Load Specifications
Bullet:.375 | 270gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:270 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 | 270gr | Swift A-Frame bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
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 2495 | <<locked>> | 84% | 54,563 psi | 86% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,304 psi | 88% | 2644 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2621 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 54,766 psi | 86% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,216 psi | 87% | 2726 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,624 psi | 90% | 2710 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,376 psi | 87% | 2667 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,550 psi | 89% | 2762 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,304 psi | 88% | 2657 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,201 psi | 85% | 2776 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,376 psi | 88% | 2759 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,941 psi | 88% | 2687 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,173 psi | 88% | 2707 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,956 psi | 88% | 2776 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,537 psi | 90% | 2805 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 2749 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 2694 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,180 psi | 72% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,553 psi | 64% | 2562 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,866 psi | 83% | 2815 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,925 psi | 85% | 2674 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,681 psi | 89% | 2700 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,066 psi | 77% | 2694 fps | 97% |
| Bofors RP7 | <<locked>> | 92% | 56,275 psi | 88% | 2684 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,624 psi | 90% | 2635 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,289 psi | 88% | 2687 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,261 psi | 90% | 2717 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 57,595 psi | 90% | 2772 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 90% | 54,041 psi | 85% | 2684 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 82% | 54,737 psi | 86% | 2671 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,289 psi | 88% | 2703 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,795 psi | 86% | 2703 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,143 psi | 85% | 2756 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 57% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,869 psi | 88% | 2671 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,216 psi | 87% | 2648 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,737 psi | 86% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,682 psi | 90% | 2680 fps | 99.2% |
| IMR 4350 | <<locked>> | 96% | 56,942 psi | 89% | 2710 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,563 psi | 86% | 2661 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 55,637 psi | 87% | 2717 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,624 psi | 90% | 2733 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,072 psi | 88% | 2694 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 82% | 56,304 psi | 88% | 2657 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,404 psi | 85% | 2635 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,652 psi | 89% | 2638 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,897 psi | 86% | 2644 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,375 psi | 85% | 2657 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,492 psi | 87% | 2690 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,930 psi | 64% | 2484 fps | 97.4% |
| Norma 201 | <<locked>> | 84% | 56,376 psi | 88% | 2654 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,985 psi | 89% | 2651 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,434 psi | 87% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,085 psi | 85% | 2707 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2772 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 57,580 psi | 90% | 2759 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,159 psi | 88% | 2717 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,492 psi | 89% | 2762 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 56,536 psi | 89% | 2680 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,666 psi | 89% | 2697 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,680 psi | 57% | 1703 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,377 psi | 90% | 2700 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,130 psi | 90% | 2772 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,029 psi | 89% | 2802 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,085 psi | 86% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,809 psi | 84% | 2772 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 57,101 psi | 89% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,971 psi | 89% | 2654 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,753 psi | 89% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,723 psi | 86% | 2684 fps | 96.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2736 fps | 98% |
| Rottweil R 907 | <<locked>> | 92% | 56,275 psi | 88% | 2684 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,375 psi | 85% | 2657 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,404 psi | 85% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,897 psi | 86% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,492 psi | 87% | 2690 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,679 psi | 86% | 2703 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,332 psi | 87% | 2664 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,057 psi | 88% | 2680 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,363 psi | 90% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,694 psi | 86% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,259 psi | 85% | 2612 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 2730 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 56,956 psi | 89% | 2589 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,926 psi | 86% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,782 psi | 89% | 2694 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 56,739 psi | 89% | 2677 fps | 96.1% |
| Somchem S365 | <<locked>> | 98% | 56,507 psi | 89% | 2759 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2713 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 82% | 54,389 psi | 85% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,174 psi | 90% | 2615 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,566 psi | 90% | 2628 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,621 psi | 86% | 2621 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,289 psi | 88% | 2707 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,761 psi | 75% | 2585 fps | 97% |
| Vihtavuori N530 | <<locked>> | 82% | 56,898 psi | 89% | 2657 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,782 psi | 87% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,477 psi | 87% | 2717 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2717 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,202 psi | 88% | 2677 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,522 psi | 90% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,215 psi | 85% | 2726 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,684 psi | 65% | 2684 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,318 psi | 88% | 2687 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2654 fps | 97.2% |
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 2495 | <<locked>> | 80% | 47,964 psi | 75% | 2500 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,166 psi | 72% | 2490 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 34,940 psi | 55% | 2365 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,368 psi | 71% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,011 psi | 53% | 2362 fps | 97% |
