Load Specifications
Load data in caliber .375 H&H Mag. with .376 | 270gr | Peregrine VLR-4 bullet and 98 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.
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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>> | 92% | 55,622 psi | 89% | 2500 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 52,982 psi | 85% | 2543 fps | 98.7% |
| Accurate 2230 | <<locked>> | 82% | 53,432 psi | 86% | 2552 fps | 99% |
| Accurate 2460 | <<locked>> | 88% | 54,157 psi | 87% | 2526 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 55,303 psi | 89% | 2549 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 55,579 psi | 89% | 2582 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 55,042 psi | 88% | 2589 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 40,567 psi | 65% | 2438 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 84% | 53,200 psi | 85% | 2418 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 53,621 psi | 86% | 2438 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 54,752 psi | 88% | 2582 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 54,331 psi | 87% | 2431 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 55,550 psi | 89% | 2575 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 84% | 53,185 psi | 85% | 2526 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,215 psi | 87% | 2546 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 53,447 psi | 86% | 2530 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 55,637 psi | 89% | 2641 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 54,317 psi | 87% | 2680 fps | 98.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 54,317 psi | 87% | 2592 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 55,709 psi | 89% | 2507 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 55,550 psi | 89% | 2615 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,076 psi | 67% | 2454 fps | 96.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,095 psi | 77% | 2592 fps | 99.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 55,201 psi | 89% | 2448 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 55,419 psi | 89% | 2461 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 54,433 psi | 87% | 2595 fps | 98.7% |
| Bofors RP3ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2608 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 53,316 psi | 85% | 2490 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 94% | 56,231 psi | 90% | 2618 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 54,621 psi | 88% | 2657 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 88% | 55,027 psi | 88% | 2549 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 56,275 psi | 90% | 2575 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 52,910 psi | 85% | 2566 fps | 97.9% |
| Hodgdon H4198 | <<locked>> | 82% | 55,158 psi | 88% | 2457 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 55,245 psi | 89% | 2595 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,043 psi | 61% | 2349 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 53,447 psi | 86% | 2618 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,069 psi | 55% | 1506 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 53,519 psi | 86% | 2552 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 53,969 psi | 87% | 2579 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 55,056 psi | 88% | 2559 fps | 99.2% |
| IMR 4198 | <<locked>> | 86% | 53,330 psi | 86% | 2434 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 53,272 psi | 85% | 2595 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 92% | 54,215 psi | 87% | 2546 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 54,085 psi | 87% | 2533 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 54,012 psi | 87% | 2533 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 53,243 psi | 85% | 2562 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 55,274 psi | 89% | 2520 fps | 99.4% |
| Lovex S062 | <<locked>> | 98% | 54,201 psi | 87% | 2559 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2451 fps | 95.8% |
| Norma 200 | <<locked>> | 84% | 55,695 psi | 89% | 2487 fps | 100% |
| Norma 201 | <<locked>> | 94% | 53,287 psi | 85% | 2533 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 53,577 psi | 86% | 2539 fps | 100% |
| Norma 203B | <<locked>> | 98% | 54,549 psi | 87% | 2602 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 41,597 psi | 67% | 2441 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 98% | 55,085 psi | 88% | 2628 fps | 99.4% |
| Ramshot TAC | <<locked>> | 92% | 54,969 psi | 88% | 2559 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 92% | 53,795 psi | 86% | 2575 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 90% | 55,927 psi | 90% | 2552 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,389 psi | 55% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,201 psi | 87% | 2536 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 53,838 psi | 86% | 2549 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 55,158 psi | 88% | 2674 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 51,488 psi | 83% | 2654 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 54,186 psi | 87% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 53,519 psi | 86% | 2530 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 50,604 psi | 81% | 2546 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 54,085 psi | 87% | 2533 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 46,920 psi | 75% | 2451 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 53,243 psi | 85% | 2562 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,201 psi | 87% | 2559 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 54,128 psi | 87% | 2507 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,128 psi | 87% | 2198 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 53,374 psi | 86% | 2533 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2605 fps | 99.2% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 53,664 psi | 86% | 2487 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 56,333 psi | 90% | 2582 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 52,982 psi | 85% | 2556 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 56,014 psi | 90% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 55,390 psi | 89% | 2484 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 55,492 psi | 89% | 2582 fps | 100% |
| Somchem S335 | <<locked>> | 94% | 54,665 psi | 88% | 2487 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 55,724 psi | 89% | 2579 fps | 99.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2549 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 36,898 psi | 59% | 2392 fps | 98% |
| Vihtavuori N120 | <<locked>> | 82% | 54,244 psi | 87% | 2385 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 55,753 psi | 89% | 2461 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 55,767 psi | 89% | 2477 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 55,840 psi | 90% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 54,143 psi | 87% | 2523 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,850 psi | 80% | 2490 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 43,947 psi | 70% | 2444 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 92% | 54,882 psi | 88% | 2546 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 55,709 psi | 89% | 2562 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 42,786 psi | 69% | 2448 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 45,469 psi | 73% | 2438 fps | 98.5% |
| Winchester 748 | <<locked>> | 92% | 53,563 psi | 86% | 2585 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 56,362 psi | 90% | 2615 fps | 99.8% |
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% | 38,087 psi | 61% | 2254 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 49,516 psi | 79% | 2490 fps | 98.2% |
