Load Specifications
Load data in caliber .375 H&H Mag. with .375 | 261gr | SUS-TAC HPT bullet and 96 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>> | 90% | 53,156 psi | 85% | 2516 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,693 psi | 86% | 2598 fps | 98.6% |
| Accurate 2230 | <<locked>> | 82% | 54,375 psi | 87% | 2612 fps | 98.9% |
| Accurate 2460 | <<locked>> | 88% | 55,201 psi | 89% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,432 psi | 86% | 2572 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 52,765 psi | 85% | 2592 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2651 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,756 psi | 67% | 2497 fps | 95.9% |
| Accurate LT-30 | <<locked>> | 84% | 53,867 psi | 86% | 2474 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,288 psi | 87% | 2493 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,463 psi | 89% | 2638 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 55,114 psi | 88% | 2487 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2631 fps | 99% |
| ADI AR 2219 | <<locked>> | 84% | 53,795 psi | 86% | 2579 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,926 psi | 88% | 2602 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 54,389 psi | 87% | 2589 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 52,968 psi | 85% | 2651 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 54,868 psi | 88% | 2736 fps | 98.8% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2651 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,301 psi | 85% | 2526 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 56,347 psi | 90% | 2671 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,815 psi | 69% | 2507 fps | 96% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,095 psi | 79% | 2651 fps | 99% |
| Alliant Reloder-7 | <<locked>> | 82% | 56,217 psi | 90% | 2507 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 56,014 psi | 90% | 2513 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,288 psi | 89% | 2654 fps | 98.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2664 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,114 psi | 87% | 2546 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 53,476 psi | 86% | 2628 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,376 psi | 89% | 2717 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 88% | 55,825 psi | 90% | 2605 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,432 psi | 86% | 2585 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 53,998 psi | 87% | 2628 fps | 97.8% |
| Hodgdon H4198 | <<locked>> | 82% | 55,622 psi | 89% | 2513 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 55,941 psi | 90% | 2651 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,885 psi | 62% | 2402 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,375 psi | 87% | 2677 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,345 psi | 55% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,070 psi | 87% | 2605 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 54,795 psi | 88% | 2638 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 55,883 psi | 90% | 2615 fps | 99.1% |
| IMR 4198 | <<locked>> | 86% | 53,896 psi | 86% | 2490 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 54,172 psi | 87% | 2654 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 92% | 54,926 psi | 88% | 2602 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 55,172 psi | 88% | 2592 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,201 psi | 89% | 2595 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,288 psi | 87% | 2621 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 56,217 psi | 90% | 2579 fps | 99.4% |
| Lovex S062 | <<locked>> | 98% | 54,955 psi | 88% | 2615 fps | 99.8% |
| Norma 200 | <<locked>> | 82% | 53,374 psi | 86% | 2503 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,215 psi | 87% | 2592 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 54,592 psi | 88% | 2602 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,390 psi | 89% | 2661 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 42,409 psi | 68% | 2497 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 98% | 55,869 psi | 90% | 2687 fps | 99.3% |
| Ramshot TAC | <<locked>> | 92% | 55,695 psi | 89% | 2615 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,534 psi | 87% | 2631 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,142 psi | 85% | 2559 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,679 psi | 56% | 1581 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,998 psi | 88% | 2595 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 54,737 psi | 88% | 2608 fps | 96.3% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 56,159 psi | 90% | 2736 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2713 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 55,463 psi | 89% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 54,447 psi | 87% | 2585 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2605 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 55,172 psi | 88% | 2592 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,288 psi | 87% | 2621 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,955 psi | 88% | 2615 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,129 psi | 88% | 2566 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,534 psi | 87% | 2247 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,201 psi | 87% | 2589 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,664 psi | 86% | 2661 fps | 99.1% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,476 psi | 87% | 2546 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,592 psi | 86% | 2589 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,780 psi | 86% | 2612 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,490 psi | 86% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2536 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 56,376 psi | 90% | 2641 fps | 99.9% |
| Somchem S335 | <<locked>> | 94% | 55,521 psi | 89% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 52,924 psi | 85% | 2585 fps | 99% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2608 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,739 psi | 61% | 2448 fps | 98% |
| Vihtavuori N120 | <<locked>> | 82% | 55,027 psi | 88% | 2441 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,476 psi | 86% | 2480 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,316 psi | 85% | 2493 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,316 psi | 85% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,027 psi | 88% | 2579 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2546 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,846 psi | 72% | 2500 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 92% | 55,593 psi | 89% | 2602 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 52,982 psi | 85% | 2575 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,743 psi | 70% | 2503 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,151 psi | 74% | 2490 fps | 98.5% |
| Winchester 748 | <<locked>> | 92% | 54,433 psi | 87% | 2644 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,505 psi | 86% | 2625 fps | 99.5% |
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% | 39,088 psi | 63% | 2310 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,299 psi | 81% | 2549 fps | 98.1% |
