Load Specifications
Bullet Manufacturer:Fox Bullets
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:1:15.5
Load data in caliber .375 Rem. Ultra Mag. with .375 | 250gr | Fox Classic Hunter bullet and 101 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, Hodgdon Superformance and ReloadSwiss RS 60.
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>> | 84% | 54,592 psi | 86% | 2641 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,521 psi | 89% | 2710 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,695 psi | 89% | 2703 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,085 psi | 86% | 2723 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,376 psi | 88% | 2710 fps | 97.4% |
| Accurate 4064 | <<locked>> | 92% | 56,594 psi | 89% | 2746 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2835 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 88% | 57,406 psi | 90% | 2785 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,129 psi | 86% | 2736 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,391 psi | 88% | 2740 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,319 psi | 90% | 2710 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 57,566 psi | 90% | 2904 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,897 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,551 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,564 psi | 87% | 2779 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2838 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,275 psi | 88% | 2877 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,870 psi | 61% | 2582 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,598 psi | 68% | 2733 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 57,638 psi | 90% | 2802 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 55,608 psi | 87% | 2772 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,811 psi | 87% | 2743 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,679 psi | 86% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,840 psi | 88% | 2766 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,288 psi | 85% | 2812 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 57,130 psi | 90% | 2733 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 56,739 psi | 89% | 2785 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 98% | 56,405 psi | 88% | 2831 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 96% | 57,087 psi | 89% | 2799 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 54,404 psi | 85% | 2746 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,850 psi | 80% | 2717 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,969 psi | 85% | 2779 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 57,696 psi | 90% | 2874 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 55% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,941 psi | 88% | 2753 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,317 psi | 85% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,433 psi | 85% | 2720 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,578 psi | 86% | 2703 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 57,580 psi | 90% | 2648 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2766 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 96% | 57,740 psi | 90% | 2772 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,795 psi | 84% | 2772 fps | 99.7% |
| IMR 4895 | <<locked>> | 90% | 57,014 psi | 89% | 2808 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 56,391 psi | 88% | 2740 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,550 psi | 89% | 2723 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,261 psi | 90% | 2759 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,956 psi | 89% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,128 psi | 85% | 2717 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,855 psi | 89% | 2762 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 54,462 psi | 85% | 2749 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 55,898 psi | 88% | 2730 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,594 psi | 89% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,752 psi | 86% | 2766 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 2815 fps | 96.7% |
| Norma URPᴾ | <<locked>> | 100% | 56,202 psi | 88% | 2825 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 55,477 psi | 87% | 2789 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,926 psi | 86% | 2818 fps | 98.8% |
| Ramshot TAC | <<locked>> | 86% | 56,855 psi | 89% | 2756 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,550 psi | 89% | 2776 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,435 psi | 90% | 2740 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 56% | 1732 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,840 psi | 88% | 2720 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,087 psi | 89% | 2769 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,246 psi | 88% | 2844 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,912 psi | 88% | 2874 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2854 fps | 99.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 2887 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 86% | 56,637 psi | 89% | 2713 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,391 psi | 88% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,448 psi | 87% | 2762 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,811 psi | 87% | 2743 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,855 psi | 89% | 2762 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,261 psi | 90% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,128 psi | 85% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,462 psi | 85% | 2749 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 57,493 psi | 90% | 2822 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,201 psi | 87% | 2736 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,985 psi | 88% | 2759 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,551 psi | 90% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,462 psi | 85% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,522 psi | 90% | 2720 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 53,998 psi | 85% | 2720 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,884 psi | 89% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,940 psi | 86% | 2726 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,622 psi | 87% | 2759 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2772 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,319 psi | 90% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,578 psi | 86% | 2618 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,188 psi | 88% | 2694 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,232 psi | 90% | 2710 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,348 psi | 90% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,984 psi | 86% | 2766 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 57,116 psi | 90% | 2740 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,376 psi | 87% | 2707 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,969 psi | 85% | 2772 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,554 psi | 67% | 2654 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,608 psi | 87% | 2746 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,087 psi | 89% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,594 psi | 89% | 2835 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,635 psi | 54% | 2575 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,941 psi | 88% | 2766 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% | 48,153 psi | 75% | 2556 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,707 psi | 83% | 2661 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,335 psi | 63% | 2474 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,819 psi | 75% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,093 psi | 72% | 2552 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,145 psi | 60% | 2467 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,563 psi | 54% | 2451 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 44,483 psi | 70% | 2589 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,768 psi | 59% | 2441 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,586 psi | 73% | 2595 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 46,775 psi | 73% | 2579 fps | 100% |
