Load Specifications
Bullet Manufacturer:Woodleigh
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 | Woodleigh PP SN bullet and 103 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% | 53,214 psi | 85% | 2510 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,882 psi | 88% | 2575 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,288 psi | 87% | 2569 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 52,968 psi | 85% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,462 psi | 87% | 2562 fps | 96% |
| Accurate 4064 | <<locked>> | 94% | 54,041 psi | 87% | 2608 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,676 psi | 80% | 2625 fps | 98.6% |
| Accurate LT-30 | <<locked>> | 82% | 55,796 psi | 89% | 2497 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,217 psi | 90% | 2523 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,448 psi | 89% | 2641 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 94% | 53,113 psi | 85% | 2592 fps | 99.3% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,766 psi | 88% | 2598 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 54,940 psi | 88% | 2579 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 56,434 psi | 90% | 2697 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,737 psi | 88% | 2746 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,854 psi | 90% | 2657 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,304 psi | 90% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,374 psi | 86% | 2631 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,762 psi | 78% | 2628 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 52,837 psi | 85% | 2720 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,505 psi | 55% | 2375 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,955 psi | 88% | 2497 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,274 psi | 89% | 2657 fps | 99.4% |
| Bofors RP3 | <<locked>> | 94% | 52,939 psi | 85% | 2628 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,650 psi | 86% | 2592 fps | 96.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,519 psi | 86% | 2543 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,664 psi | 86% | 2628 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,564 psi | 89% | 2717 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 55,506 psi | 89% | 2595 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 52,881 psi | 85% | 2575 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,056 psi | 87% | 2635 fps | 98.8% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2674 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 90% | 55,941 psi | 90% | 2651 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,889 psi | 72% | 2520 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,911 psi | 88% | 2680 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,346 psi | 87% | 2707 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 56% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,954 psi | 87% | 2608 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 55,521 psi | 89% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,956 psi | 90% | 2621 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 92% | 56,391 psi | 90% | 2605 fps | 97.2% |
| IMR 4198 | <<locked>> | 82% | 53,287 psi | 85% | 2474 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,434 psi | 89% | 2621 fps | 97% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,268 psi | 76% | 2572 fps | 98.3% |
| IMR 4895 | <<locked>> | 92% | 54,708 psi | 88% | 2661 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 54,766 psi | 88% | 2598 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 54,868 psi | 88% | 2585 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,766 psi | 88% | 2621 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,579 psi | 89% | 2579 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 55,434 psi | 89% | 2618 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,418 psi | 87% | 2612 fps | 98.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2592 fps | 96.7% |
| Norma 201 | <<locked>> | 90% | 54,201 psi | 87% | 2592 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,636 psi | 88% | 2595 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,912 psi | 90% | 2667 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2615 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 94% | 56,434 psi | 90% | 2694 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2608 fps | 96.7% |
| Ramshot TAC | <<locked>> | 88% | 55,187 psi | 88% | 2615 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,360 psi | 87% | 2631 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,898 psi | 90% | 2602 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,476 psi | 57% | 1604 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,389 psi | 87% | 2585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,810 psi | 88% | 2618 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,345 psi | 86% | 2690 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,405 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,110 psi | 79% | 2641 fps | 98.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,038 psi | 80% | 2667 fps | 98% |
| Rottweil R 901 | <<locked>> | 88% | 55,317 psi | 89% | 2575 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,592 psi | 88% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,072 psi | 90% | 2661 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 53,650 psi | 86% | 2592 fps | 96.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,418 psi | 87% | 2612 fps | 98.2% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,766 psi | 88% | 2621 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,434 psi | 89% | 2618 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2592 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,085 psi | 87% | 2556 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,375 psi | 87% | 2674 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,911 psi | 86% | 2533 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,258 psi | 85% | 2592 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 53,940 psi | 86% | 2618 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,304 psi | 90% | 2539 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,883 psi | 90% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2569 fps | 96.9% |
| Somchem S321 | <<locked>> | 86% | 56,057 psi | 90% | 2635 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,274 psi | 89% | 2536 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 52,707 psi | 85% | 2585 fps | 99.6% |
| Somchem S355 | <<locked>> | 96% | 53,185 psi | 85% | 2615 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,976 psi | 71% | 2572 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 56,086 psi | 90% | 2507 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,289 psi | 90% | 2526 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,882 psi | 86% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,172 psi | 88% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,650 psi | 88% | 2595 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,895 psi | 83% | 2615 fps | 98.8% |
| Vihtavuori N530 | <<locked>> | 88% | 55,245 psi | 89% | 2598 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,301 psi | 85% | 2575 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,734 psi | 81% | 2618 fps | 98.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,825 psi | 59% | 2448 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2602 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 54,578 psi | 88% | 2641 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2674 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,621 psi | 86% | 2625 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% | 44,222 psi | 71% | 2385 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,066 psi | 77% | 2484 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,724 psi | 59% | 2306 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,279 psi | 69% | 2444 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 51,010 psi | 82% | 2510 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 34,693 psi | 56% | 2297 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 35,070 psi | 56% | 2362 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 52,460 psi | 84% | 2454 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,837 psi | 85% | 2477 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,683 psi | 65% | 2402 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 34,635 psi | 56% | 2264 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,685 psi | 68% | 2411 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 42,221 psi | 68% | 2408 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,632 psi | 80% | 2595 fps | 99.7% |