| Accurate 2230 | <<locked>> | 80% | 50,705 psi | 81% | 2559 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 42,337 psi | 68% | 2398 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 31,546 psi | 51% | 2221 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 37,521 psi | 60% | 2349 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 29,849 psi | 48% | 2201 fps | 98% |
| Accurate 4350 | <<locked>> | 98% | 38,856 psi | 62% | 2444 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 47,659 psi | 76% | 2388 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,037 psi | 77% | 2405 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 35,824 psi | 57% | 2300 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 51,880 psi | 83% | 2448 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 39,233 psi | 63% | 2356 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 46,963 psi | 75% | 2484 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 37,811 psi | 61% | 2320 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 36,376 psi | 58% | 2329 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,468 psi | 70% | 2497 fps | 98.2% |
| Alliant Power Pro 2000-MR | 63.4 gr | 86% | 39,436 psi | 63% | 2461 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,386 psi | 50% | 2231 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,454 psi | 71% | 2402 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,260 psi | 58% | 2333 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,248 psi | 65% | 2454 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,375 psi | 57% | 2382 fps | 95.4% |
| Alliant Reloder-7 | <<locked>> | 80% | 52,721 psi | 85% | 2464 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,238 psi | 74% | 2382 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 39,610 psi | 64% | 2398 fps | 95.3% |
| Bofors RP3 | <<locked>> | 84% | 32,634 psi | 52% | 2274 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,059 psi | 64% | 2323 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,578 psi | 57% | 2329 fps | 97.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,160 psi | 63% | 2441 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,105 psi | 69% | 2425 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,584 psi | 70% | 2441 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 41,423 psi | 66% | 2425 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 52,460 psi | 84% | 2470 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,056 psi | 58% | 2313 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,418 psi | 55% | 2306 fps | 95.1% |
| Hodgdon LEVERevolution | 57.8 gr | 80% | 32,169 psi | 52% | 2274 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,411 psi | 41% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,925 psi | 56% | 2274 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 34,838 psi | 56% | 2326 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 36,347 psi | 58% | 2290 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 45,295 psi | 73% | 2372 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 34,722 psi | 56% | 2313 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 37,811 psi | 61% | 2320 fps | 97.4% |
| Lovex D073.4 | <<locked>> | 80% | 51,445 psi | 82% | 2543 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,134 psi | 68% | 2398 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 33,881 psi | 54% | 2283 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 36,854 psi | 59% | 2257 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 31,647 psi | 51% | 2205 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 50,082 psi | 80% | 2457 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,186 psi | 56% | 2267 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 35,099 psi | 56% | 2283 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 35,578 psi | 57% | 2323 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 39,784 psi | 64% | 2448 fps | 95% |
| Ramshot Big Game | <<locked>> | 86% | 37,652 psi | 60% | 2382 fps | 95.7% |
| Ramshot TAC | <<locked>> | 86% | 45,803 psi | 73% | 2461 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,608 psi | 59% | 2329 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,133 psi | 66% | 2365 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,643 psi | 41% | 1411 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,496 psi | 68% | 2405 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 51,372 psi | 82% | 2559 fps | 95.6% |
| ReloadSwiss RS 52 | 60 gr | 84% | 37,391 psi | 60% | 2418 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,225 psi | 47% | 2234 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 38,943 psi | 62% | 2323 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 33,620 psi | 54% | 2224 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 32,706 psi | 52% | 2267 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 51,445 psi | 82% | 2543 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,881 psi | 54% | 2283 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 31,647 psi | 51% | 2205 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,846 psi | 72% | 2415 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,880 psi | 83% | 2218 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,398 psi | 76% | 2493 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 36,666 psi | 59% | 2369 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,078 psi | 72% | 2415 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 43,569 psi | 70% | 2431 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 36,825 psi | 59% | 2323 fps | 95.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,956 psi | 59% | 2244 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,168 psi | 48% | 2119 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 40,277 psi | 65% | 2388 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 36,390 psi | 58% | 2247 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 35,201 psi | 56% | 2283 fps | 95.1% |
| Somchem S355 | <<locked>> | 86% | 34,026 psi | 55% | 2280 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 31,401 psi | 50% | 2297 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 51,822 psi | 83% | 2402 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,974 psi | 67% | 2316 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,985 psi | 59% | 2251 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,126 psi | 52% | 2221 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 33,141 psi | 53% | 2224 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 30,342 psi | 49% | 2178 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 98% | 42,061 psi | 67% | 2451 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 37,608 psi | 60% | 2313 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 31,807 psi | 51% | 2211 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 98% | 41,046 psi | 66% | 2454 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 35,636 psi | 57% | 2293 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 36,361 psi | 58% | 2349 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,402 psi | 54% | 2270 fps | 95.3% |
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 96 powders for .375 H&H Mag. loaded with the .375 | 261gr | SUS-TAC HPT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,736 fps. Accurate 4064 gives the best case fill at 100 %, and 96 of the 96 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 261.0 gr projectile in 0.375" calls for a 1:15.5 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 .375 | 261gr | SUS-TAC HPT 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.