| ADI AR 2206H | <<locked>> | 80% | 50,792 psi | 80% | 2612 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,207 psi | 68% | 2477 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 43,482 psi | 68% | 2549 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,866 psi | 83% | 2612 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,123 psi | 74% | 2664 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 43,482 psi | 68% | 2549 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,395 psi | 68% | 2500 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,383 psi | 73% | 2559 fps | 99.7% |
| Alliant Reloder-16 | 73.9 gr | 80% | 33,620 psi | 53% | 2372 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,826 psi | 59% | 2490 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,960 psi | 67% | 2543 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 42,989 psi | 67% | 2585 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,136 psi | 41% | 2192 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,562 psi | 53% | 2398 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,865 psi | 50% | 2402 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,473 psi | 79% | 2625 fps | 99.9% |
| Bofors RP3 | <<locked>> | 80% | 43,569 psi | 68% | 2510 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 42,989 psi | 67% | 2585 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 41,162 psi | 65% | 2434 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,317 psi | 85% | 2592 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,663 psi | 83% | 2638 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,034 psi | 69% | 2513 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 38,711 psi | 61% | 2457 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 41,858 psi | 66% | 2480 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 51,314 psi | 80% | 2621 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,212 psi | 49% | 2280 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,805 psi | 75% | 2602 fps | 100% |
| Hodgdon Superformance | 88.4 gr | 84% | 40,611 psi | 64% | 2523 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 42% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,182 psi | 77% | 2575 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,808 psi | 81% | 2605 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,426 psi | 71% | 2507 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,819 psi | 75% | 2530 fps | 97.8% |
| IMR 4350 | <<locked>> | 84% | 39,073 psi | 61% | 2411 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,987 psi | 63% | 2411 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 32,880 psi | 52% | 2320 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 47,558 psi | 75% | 2589 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,692 psi | 83% | 2644 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 52,866 psi | 83% | 2612 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,763 psi | 80% | 2589 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,183 psi | 79% | 2546 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,614 psi | 71% | 2510 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,565 psi | 59% | 2369 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 38,159 psi | 60% | 2398 fps | 95.6% |
| Lovex S071 | <<locked>> | 96% | 35,940 psi | 56% | 2385 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 49,806 psi | 78% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,328 psi | 79% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,759 psi | 72% | 2549 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,092 psi | 69% | 2543 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 39,494 psi | 62% | 2546 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 34,113 psi | 53% | 2359 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 45,876 psi | 72% | 2566 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,491 psi | 56% | 2398 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,982 psi | 83% | 2631 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,895 psi | 83% | 2644 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 43% | 1522 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,208 psi | 69% | 2497 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,792 psi | 78% | 2664 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,234 psi | 63% | 2546 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,794 psi | 53% | 2375 fps | 96.5% |
| ReloadSwiss RS 70 | 80.9 gr | 80% | 33,243 psi | 52% | 2379 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 53,795 psi | 84% | 2589 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,369 psi | 74% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,915 psi | 64% | 2457 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 48,196 psi | 76% | 2582 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 41,916 psi | 66% | 2526 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 41,162 psi | 65% | 2434 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,565 psi | 59% | 2369 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,763 psi | 80% | 2589 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,614 psi | 71% | 2510 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,159 psi | 60% | 2398 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,945 psi | 66% | 2503 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,750 psi | 81% | 2612 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,342 psi | 77% | 2585 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,705 psi | 79% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,627 psi | 67% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,247 psi | 62% | 2365 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,251 psi | 69% | 2572 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 50,459 psi | 79% | 2503 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,387 psi | 81% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,466 psi | 65% | 2457 fps | 99.7% |
| Somchem S361 | <<locked>> | 96% | 53,127 psi | 83% | 2625 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 30,632 psi | 48% | 2320 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 39,827 psi | 62% | 2457 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,169 psi | 80% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,369 psi | 74% | 2490 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,674 psi | 75% | 2500 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,479 psi | 62% | 2395 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,447 psi | 56% | 2359 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 41,829 psi | 66% | 2484 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 53,345 psi | 84% | 2608 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,064 psi | 72% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,056 psi | 55% | 2362 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 28,369 psi | 44% | 2264 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,896 psi | 55% | 2336 fps | 99% |
| Winchester 748 | <<locked>> | 80% | 53,766 psi | 84% | 2654 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,711 psi | 61% | 2457 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,266 psi | 41% | 2267 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,255 psi | 77% | 2592 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,223 psi | 71% | 2546 fps | 95.6% |
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 105 powders for .375 Rem. Ultra Mag. loaded with the .375 | 270gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,815 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 270.0 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 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 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 270gr | 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.