54,389 psi | 87% | 2533 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,144 psi | 90% | 2644 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,085 psi | 87% | 2684 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,564 psi | 89% | 2608 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,359 psi | 86% | 2470 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,011 psi | 85% | 2579 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,457 psi | 78% | 2572 fps | 98.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,492 psi | 89% | 2707 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,143 psi | 56% | 2336 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,636 psi | 88% | 2451 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,592 psi | 88% | 2602 fps | 99% |
| Bofors RP3 | <<locked>> | 96% | 56,217 psi | 90% | 2625 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,434 psi | 90% | 2533 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,519 psi | 86% | 2579 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,752 psi | 88% | 2661 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 84% | 55,143 psi | 88% | 2546 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,014 psi | 90% | 2572 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 53,969 psi | 87% | 2582 fps | 98.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,243 psi | 84% | 2612 fps | 96% |
| Hodgdon H4895 | <<locked>> | 90% | 55,767 psi | 89% | 2602 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,744 psi | 72% | 2467 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,230 psi | 87% | 2628 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,288 psi | 57% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,461 psi | 86% | 2556 fps | 99.7% |
| IMR 3031 | <<locked>> | 90% | 55,245 psi | 89% | 2589 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,492 psi | 89% | 2569 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,159 psi | 90% | 2549 fps | 96.6% |
| IMR 4198 | <<locked>> | 84% | 56,246 psi | 90% | 2467 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,056 psi | 88% | 2562 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,978 psi | 75% | 2520 fps | 97.8% |
| IMR 4895 | <<locked>> | 92% | 54,273 psi | 87% | 2608 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 88% | 54,505 psi | 87% | 2549 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 84% | 55,230 psi | 89% | 2543 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,882 psi | 88% | 2575 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,332 psi | 89% | 2523 fps | 99.6% |
| Lovex S062 | <<locked>> | 94% | 55,550 psi | 89% | 2572 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,317 psi | 87% | 2562 fps | 97.6% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,793 psi | 83% | 2543 fps | 96% |
| Norma 201 | <<locked>> | 90% | 54,563 psi | 87% | 2546 fps | 99.9% |
| Norma 202 | <<locked>> | 90% | 54,607 psi | 88% | 2549 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,593 psi | 89% | 2615 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 48,849 psi | 78% | 2562 fps | 98% |
| Ramshot Big Game | <<locked>> | 94% | 55,637 psi | 89% | 2638 fps | 99.6% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,124 psi | 77% | 2552 fps | 95.9% |
| Ramshot TAC | <<locked>> | 88% | 54,853 psi | 88% | 2562 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,012 psi | 87% | 2582 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,651 psi | 89% | 2549 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,824 psi | 57% | 1572 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,157 psi | 87% | 2536 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,491 psi | 87% | 2566 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,086 psi | 90% | 2684 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,709 psi | 89% | 2717 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,776 psi | 78% | 2589 fps | 97.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,530 psi | 79% | 2602 fps | 97.1% |
| Rottweil R 901 | <<locked>> | 86% | 53,301 psi | 85% | 2497 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,071 psi | 88% | 2546 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,072 psi | 90% | 2615 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,317 psi | 87% | 2562 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,882 psi | 88% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,550 psi | 89% | 2572 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,793 psi | 83% | 2543 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,911 psi | 86% | 2507 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,577 psi | 86% | 2618 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,664 psi | 86% | 2484 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,359 psi | 86% | 2543 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 53,519 psi | 86% | 2562 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,130 psi | 90% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,564 psi | 89% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,694 psi | 88% | 2516 fps | 96.3% |
| Somchem S321 | <<locked>> | 86% | 55,709 psi | 89% | 2582 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,390 psi | 89% | 2493 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,840 psi | 90% | 2582 fps | 99.6% |
| Somchem S355 | <<locked>> | 98% | 56,289 psi | 90% | 2608 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,888 psi | 70% | 2523 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 56,014 psi | 90% | 2461 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,941 psi | 90% | 2477 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,969 psi | 87% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,766 psi | 88% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,433 psi | 87% | 2549 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,314 psi | 82% | 2562 fps | 98.2% |
| Vihtavuori N530 | <<locked>> | 88% | 55,143 psi | 88% | 2549 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 56,260 psi | 90% | 2569 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,343 psi | 81% | 2566 fps | 98% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,420 psi | 60% | 2408 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2546 fps | 99.6% |
| Winchester 748 | <<locked>> | 88% | 54,128 psi | 87% | 2592 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,460 psi | 84% | 2615 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,084 psi | 85% | 2572 fps | 99.7% |
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% | 45,136 psi | 72% | 2349 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,863 psi | 78% | 2444 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,754 psi | 62% | 2293 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,034 psi | 71% | 2408 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 36,535 psi | 59% | 2280 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 38,203 psi | 61% | 2379 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 52,402 psi | 84% | 2408 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,765 psi | 85% | 2428 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,321 psi | 66% | 2362 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 35,273 psi | 57% | 2224 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 52,808 psi | 85% | 2516 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,076 psi | 69% | 2372 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 42,453 psi | 68% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,705 psi | 80% | 2549 fps | 99.5% |