| Alliant Power Pro 2000-MR | 65.2 gr | 80% | 36,680 psi | 59% | 2411 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,910 psi | 54% | 2280 fps | 97.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,879 psi | 80% | 2470 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,521 psi | 59% | 2336 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,955 psi | 58% | 2375 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 82% | 31,198 psi | 50% | 2290 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 32,489 psi | 52% | 2326 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,474 psi | 83% | 2454 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,494 psi | 63% | 2398 fps | 96.6% |
| Bofors RP3 | <<locked>> | 80% | 33,170 psi | 53% | 2277 fps | 97% |
| Bofors RP7 | <<locked>> | 96% | 50,415 psi | 81% | 2543 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,556 psi | 71% | 2405 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,017 psi | 66% | 2428 fps | 99.4% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,962 psi | 72% | 2552 fps | 98.5% |
| Hodgdon H322 | <<locked>> | 80% | 48,689 psi | 78% | 2503 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,559 psi | 79% | 2530 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 39,044 psi | 63% | 2382 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 96% | 46,441 psi | 74% | 2569 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 40,973 psi | 66% | 2411 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,908 psi | 50% | 2231 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,767 psi | 59% | 2379 fps | 98% |
| Hodgdon Superformance | <<locked>> | 98% | 50,546 psi | 81% | 2648 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,020 psi | 42% | 1398 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,421 psi | 63% | 2369 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 40,147 psi | 64% | 2411 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,318 psi | 58% | 2293 fps | 96.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,876 psi | 75% | 2457 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 50,401 psi | 81% | 2438 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 46,340 psi | 74% | 2477 fps | 95% |
| IMR 4831 | <<locked>> | 92% | 36,434 psi | 58% | 2375 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 37,362 psi | 60% | 2365 fps | 97.3% |
| IMR 8208 XBR | <<locked>> | 80% | 42,685 psi | 68% | 2411 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 47,892 psi | 77% | 2490 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,189 psi | 63% | 2382 fps | 99.7% |
| Lovex S060 | <<locked>> | 80% | 41,118 psi | 66% | 2346 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 36,071 psi | 58% | 2297 fps | 98.1% |
| Lovex S065 | <<locked>> | 90% | 40,147 psi | 64% | 2379 fps | 95% |
| Lovex S070 | <<locked>> | 96% | 45,687 psi | 73% | 2497 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 39,769 psi | 64% | 2359 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 39,987 psi | 64% | 2372 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,911 psi | 58% | 2326 fps | 96.8% |
| Norma URP | <<locked>> | 90% | 35,795 psi | 57% | 2369 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 35,302 psi | 57% | 2336 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 96% | 42,569 psi | 68% | 2503 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 42,554 psi | 68% | 2411 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,800 psi | 67% | 2431 fps | 98.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,079 psi | 74% | 2454 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 42% | 1430 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,892 psi | 77% | 2490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 45,136 psi | 72% | 2467 fps | 95.6% |
| ReloadSwiss RS 52 | 63.2 gr | 80% | 37,811 psi | 61% | 2425 fps | 96.7% |
| ReloadSwiss RS 60 | 64.2 gr | 80% | 31,154 psi | 50% | 2300 fps | 97.8% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 37,507 psi | 60% | 2431 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,930 psi | 66% | 2497 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 43,700 psi | 70% | 2405 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,985 psi | 61% | 2316 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 31,256 psi | 50% | 2228 fps | 96% |
| Rottweil R 907 | <<locked>> | 96% | 50,415 psi | 81% | 2543 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,147 psi | 64% | 2379 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,189 psi | 63% | 2382 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 36,071 psi | 58% | 2297 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 96% | 45,687 psi | 73% | 2497 fps | 95.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,633 psi | 81% | 2507 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,387 psi | 52% | 2274 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,778 psi | 81% | 2490 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,553 psi | 65% | 2382 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,160 psi | 63% | 2372 fps | 97.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,510 psi | 67% | 2326 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,258 psi | 55% | 2205 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 48,312 psi | 77% | 2474 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 45,788 psi | 73% | 2484 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 40,857 psi | 66% | 2326 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,219 psi | 64% | 2382 fps | 97.8% |
| Somchem S355 | <<locked>> | 80% | 32,271 psi | 52% | 2238 fps | 96.1% |
| Somchem S365 | <<locked>> | 86% | 28,181 psi | 45% | 2218 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 46,963 psi | 75% | 2388 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,698 psi | 67% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,115 psi | 60% | 2310 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,768 psi | 61% | 2313 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 30,661 psi | 49% | 2182 fps | 97% |
| Vihtavuori N160 | <<locked>> | 90% | 37,507 psi | 60% | 2369 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 42,540 psi | 68% | 2405 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 80% | 36,332 psi | 58% | 2300 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 90% | 36,724 psi | 59% | 2372 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 34,577 psi | 55% | 2395 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,183 psi | 50% | 2205 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 41,727 psi | 67% | 2448 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 46,630 psi | 75% | 2569 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,348 psi | 61% | 2372 fps | 98% |
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 103 powders for .375 H&H Mag. loaded with the .375 | 270gr | Woodleigh PP SN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,772 fps; across all powders the maximum-charge window runs from 1,568 fps to 2,772 fps. Accurate 4350 gives the best case fill at 100 %, and 103 of the 103 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 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-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 | 270gr | Woodleigh PP SN 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.