Load Specifications
Bullet:.375 | 250gr | Swift A-Frame
Bullet Manufacturer:Swift
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
Load data in caliber .375 Rem. Ultra Mag. with .375 | 250gr | Swift A-Frame bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Hodgdon H414.
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% | 57,058 psi | 89% | 2690 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,594 psi | 89% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,882 psi | 86% | 2720 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2690 fps | 98.3% |
| Accurate 4064 | <<locked>> | 88% | 56,695 psi | 89% | 2762 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,319 psi | 90% | 2858 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,304 psi | 88% | 2795 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,421 psi | 90% | 2795 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2835 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,940 psi | 86% | 2743 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,434 psi | 88% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,666 psi | 89% | 2917 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,940 psi | 86% | 2835 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,433 psi | 85% | 2769 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,882 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,447 psi | 85% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,709 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,128 psi | 85% | 2825 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,802 psi | 70% | 2713 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,363 psi | 62% | 2618 fps | 96.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2887 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,420 psi | 88% | 2808 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,288 psi | 87% | 2785 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 54,955 psi | 86% | 2762 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,362 psi | 88% | 2723 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,897 psi | 86% | 2772 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,883 psi | 88% | 2799 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 56,144 psi | 88% | 2854 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 92% | 56,202 psi | 88% | 2815 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 84% | 56,898 psi | 89% | 2805 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 54,650 psi | 86% | 2785 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,956 psi | 89% | 2838 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,710 psi | 89% | 2890 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 56% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,433 psi | 85% | 2756 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,246 psi | 90% | 2782 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,927 psi | 89% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,449 psi | 88% | 2762 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 55,477 psi | 87% | 2785 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,753 psi | 89% | 2792 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 54,041 psi | 85% | 2795 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 56,260 psi | 88% | 2818 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 54,940 psi | 86% | 2743 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,565 psi | 89% | 2769 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,419 psi | 87% | 2723 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,985 psi | 89% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,449 psi | 88% | 2785 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 57,566 psi | 90% | 2818 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,436 psi | 62% | 2543 fps | 96.3% |
| Norma 201 | <<locked>> | 84% | 54,955 psi | 86% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,695 psi | 87% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,566 psi | 90% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,391 psi | 88% | 2835 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2844 fps | 98% |
| Norma URP | <<locked>> | 96% | 55,970 psi | 88% | 2841 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 54,868 psi | 86% | 2799 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,882 psi | 86% | 2838 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 55,216 psi | 87% | 2762 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,085 psi | 86% | 2779 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,985 psi | 88% | 2782 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,535 psi | 87% | 2854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,390 psi | 87% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,188 psi | 90% | 2877 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,217 psi | 88% | 2907 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 55,782 psi | 87% | 2720 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,521 psi | 87% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,129 psi | 86% | 2776 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 2808 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,026 psi | 83% | 2808 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 54,955 psi | 86% | 2762 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,449 psi | 88% | 2785 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,565 psi | 89% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,985 psi | 89% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,566 psi | 90% | 2818 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,797 psi | 89% | 2835 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,420 psi | 88% | 2661 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,954 psi | 85% | 2743 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,810 psi | 86% | 2766 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,028 psi | 88% | 2677 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,797 psi | 89% | 2677 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,550 psi | 89% | 2740 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 2802 fps | 97% |
| Somchem S335 | <<locked>> | 84% | 55,637 psi | 87% | 2674 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,464 psi | 90% | 2785 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,347 psi | 87% | 2776 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,752 psi | 86% | 2844 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,838 psi | 84% | 2785 fps | 98% |
| Vihtavuori N133 | <<locked>> | 84% | 56,420 psi | 88% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,695 psi | 87% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,159 psi | 88% | 2717 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,797 psi | 89% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,810 psi | 86% | 2789 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,412 psi | 73% | 2651 fps | 96% |
| Vihtavuori N530 | <<locked>> | 82% | 55,463 psi | 87% | 2743 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,462 psi | 85% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,609 psi | 90% | 2844 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,995 psi | 78% | 2789 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,766 psi | 86% | 2759 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,941 psi | 88% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,304 psi | 88% | 2854 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,480 psi | 63% | 2746 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,882 psi | 86% | 2772 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2723 fps | 96.2% |