| Alliant Power Pro 2000-MR | 76.1 gr | 80% | 40,422 psi | 63% | 2612 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,231 psi | 58% | 2461 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,041 psi | 85% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,118 psi | 63% | 2523 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,851 psi | 51% | 2415 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,184 psi | 50% | 2428 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,095 psi | 47% | 2369 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,099 psi | 55% | 2546 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,758 psi | 69% | 2589 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 36,709 psi | 58% | 2461 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 46,035 psi | 72% | 2589 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,298 psi | 76% | 2585 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,353 psi | 71% | 2612 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,386 psi | 79% | 2753 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 53,417 psi | 84% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,695 psi | 59% | 2464 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 90% | 42,960 psi | 67% | 2615 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 90% | 46,963 psi | 74% | 2638 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 44,875 psi | 70% | 2598 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,994 psi | 47% | 2316 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,988 psi | 64% | 2569 fps | 99.4% |
| Hodgdon Superformance | 91.1 gr | 92% | 46,122 psi | 72% | 2690 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 41% | 1512 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,033 psi | 67% | 2549 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 44,570 psi | 70% | 2592 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,624 psi | 62% | 2474 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,177 psi | 66% | 2493 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 54,288 psi | 85% | 2608 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 46,369 psi | 73% | 2615 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,092 psi | 71% | 2575 fps | 95.8% |
| IMR 4831 | <<locked>> | 86% | 33,547 psi | 53% | 2411 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,118 psi | 64% | 2552 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,586 psi | 73% | 2595 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 52,779 psi | 83% | 2674 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,395 psi | 68% | 2562 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,411 psi | 70% | 2526 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 39,363 psi | 62% | 2477 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,102 psi | 61% | 2470 fps | 95.7% |
| Lovex S070 | <<locked>> | 90% | 42,090 psi | 66% | 2543 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,279 psi | 68% | 2539 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 43,772 psi | 69% | 2549 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,465 psi | 62% | 2510 fps | 98.4% |
| Norma 204 | <<locked>> | 96% | 49,821 psi | 78% | 2707 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 35,085 psi | 55% | 2457 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 39,073 psi | 61% | 2523 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 39,233 psi | 61% | 2549 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 46,615 psi | 73% | 2598 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,122 psi | 72% | 2618 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,343 psi | 79% | 2641 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,397 psi | 41% | 1549 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,315 psi | 82% | 2674 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,901 psi | 64% | 2503 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,337 psi | 66% | 2621 fps | 98.5% |
| ReloadSwiss RS 60 | 75 gr | 80% | 34,345 psi | 54% | 2493 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,519 psi | 54% | 2470 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,246 psi | 58% | 2533 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 47,108 psi | 74% | 2579 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,147 psi | 64% | 2493 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 34,534 psi | 54% | 2408 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 46,035 psi | 72% | 2589 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,102 psi | 61% | 2470 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,395 psi | 68% | 2562 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,363 psi | 62% | 2477 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,090 psi | 66% | 2543 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,723 psi | 56% | 2457 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,773 psi | 70% | 2572 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,975 psi | 67% | 2556 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,817 psi | 70% | 2497 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,260 psi | 58% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,106 psi | 69% | 2516 fps | 95.7% |
| Somchem S321 | <<locked>> | 80% | 50,444 psi | 79% | 2671 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,338 psi | 69% | 2497 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,556 psi | 70% | 2569 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,418 psi | 56% | 2415 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 25,556 psi | 40% | 2244 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 50,647 psi | 79% | 2552 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,208 psi | 71% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,741 psi | 64% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,466 psi | 65% | 2487 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,750 psi | 53% | 2356 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,258 psi | 54% | 2405 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 46,557 psi | 73% | 2589 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 39,885 psi | 63% | 2474 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,779 psi | 53% | 2408 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 32,372 psi | 51% | 2441 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,965 psi | 47% | 2280 fps | 96% |
| Winchester 748 | <<locked>> | 80% | 46,412 psi | 73% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,134 psi | 68% | 2618 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,369 psi | 44% | 2385 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,395 psi | 66% | 2559 fps | 99.3% |
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 101 powders for .375 Rem. Ultra Mag. loaded with the .375 | 250gr | Fox Classic Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,904 fps. Accurate 4350 gives the best case fill at 100 %, and 101 of the 101 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 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, 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 Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 250gr | Fox Classic Hunter 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.