Load Specifications
Bullet Manufacturer:North Fork
Bullet Weight:250 gr
Bullet Diameter:0.375"
Bullet Length:<<locked>>
Caliber:.375 Rem. Ultra Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:117 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:6.0
Load data in caliber .375 Rem. Ultra Mag. with .375 | 250gr | NorthFork Bonded Core bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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>> | 82% | 55,709 psi | 87% | 2667 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,100 psi | 86% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,405 psi | 88% | 2753 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,377 psi | 90% | 2746 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,934 psi | 72% | 2654 fps | 97.7% |
| Accurate 4064 | <<locked>> | 88% | 55,317 psi | 87% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,492 psi | 87% | 2825 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 54,969 psi | 86% | 2769 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,072 psi | 88% | 2769 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,417 psi | 84% | 2802 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,290 psi | 90% | 2766 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,940 psi | 86% | 2694 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 54,868 psi | 86% | 2881 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,405 psi | 88% | 2789 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,884 psi | 89% | 2812 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,376 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,041 psi | 85% | 2858 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,431 psi | 82% | 2789 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,453 psi | 68% | 2684 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,159 psi | 60% | 2582 fps | 96.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,269 psi | 77% | 2851 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,911 psi | 86% | 2782 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 57,261 psi | 90% | 2805 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,058 psi | 89% | 2782 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,274 psi | 87% | 2700 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,130 psi | 90% | 2795 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,346 psi | 85% | 2769 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 54,520 psi | 85% | 2822 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 92% | 54,795 psi | 86% | 2785 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 84% | 55,564 psi | 87% | 2779 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2802 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,477 psi | 87% | 2808 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,969 psi | 86% | 2854 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,752 psi | 56% | 1722 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,681 psi | 89% | 2779 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,840 psi | 88% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,434 psi | 87% | 2753 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,216 psi | 87% | 2733 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 57,537 psi | 90% | 2805 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,390 psi | 87% | 2762 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 55,912 psi | 88% | 2815 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 54,795 psi | 86% | 2792 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,290 psi | 90% | 2766 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,998 psi | 86% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,624 psi | 90% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,492 psi | 87% | 2749 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,056 psi | 86% | 2756 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 56,057 psi | 88% | 2789 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 57,159 psi | 90% | 2762 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,360 psi | 85% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,130 psi | 88% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,723 psi | 86% | 2802 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 48,776 psi | 76% | 2805 fps | 97.4% |
| Norma URP | <<locked>> | 96% | 54,273 psi | 85% | 2812 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 57,000 psi | 89% | 2822 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,913 psi | 89% | 2861 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 57,711 psi | 90% | 2789 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,566 psi | 90% | 2805 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,274 psi | 57% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,592 psi | 86% | 2749 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,896 psi | 84% | 2825 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,522 psi | 90% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,303 psi | 87% | 2844 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,433 psi | 85% | 2871 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 54,636 psi | 86% | 2697 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,418 psi | 85% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,305 psi | 90% | 2799 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 2776 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2772 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 57,058 psi | 89% | 2782 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,056 psi | 86% | 2756 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,998 psi | 86% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,492 psi | 87% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,057 psi | 88% | 2789 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,274 psi | 87% | 2805 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,289 psi | 88% | 2769 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,029 psi | 89% | 2789 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,824 psi | 86% | 2654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,361 psi | 87% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,085 psi | 86% | 2707 fps | 98.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 2766 fps | 96.4% |
| Somchem S335 | <<locked>> | 84% | 54,389 psi | 85% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,956 psi | 88% | 2756 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,246 psi | 90% | 2795 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 2861 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,199 psi | 82% | 2756 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 84% | 55,201 psi | 87% | 2638 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,653 psi | 90% | 2720 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 54,868 psi | 86% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,274 psi | 87% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,753 psi | 89% | 2805 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 54,143 psi | 85% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,579 psi | 89% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,854 psi | 88% | 2812 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,298 psi | 76% | 2756 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,985 psi | 89% | 2782 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,433 psi | 85% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 54,723 psi | 86% | 2825 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,102 psi | 61% | 2710 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,188 psi | 90% | 2799 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% | 52,417 psi | 82% | 2625 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,223 psi | 71% | 2556 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,707 psi | 83% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,990 psi | 69% | 2533 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 37,333 psi | 59% | 2493 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 42,786 psi | 67% | 2556 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,807 psi | 50% | 2392 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 48,457 psi | 76% | 2667 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,089 psi | 64% | 2523 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 50,053 psi | 78% | 2746 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,502 psi | 79% | 2671 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,503 psi | 81% | 2651 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,585 psi | 70% | 2710 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,060 psi | 64% | 2546 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,092 psi | 69% | 2608 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,908 psi | 50% | 2405 fps | 95.2% |