| Alliant Power Pro 2000-MR | 60.8 gr | 80% | 37,072 psi | 59% | 2365 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,766 psi | 56% | 2251 fps | 96.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,473 psi | 81% | 2434 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,318 psi | 60% | 2303 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 92% | 38,595 psi | 62% | 2382 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 34,069 psi | 55% | 2310 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,286 psi | 53% | 2290 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,314 psi | 82% | 2408 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,769 psi | 64% | 2356 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 34,461 psi | 55% | 2257 fps | 96.9% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,005 psi | 72% | 2362 fps | 99.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,495 psi | 67% | 2388 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,904 psi | 72% | 2503 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 48,660 psi | 78% | 2461 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,487 psi | 79% | 2484 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 39,784 psi | 64% | 2346 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 98% | 49,255 psi | 79% | 2566 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,597 psi | 67% | 2372 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 33,591 psi | 54% | 2244 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,289 psi | 60% | 2339 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 42% | 1368 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,784 psi | 64% | 2326 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 40,698 psi | 65% | 2379 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,956 psi | 59% | 2257 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 88% | 49,850 psi | 80% | 2454 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 50,227 psi | 81% | 2392 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 49,139 psi | 79% | 2474 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 36,999 psi | 59% | 2336 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 38,087 psi | 61% | 2333 fps | 97% |
| IMR 8208 XBR | <<locked>> | 80% | 43,076 psi | 69% | 2372 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 48,602 psi | 78% | 2451 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 40,103 psi | 64% | 2349 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 41,597 psi | 67% | 2306 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 37,072 psi | 59% | 2267 fps | 97.9% |
| Lovex S065 | <<locked>> | 92% | 43,294 psi | 69% | 2385 fps | 95.2% |
| Lovex S070 | <<locked>> | 98% | 48,863 psi | 78% | 2497 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 40,872 psi | 66% | 2326 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 40,756 psi | 65% | 2339 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 36,724 psi | 59% | 2293 fps | 96.5% |
| Norma URP | <<locked>> | 92% | 38,508 psi | 62% | 2375 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 35,810 psi | 57% | 2297 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 98% | 45,237 psi | 73% | 2500 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 42,975 psi | 69% | 2369 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,076 psi | 67% | 2388 fps | 97.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,282 psi | 74% | 2411 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 43% | 1404 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,008 psi | 77% | 2448 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 48,196 psi | 77% | 2467 fps | 95.6% |
| ReloadSwiss RS 52 | 58.9 gr | 80% | 38,174 psi | 61% | 2385 fps | 96.3% |
| ReloadSwiss RS 60 | 59.9 gr | 80% | 31,995 psi | 51% | 2267 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,379 psi | 65% | 2441 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 43,729 psi | 70% | 2497 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 45,121 psi | 72% | 2372 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,102 psi | 63% | 2283 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 32,677 psi | 52% | 2208 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 43,294 psi | 69% | 2385 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,103 psi | 64% | 2349 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 37,072 psi | 59% | 2267 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 98% | 48,863 psi | 78% | 2497 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,589 psi | 81% | 2457 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 35,143 psi | 56% | 2287 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,691 psi | 81% | 2444 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,263 psi | 66% | 2346 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,566 psi | 63% | 2329 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,105 psi | 68% | 2287 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,940 psi | 56% | 2172 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 51,430 psi | 82% | 2470 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 46,166 psi | 74% | 2441 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 41,698 psi | 67% | 2293 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,596 psi | 65% | 2343 fps | 97.4% |
| Somchem S355 | <<locked>> | 80% | 33,431 psi | 54% | 2211 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 29,283 psi | 47% | 2195 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 47,355 psi | 76% | 2349 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,090 psi | 67% | 2287 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,942 psi | 61% | 2277 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,493 psi | 62% | 2280 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 31,749 psi | 51% | 2159 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 37,942 psi | 61% | 2329 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 43,033 psi | 69% | 2365 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 37,072 psi | 59% | 2270 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 39,624 psi | 64% | 2382 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 98% | 35,360 psi | 57% | 2365 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 33,939 psi | 54% | 2218 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 42,119 psi | 68% | 2408 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 49,255 psi | 79% | 2566 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,899 psi | 62% | 2336 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 100 powders for .375 H&H Mag. loaded with the .375 | 270gr | Impala RNFP KO. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,717 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,717 fps. Accurate 4350 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 270.0 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-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 60, ReloadSwiss RS 52 rank at the top here: for .375 H&H Mag. with the .375 | 270gr | Impala RNFP KO 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.