Load Specifications
Load data in caliber .375 Weath. Mag. with .375 | 250gr | CutEdge Maximus 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% | 56,579 psi | 89% | 2684 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,840 psi | 89% | 2782 fps | 99.3% |
| Accurate 2460 | <<locked>> | 86% | 54,998 psi | 86% | 2710 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 57,290 psi | 90% | 2743 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 56,739 psi | 89% | 2769 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 56,811 psi | 89% | 2779 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,730 psi | 72% | 2687 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 84% | 56,594 psi | 89% | 2635 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 57,000 psi | 89% | 2657 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,564 psi | 87% | 2772 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 56,623 psi | 89% | 2766 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 57,406 psi | 90% | 2753 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,085 psi | 86% | 2733 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 54,940 psi | 86% | 2713 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,637 psi | 89% | 2835 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,390 psi | 87% | 2884 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,825 psi | 87% | 2789 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,507 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,768 psi | 89% | 2808 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,774 psi | 72% | 2694 fps | 97.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,953 psi | 83% | 2848 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,738 psi | 87% | 2635 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,666 psi | 87% | 2789 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 56,188 psi | 88% | 2802 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 57,276 psi | 90% | 2720 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 57,580 psi | 90% | 2812 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,651 psi | 87% | 2851 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 55,767 psi | 87% | 2733 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,116 psi | 90% | 2759 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,143 psi | 85% | 2759 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 92% | 56,072 psi | 88% | 2782 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,785 psi | 65% | 2582 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,897 psi | 86% | 2815 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,577 psi | 54% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,273 psi | 85% | 2740 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 55,477 psi | 87% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,188 psi | 88% | 2753 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,927 psi | 89% | 2733 fps | 96.7% |
| IMR 4198 | <<locked>> | 86% | 56,956 psi | 89% | 2651 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,941 psi | 88% | 2749 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,642 psi | 68% | 2631 fps | 97% |
| IMR 4895 | <<locked>> | 94% | 54,534 psi | 85% | 2789 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 55,085 psi | 86% | 2733 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 54,911 psi | 86% | 2717 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,781 psi | 86% | 2753 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,014 psi | 88% | 2710 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 55,259 psi | 87% | 2746 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2684 fps | 97% |
| Norma 200 | <<locked>> | 82% | 56,246 psi | 88% | 2664 fps | 100% |
| Norma 201 | <<locked>> | 94% | 57,667 psi | 90% | 2769 fps | 100% |
| Norma 202 | <<locked>> | 92% | 54,795 psi | 86% | 2730 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,854 psi | 88% | 2795 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 45,832 psi | 72% | 2684 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 96% | 56,492 psi | 89% | 2825 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 55,622 psi | 87% | 2746 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,665 psi | 86% | 2766 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,478 psi | 89% | 2736 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,809 psi | 55% | 1683 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,665 psi | 86% | 2717 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,911 psi | 86% | 2743 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,927 psi | 89% | 2874 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,513 psi | 71% | 2703 fps | 97% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2726 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 90% | 55,027 psi | 86% | 2707 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,607 psi | 86% | 2717 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2789 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,995 psi | 80% | 2684 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,781 psi | 86% | 2753 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,259 psi | 87% | 2746 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,781 psi | 86% | 2690 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,797 psi | 89% | 2392 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 57,740 psi | 90% | 2762 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,462 psi | 85% | 2802 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,624 psi | 90% | 2713 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 57,305 psi | 90% | 2772 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 57,624 psi | 90% | 2795 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,637 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,275 psi | 88% | 2667 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 56,405 psi | 88% | 2769 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,506 psi | 87% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,927 psi | 89% | 2769 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,405 psi | 88% | 2785 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,611 psi | 64% | 2628 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 88% | 56,362 psi | 88% | 2641 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,550 psi | 89% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 57,290 psi | 90% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,259 psi | 87% | 2707 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2726 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2687 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 90% | 55,564 psi | 87% | 2733 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 56,855 psi | 89% | 2749 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,442 psi | 74% | 2687 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,530 psi | 78% | 2674 fps | 99.4% |
| Winchester 748 | <<locked>> | 90% | 54,940 psi | 86% | 2779 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 57,406 psi | 90% | 2805 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% | 41,176 psi | 65% | 2461 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 53,142 psi | 83% | 2726 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 44,744 psi | 70% | 2556 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,301 psi | 52% | 2365 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,074 psi | 63% | 2510 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 31,517 psi | 49% | 2346 fps | 98.7% |