| Alliant Reloder-17 | 80 gr | 80% | 35,694 psi | 56% | 2523 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,108 psi | 72% | 2680 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,905 psi | 44% | 2316 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,839 psi | 56% | 2526 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,330 psi | 54% | 2539 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,964 psi | 75% | 2674 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 41,002 psi | 64% | 2552 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 44,382 psi | 70% | 2575 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,953 psi | 81% | 2654 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,995 psi | 78% | 2697 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,640 psi | 65% | 2556 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 41,568 psi | 65% | 2602 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 45,136 psi | 71% | 2625 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 48,965 psi | 77% | 2680 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,341 psi | 46% | 2310 fps | 96.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,237 psi | 71% | 2654 fps | 99.9% |
| Hodgdon Superformance | 93 gr | 88% | 44,150 psi | 69% | 2671 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 42% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,804 psi | 73% | 2628 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,965 psi | 77% | 2667 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,149 psi | 68% | 2556 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,600 psi | 71% | 2579 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 44,715 psi | 70% | 2602 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,163 psi | 68% | 2556 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 33,054 psi | 52% | 2405 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 45,194 psi | 71% | 2638 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 50,502 psi | 79% | 2671 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,138 psi | 75% | 2644 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,964 psi | 75% | 2602 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,294 psi | 68% | 2559 fps | 99.8% |
| Lovex S065 | <<locked>> | 80% | 35,607 psi | 56% | 2405 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 40,944 psi | 64% | 2533 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 47,384 psi | 74% | 2618 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,776 psi | 75% | 2621 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,453 psi | 68% | 2598 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 47,761 psi | 75% | 2690 fps | 95.2% |
| Norma MRP | <<locked>> | 96% | 42,482 psi | 67% | 2687 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 31,981 psi | 50% | 2392 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 43,381 psi | 68% | 2612 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 38,159 psi | 60% | 2539 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 50,459 psi | 79% | 2680 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,285 psi | 79% | 2700 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 42% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,887 psi | 66% | 2539 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,007 psi | 74% | 2717 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,956 psi | 59% | 2589 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,779 psi | 53% | 2461 fps | 95.6% |
| ReloadSwiss RS 70 | 85.3 gr | 84% | 35,984 psi | 56% | 2520 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 51,474 psi | 81% | 2654 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,034 psi | 71% | 2572 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,537 psi | 60% | 2500 fps | 99% |
| Rottweil R 904 | <<locked>> | 98% | 51,764 psi | 81% | 2723 fps | 95% |
| Rottweil R 905 | <<locked>> | 98% | 47,979 psi | 75% | 2720 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 44,382 psi | 70% | 2575 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,607 psi | 56% | 2405 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,138 psi | 75% | 2644 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,294 psi | 68% | 2559 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,944 psi | 64% | 2533 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,653 psi | 62% | 2549 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,994 psi | 77% | 2657 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,978 psi | 74% | 2638 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,428 psi | 76% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,582 psi | 64% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,827 psi | 62% | 2454 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,500 psi | 74% | 2713 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 48,167 psi | 75% | 2566 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,820 psi | 77% | 2654 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,189 psi | 61% | 2503 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 28,776 psi | 45% | 2349 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 42,786 psi | 67% | 2595 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 48,863 psi | 77% | 2556 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,817 psi | 70% | 2549 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,281 psi | 71% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,304 psi | 58% | 2438 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,417 psi | 52% | 2395 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 50,749 psi | 80% | 2667 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,743 psi | 69% | 2549 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,909 psi | 52% | 2395 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 30,197 psi | 47% | 2392 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,098 psi | 52% | 2372 fps | 97.8% |
| Winchester 748 | <<locked>> | 80% | 50,836 psi | 80% | 2710 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,756 psi | 65% | 2605 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,094 psi | 44% | 2392 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,644 psi | 73% | 2641 fps | 99.9% |
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 100 powders for .375 Rem. Ultra Mag. loaded with the .375 | 250gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,907 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 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 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 250gr | NorthFork Bonded Core 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.