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% | 53,563 psi | 84% | 2644 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,601 psi | 73% | 2582 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,063 psi | 71% | 2562 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 36,085 psi | 57% | 2474 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 44,092 psi | 69% | 2582 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,895 psi | 52% | 2421 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 49,603 psi | 78% | 2697 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,148 psi | 66% | 2549 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,211 psi | 76% | 2723 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,706 psi | 81% | 2697 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,837 psi | 83% | 2671 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,788 psi | 72% | 2740 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,095 psi | 75% | 2723 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,206 psi | 66% | 2572 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,223 psi | 71% | 2638 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,677 psi | 51% | 2431 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,724 psi | 58% | 2556 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,442 psi | 74% | 2713 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,718 psi | 45% | 2346 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,014 psi | 58% | 2566 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,185 psi | 52% | 2516 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,139 psi | 77% | 2700 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,177 psi | 66% | 2579 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,714 psi | 67% | 2552 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,098 psi | 83% | 2677 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,256 psi | 80% | 2720 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,815 psi | 67% | 2585 fps | 98.1% |
| Hodgdon H414 | 84.3 gr | 84% | 40,059 psi | 63% | 2575 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 46,398 psi | 73% | 2654 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,125 psi | 79% | 2703 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,153 psi | 47% | 2336 fps | 96.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,528 psi | 73% | 2684 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,380 psi | 66% | 2644 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 42% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,921 psi | 75% | 2657 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,401 psi | 79% | 2694 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,251 psi | 69% | 2585 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,760 psi | 73% | 2605 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 43,250 psi | 68% | 2582 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,582 psi | 65% | 2533 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 31,879 psi | 50% | 2382 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 46,354 psi | 73% | 2664 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,706 psi | 81% | 2697 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,472 psi | 78% | 2671 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,066 psi | 77% | 2628 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,425 psi | 70% | 2585 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,550 psi | 57% | 2434 fps | 95.5% |
| Lovex S070 | <<locked>> | 84% | 39,479 psi | 62% | 2513 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 37,028 psi | 58% | 2493 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 48,559 psi | 76% | 2644 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,008 psi | 77% | 2644 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,570 psi | 70% | 2625 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 49,197 psi | 77% | 2723 fps | 95.8% |
| Norma MRP | <<locked>> | 94% | 41,017 psi | 64% | 2664 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 32,982 psi | 52% | 2421 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 44,541 psi | 70% | 2641 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,782 psi | 58% | 2513 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 51,706 psi | 81% | 2710 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,663 psi | 81% | 2726 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 43% | 1591 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,989 psi | 67% | 2566 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,240 psi | 76% | 2743 fps | 99.7% |
| ReloadSwiss RS 60 | 82.1 gr | 80% | 39,044 psi | 61% | 2615 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,576 psi | 51% | 2434 fps | 95.2% |
| ReloadSwiss RS 70 | 85.5 gr | 82% | 34,621 psi | 54% | 2493 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 52,605 psi | 82% | 2677 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,253 psi | 72% | 2598 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,682 psi | 62% | 2526 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 53,359 psi | 84% | 2756 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 96% | 46,354 psi | 73% | 2697 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 84% | 42,714 psi | 67% | 2552 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,550 psi | 57% | 2434 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,472 psi | 78% | 2671 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,425 psi | 70% | 2585 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,479 psi | 62% | 2513 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,712 psi | 64% | 2575 fps | 99% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,951 psi | 78% | 2575 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,386 psi | 79% | 2690 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,022 psi | 75% | 2664 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,487 psi | 78% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,553 psi | 65% | 2461 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,814 psi | 64% | 2480 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,905 psi | 72% | 2694 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 49,327 psi | 77% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,980 psi | 78% | 2680 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,306 psi | 63% | 2533 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,675 psi | 47% | 2379 fps | 97.9% |
| Somchem S385 | <<locked>> | 92% | 41,321 psi | 65% | 2575 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 49,951 psi | 78% | 2575 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,992 psi | 72% | 2572 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,441 psi | 73% | 2582 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,348 psi | 60% | 2464 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,389 psi | 54% | 2425 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 98% | 43,410 psi | 68% | 2598 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 51,909 psi | 81% | 2694 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,918 psi | 70% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,968 psi | 53% | 2425 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 31,299 psi | 49% | 2421 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,939 psi | 53% | 2398 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 52,373 psi | 82% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,190 psi | 63% | 2579 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,151 psi | 43% | 2365 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,834 psi | 75% | 2667 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,094 psi | 74% | 2667 fps | 95.4% |
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 104 powders for .375 Rem. Ultra Mag. loaded with the .375 | 250gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,736 fps to 2,917 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 60, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 250gr | Swift A-Frame 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.