Load Specifications
Load data in caliber .375 Rem. Ultra Mag. with .374 | 250gr | Frontier BTSP 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 Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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>> | 84% | 57,000 psi | 89% | 2671 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,231 psi | 88% | 2697 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,027 psi | 85% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,013 psi | 86% | 2697 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,337 psi | 68% | 2602 fps | 96.9% |
| Accurate 4064 | <<locked>> | 90% | 56,275 psi | 88% | 2743 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,463 psi | 88% | 2828 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 56,289 psi | 88% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,276 psi | 90% | 2772 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,216 psi | 87% | 2726 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,260 psi | 88% | 2700 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,231 psi | 88% | 2890 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 57,537 psi | 90% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,476 psi | 85% | 2766 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,027 psi | 86% | 2864 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,176 psi | 65% | 2631 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,485 psi | 73% | 2792 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,275 psi | 88% | 2789 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 54,810 psi | 86% | 2762 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,650 psi | 86% | 2733 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,724 psi | 89% | 2707 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,795 psi | 86% | 2753 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,782 psi | 89% | 2851 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,535 psi | 87% | 2772 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 55,376 psi | 87% | 2822 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 94% | 55,796 psi | 87% | 2785 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 56,855 psi | 89% | 2785 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,563 psi | 84% | 2756 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,565 psi | 89% | 2815 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,246 psi | 88% | 2858 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,607 psi | 56% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,462 psi | 85% | 2736 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,087 psi | 89% | 2766 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,710 psi | 89% | 2756 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,652 psi | 89% | 2740 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 55,114 psi | 86% | 2756 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,594 psi | 89% | 2762 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,782 psi | 89% | 2815 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 55,883 psi | 88% | 2795 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,216 psi | 87% | 2726 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,333 psi | 88% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,651 psi | 87% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,652 psi | 89% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,985 psi | 88% | 2756 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 57,130 psi | 90% | 2792 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 55,042 psi | 86% | 2723 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,535 psi | 87% | 2720 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,363 psi | 90% | 2805 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,854 psi | 88% | 2805 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 46,238 psi | 72% | 2749 fps | 96.5% |
| Norma URP | <<locked>> | 98% | 55,216 psi | 87% | 2815 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 54,418 psi | 85% | 2779 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,070 psi | 85% | 2808 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 55,506 psi | 87% | 2746 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,143 psi | 86% | 2762 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,985 psi | 88% | 2726 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 57% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,883 psi | 88% | 2756 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,158 psi | 86% | 2831 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,723 psi | 86% | 2861 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,246 psi | 88% | 2848 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,492 psi | 87% | 2874 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 55,825 psi | 87% | 2703 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,448 psi | 87% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,679 psi | 86% | 2753 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,650 psi | 86% | 2733 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,985 psi | 88% | 2756 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,333 psi | 88% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,652 psi | 89% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,130 psi | 90% | 2792 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,318 psi | 88% | 2808 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,041 psi | 85% | 2723 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,781 psi | 86% | 2746 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,289 psi | 88% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,710 psi | 89% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,318 psi | 88% | 2710 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 56,391 psi | 88% | 2756 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,796 psi | 87% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,406 psi | 90% | 2762 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,940 psi | 86% | 2753 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,330 psi | 84% | 2815 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,516 psi | 78% | 2700 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 82% | 56,014 psi | 88% | 2625 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,565 psi | 89% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,405 psi | 87% | 2684 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,260 psi | 88% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,405 psi | 88% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,041 psi | 85% | 2759 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 55,666 psi | 87% | 2723 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,375 psi | 85% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,826 psi | 89% | 2815 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,455 psi | 71% | 2703 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,346 psi | 85% | 2736 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,883 psi | 88% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,550 psi | 87% | 2825 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,014 psi | 58% | 2644 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,708 psi | 86% | 2753 fps | 100% |
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% | 50,328 psi | 79% | 2585 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,207 psi | 68% | 2520 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,517 psi | 79% | 2664 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,165 psi | 71% | 2539 fps | 95.2% |