| Accurate 2230 | <<locked>> | 80% | 49,879 psi | 80% | 2500 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 41,220 psi | 66% | 2339 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 30,153 psi | 48% | 2159 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 36,492 psi | 59% | 2290 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 28,558 psi | 46% | 2139 fps | 97.8% |
| Accurate 4350 | <<locked>> | 98% | 37,811 psi | 61% | 2385 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 47,079 psi | 75% | 2336 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 47,456 psi | 76% | 2352 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 35,070 psi | 56% | 2251 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 51,242 psi | 82% | 2395 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 36,071 psi | 58% | 2254 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 46,398 psi | 74% | 2431 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,086 psi | 59% | 2267 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 80% | 35,549 psi | 57% | 2277 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 42,670 psi | 68% | 2441 fps | 98.3% |
| Alliant Power Pro 2000-MR | 62 gr | 86% | 38,551 psi | 62% | 2402 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 30,414 psi | 49% | 2172 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 43,526 psi | 70% | 2346 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 35,389 psi | 57% | 2277 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 39,436 psi | 63% | 2402 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 34,476 psi | 55% | 2326 fps | 95.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 51,953 psi | 83% | 2408 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,716 psi | 73% | 2333 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 38,812 psi | 62% | 2343 fps | 95.4% |
| Bofors RP3 | <<locked>> | 84% | 31,604 psi | 51% | 2215 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,378 psi | 63% | 2270 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 34,693 psi | 56% | 2274 fps | 97.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 38,450 psi | 62% | 2388 fps | 96% |
| Hodgdon H322 | <<locked>> | 80% | 42,264 psi | 68% | 2369 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 42,844 psi | 69% | 2388 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 40,567 psi | 65% | 2369 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 51,880 psi | 83% | 2418 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 35,259 psi | 57% | 2260 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 33,591 psi | 54% | 2254 fps | 95.2% |
| Hodgdon LEVERevolution | 56.6 gr | 80% | 31,372 psi | 50% | 2218 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,309 psi | 41% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,084 psi | 55% | 2221 fps | 95.8% |
| IMR 3031 | <<locked>> | 80% | 33,982 psi | 54% | 2270 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 35,534 psi | 57% | 2238 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 44,744 psi | 72% | 2320 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 33,823 psi | 54% | 2257 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 37,086 psi | 59% | 2267 fps | 97.5% |
| Lovex D073.4 | <<locked>> | 80% | 50,502 psi | 81% | 2487 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 40,915 psi | 66% | 2339 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 32,822 psi | 53% | 2228 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 36,158 psi | 58% | 2208 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 30,690 psi | 49% | 2149 fps | 95.6% |
| Lovex S065 | <<locked>> | 98% | 43,961 psi | 70% | 2402 fps | 95% |
| Norma 200 | <<locked>> | 80% | 48,965 psi | 79% | 2402 fps | 100% |
| Norma 201 | <<locked>> | 80% | 34,185 psi | 55% | 2211 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 34,258 psi | 55% | 2228 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 34,722 psi | 56% | 2267 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 39,102 psi | 63% | 2395 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 36,680 psi | 59% | 2323 fps | 95.8% |
| Ramshot TAC | <<locked>> | 86% | 45,078 psi | 72% | 2408 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 35,824 psi | 57% | 2277 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 40,190 psi | 64% | 2310 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,324 psi | 41% | 1375 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 41,640 psi | 67% | 2349 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 47,224 psi | 76% | 2454 fps | 95% |
| ReloadSwiss RS 52 | 58.8 gr | 84% | 36,637 psi | 59% | 2362 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,456 psi | 46% | 2178 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 37,724 psi | 60% | 2264 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 32,430 psi | 52% | 2165 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 31,676 psi | 51% | 2211 fps | 95.2% |
| Shooters World AR Plus | <<locked>> | 80% | 50,502 psi | 81% | 2487 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 43,961 psi | 70% | 2402 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 32,822 psi | 53% | 2228 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 30,690 psi | 49% | 2149 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,121 psi | 71% | 2362 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,401 psi | 82% | 2169 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 46,659 psi | 75% | 2441 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 35,694 psi | 57% | 2310 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,324 psi | 71% | 2362 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 42,670 psi | 68% | 2379 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 33,707 psi | 54% | 2221 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,114 psi | 58% | 2192 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,356 psi | 47% | 2067 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 39,436 psi | 63% | 2336 fps | 98.4% |
| Somchem S335 | <<locked>> | 80% | 35,491 psi | 57% | 2195 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 34,418 psi | 55% | 2231 fps | 95.1% |
| Somchem S355 | <<locked>> | 86% | 33,098 psi | 53% | 2224 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 30,400 psi | 49% | 2238 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 51,242 psi | 82% | 2349 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,133 psi | 66% | 2264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,201 psi | 58% | 2198 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,198 psi | 50% | 2169 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 32,358 psi | 52% | 2172 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 84% | 29,457 psi | 47% | 2126 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 98% | 41,263 psi | 66% | 2398 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 36,883 psi | 59% | 2264 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 80% | 31,053 psi | 50% | 2159 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 40,016 psi | 64% | 2398 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 34,882 psi | 56% | 2244 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 35,549 psi | 57% | 2293 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 32,590 psi | 52% | 2218 fps | 95.4% |
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 98 powders for .375 H&H Mag. loaded with the .376 | 270gr | Peregrine VLR-4. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,680 fps. Accurate 4064 gives the best case fill at 100 %, and 98 of the 98 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 0.376" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, ADI AR 2208 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 .376 | 270gr | Peregrine VLR-4 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.