| Accurate 4350 | <<locked>> | 96% | 39,523 psi | 62% | 2572 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 49,908 psi | 78% | 2543 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,285 psi | 79% | 2566 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,985 psi | 60% | 2464 fps | 96.7% |
| ADI AR 2208 | <<locked>> | 84% | 36,709 psi | 58% | 2421 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 49,995 psi | 78% | 2654 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,030 psi | 63% | 2484 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 39,015 psi | 61% | 2484 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,398 psi | 73% | 2674 fps | 99% |
| Alliant Power Pro 2000-MR | 70.6 gr | 84% | 39,247 psi | 62% | 2582 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,299 psi | 49% | 2336 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,876 psi | 73% | 2559 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 36,201 psi | 57% | 2448 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,014 psi | 60% | 2533 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,967 psi | 52% | 2444 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,979 psi | 77% | 2543 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,912 psi | 58% | 2461 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 30,400 psi | 48% | 2326 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,076 psi | 66% | 2480 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,043 psi | 60% | 2493 fps | 98.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,974 psi | 66% | 2621 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 45,730 psi | 72% | 2585 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,470 psi | 73% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 41,481 psi | 65% | 2546 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 38,232 psi | 60% | 2477 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,416 psi | 51% | 2379 fps | 95% |
| Hodgdon LEVERevolution | 65.9 gr | 80% | 34,171 psi | 54% | 2438 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,628 psi | 40% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,927 psi | 58% | 2434 fps | 96.9% |
| IMR 3031 | <<locked>> | 80% | 37,260 psi | 58% | 2484 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 36,143 psi | 57% | 2405 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 90% | 50,343 psi | 79% | 2631 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 47,790 psi | 75% | 2530 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,443 psi | 77% | 2648 fps | 95% |
| IMR 4831 | <<locked>> | 96% | 38,247 psi | 60% | 2526 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 34,621 psi | 54% | 2425 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 40,030 psi | 63% | 2484 fps | 98.3% |
| Lovex D073.5 | <<locked>> | 80% | 44,672 psi | 70% | 2566 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 36,158 psi | 57% | 2444 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 38,812 psi | 61% | 2418 fps | 96.9% |
| Lovex S062 | <<locked>> | 80% | 33,446 psi | 52% | 2356 fps | 96.7% |
| Lovex S065 | <<locked>> | 96% | 45,194 psi | 71% | 2589 fps | 95.7% |
| Norma 200 | <<locked>> | 80% | 52,663 psi | 83% | 2618 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,999 psi | 58% | 2421 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 37,260 psi | 58% | 2441 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 33,243 psi | 52% | 2382 fps | 95.1% |
| Norma URP | <<locked>> | 96% | 40,277 psi | 63% | 2575 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 82% | 35,056 psi | 55% | 2444 fps | 95.4% |
| Ramshot TAC | <<locked>> | 82% | 42,656 psi | 67% | 2530 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,972 psi | 61% | 2497 fps | 96.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,323 psi | 68% | 2526 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,788 psi | 40% | 1503 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,962 psi | 70% | 2569 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 48,312 psi | 76% | 2641 fps | 95.6% |
| ReloadSwiss RS 52 | 66.8 gr | 82% | 37,463 psi | 59% | 2539 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,906 psi | 45% | 2339 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,610 psi | 62% | 2592 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,671 psi | 68% | 2664 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 40,596 psi | 64% | 2474 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 35,186 psi | 55% | 2375 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 84% | 32,648 psi | 51% | 2375 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 45,194 psi | 71% | 2589 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,158 psi | 57% | 2444 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 33,446 psi | 52% | 2356 fps | 96.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,616 psi | 75% | 2585 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,882 psi | 84% | 2359 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,415 psi | 79% | 2664 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 34,229 psi | 54% | 2428 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,877 psi | 75% | 2579 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,538 psi | 64% | 2500 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,463 psi | 57% | 2431 fps | 96.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,957 psi | 61% | 2398 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,908 psi | 50% | 2267 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 42,917 psi | 67% | 2559 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 38,261 psi | 60% | 2398 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 37,594 psi | 59% | 2448 fps | 96.4% |
| Somchem S355 | <<locked>> | 82% | 31,821 psi | 50% | 2339 fps | 95.1% |
| Somchem S365 | <<locked>> | 90% | 29,414 psi | 46% | 2359 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 44,280 psi | 69% | 2470 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,146 psi | 61% | 2402 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,287 psi | 54% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,186 psi | 55% | 2379 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 28,210 psi | 44% | 2231 fps | 95.2% |
| Vihtavuori N160 | <<locked>> | 94% | 39,668 psi | 62% | 2526 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 39,929 psi | 63% | 2477 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 80% | 33,823 psi | 53% | 2365 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 94% | 38,711 psi | 61% | 2526 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,214 psi | 52% | 2359 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 38,812 psi | 61% | 2513 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,607 psi | 56% | 2434 fps | 96.6% |
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 Weath. Mag. loaded with the .375 | 250gr | CutEdge Maximus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,910 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,910 fps. Accurate 4350 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 (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.375" calls for a 1:17.0 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 52, Hodgdon LEVERevolution rank at the top here: for .375 Weath. Mag. with the .375 | 250gr | CutEdge Maximus 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.