| Accurate 3100 | <<locked>> | 96% | 37,652 psi | 59% | 2493 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 40,843 psi | 64% | 2516 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,198 psi | 50% | 2395 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 46,514 psi | 73% | 2625 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,566 psi | 62% | 2484 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,573 psi | 76% | 2631 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,211 psi | 77% | 2612 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,569 psi | 67% | 2661 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,320 psi | 62% | 2503 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,177 psi | 66% | 2566 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,547 psi | 51% | 2408 fps | 95.1% |
| Alliant Reloder-17 | 76.7 gr | 80% | 34,084 psi | 53% | 2477 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,182 psi | 47% | 2372 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 92% | 34,925 psi | 55% | 2543 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,948 psi | 72% | 2631 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 39,102 psi | 61% | 2510 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 45,266 psi | 71% | 2579 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,212 psi | 79% | 2615 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,805 psi | 75% | 2651 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,837 psi | 83% | 2795 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 39,900 psi | 63% | 2510 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 42,351 psi | 66% | 2605 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 49,240 psi | 77% | 2684 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 46,934 psi | 74% | 2635 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,992 psi | 44% | 2264 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,178 psi | 68% | 2612 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 45,223 psi | 71% | 2677 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,063 psi | 71% | 2589 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 46,949 psi | 74% | 2628 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,568 psi | 65% | 2516 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,947 psi | 69% | 2533 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 45,585 psi | 71% | 2605 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,266 psi | 69% | 2562 fps | 95.8% |
| IMR 4831 | <<locked>> | 84% | 33,547 psi | 53% | 2411 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 43,207 psi | 68% | 2592 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 48,573 psi | 76% | 2631 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,919 psi | 72% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,253 psi | 72% | 2562 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 41,481 psi | 65% | 2516 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 38,725 psi | 61% | 2461 fps | 95.8% |
| Lovex S070 | <<locked>> | 88% | 41,785 psi | 65% | 2539 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,542 psi | 71% | 2579 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 45,905 psi | 72% | 2582 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,582 psi | 65% | 2552 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 48,733 psi | 76% | 2694 fps | 95% |
| Norma MRP | <<locked>> | 98% | 43,192 psi | 68% | 2687 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 32,576 psi | 51% | 2398 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 41,307 psi | 65% | 2566 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 38,885 psi | 61% | 2543 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 48,559 psi | 76% | 2638 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,240 psi | 76% | 2657 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,373 psi | 82% | 2677 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 42% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,277 psi | 63% | 2493 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,701 psi | 70% | 2667 fps | 99% |
| ReloadSwiss RS 60 | 76.7 gr | 80% | 36,245 psi | 57% | 2539 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,316 psi | 54% | 2464 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 36,738 psi | 58% | 2526 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 49,632 psi | 78% | 2615 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,395 psi | 68% | 2533 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,753 psi | 58% | 2454 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 45,266 psi | 71% | 2579 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 38,725 psi | 61% | 2461 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,919 psi | 72% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,481 psi | 65% | 2516 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 41,785 psi | 65% | 2539 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,768 psi | 59% | 2503 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,992 psi | 74% | 2615 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,063 psi | 71% | 2595 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,702 psi | 73% | 2530 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,986 psi | 61% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,410 psi | 68% | 2510 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 52,852 psi | 83% | 2707 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,398 psi | 73% | 2530 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,775 psi | 73% | 2608 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 37,536 psi | 59% | 2461 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 27,354 psi | 43% | 2300 fps | 96.4% |
| Somchem S385 | <<locked>> | 96% | 43,337 psi | 68% | 2595 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 52,591 psi | 82% | 2582 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,079 psi | 74% | 2520 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,931 psi | 67% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,468 psi | 68% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,723 psi | 56% | 2398 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 33,953 psi | 53% | 2402 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 48,776 psi | 76% | 2625 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,989 psi | 66% | 2513 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,591 psi | 53% | 2402 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 30,530 psi | 48% | 2395 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,691 psi | 50% | 2326 fps | 97% |
| Winchester 748 | <<locked>> | 80% | 48,660 psi | 76% | 2671 fps | 100% |
| Winchester 760 | 82.6 gr | 88% | 42,496 psi | 67% | 2608 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,456 psi | 45% | 2392 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,657 psi | 70% | 2598 fps | 99.6% |
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 98 powders for .375 Rem. Ultra Mag. loaded with the .374 | 250gr | Frontier BTSP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,890 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,890 fps. Accurate 3100 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 (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.374" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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. Alliant Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .375 Rem. Ultra Mag. with the .374 | 250gr | Frontier BTSP 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.