Load Specifications
Bullet Manufacturer:Lehigh Defense
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:1:16.0
Load data in caliber .375 Rem. Ultra Mag. with .375 | 270gr | Lehigh Defense Controlled Fracturing 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 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 2015 | <<locked>> | 84% | 57,508 psi | 90% | 2575 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,275 psi | 88% | 2598 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,491 psi | 85% | 2618 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,579 psi | 87% | 2612 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,700 psi | 68% | 2523 fps | 97.6% |
| Accurate 4064 | <<locked>> | 90% | 56,362 psi | 88% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,087 psi | 89% | 2740 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,797 psi | 89% | 2684 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,491 psi | 85% | 2638 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,706 psi | 81% | 2671 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,666 psi | 87% | 2635 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,971 psi | 89% | 2605 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,087 psi | 89% | 2802 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2667 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,534 psi | 85% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,114 psi | 86% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,505 psi | 85% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,825 psi | 87% | 2772 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2657 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,466 psi | 65% | 2549 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,876 psi | 73% | 2710 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,855 psi | 89% | 2697 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 55,100 psi | 86% | 2667 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,230 psi | 87% | 2648 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,319 psi | 90% | 2615 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,259 psi | 87% | 2661 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,537 psi | 90% | 2759 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,130 psi | 88% | 2687 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 56,086 psi | 88% | 2736 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 94% | 56,521 psi | 89% | 2703 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 86% | 57,435 psi | 90% | 2690 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,476 psi | 85% | 2671 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,406 psi | 90% | 2723 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,942 psi | 89% | 2776 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 56% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,027 psi | 86% | 2644 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,638 psi | 90% | 2667 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,421 psi | 90% | 2667 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,145 psi | 90% | 2651 fps | 98.9% |
| IMR 4350 | <<locked>> | 98% | 55,753 psi | 87% | 2674 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,116 psi | 90% | 2677 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2730 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,550 psi | 89% | 2707 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,666 psi | 87% | 2635 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,710 psi | 89% | 2654 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,072 psi | 88% | 2612 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,203 psi | 90% | 2657 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,463 psi | 88% | 2667 fps | 99.6% |
| Lovex S070 | <<locked>> | 98% | 57,595 psi | 90% | 2703 fps | 99.1% |
| Norma 201 | <<locked>> | 86% | 55,245 psi | 87% | 2628 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,999 psi | 88% | 2625 fps | 100% |
| Norma 203B | <<locked>> | 88% | 54,360 psi | 85% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,550 psi | 89% | 2723 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 46,601 psi | 73% | 2667 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 55,869 psi | 88% | 2726 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 55,114 psi | 86% | 2690 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,737 psi | 86% | 2723 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 56,072 psi | 88% | 2657 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,695 psi | 87% | 2671 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,391 psi | 88% | 2635 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,085 psi | 57% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,420 psi | 88% | 2671 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,811 psi | 87% | 2740 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,419 psi | 87% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,058 psi | 89% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,347 psi | 88% | 2792 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 56,043 psi | 88% | 2608 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,956 psi | 88% | 2628 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,969 psi | 86% | 2661 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 2641 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 55,230 psi | 87% | 2648 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,463 psi | 88% | 2667 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,710 psi | 89% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,203 psi | 90% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,595 psi | 90% | 2703 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,101 psi | 89% | 2720 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 57,101 psi | 89% | 2549 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,491 psi | 85% | 2635 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,288 psi | 87% | 2657 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,739 psi | 89% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,348 psi | 90% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,855 psi | 89% | 2625 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,849 psi | 77% | 2635 fps | 96.3% |
| Somchem S321 | <<locked>> | 82% | 57,000 psi | 89% | 2664 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,115 psi | 88% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,143 psi | 85% | 2625 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,419 psi | 87% | 2661 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 2726 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,980 psi | 78% | 2621 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 82% | 56,478 psi | 89% | 2530 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,101 psi | 89% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,840 psi | 88% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,652 psi | 89% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,898 psi | 89% | 2638 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,810 psi | 86% | 2674 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 56,144 psi | 88% | 2631 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,882 psi | 86% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,566 psi | 90% | 2726 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,934 psi | 72% | 2618 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,984 psi | 86% | 2648 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,449 psi | 88% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,275 psi | 88% | 2740 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,173 psi | 58% | 2569 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,347 psi | 87% | 2664 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% | 50,546 psi | 79% | 2493 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,033 psi | 67% | 2425 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,792 psi | 80% | 2572 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,380 psi | 66% | 2405 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 35,259 psi | 55% | 2365 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 40,712 psi | 64% | 2425 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,227 psi | 51% | 2316 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 46,760 psi | 73% | 2536 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,842 psi | 62% | 2402 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 48,327 psi | 76% | 2615 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,921 psi | 77% | 2539 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,748 psi | 78% | 2520 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,960 psi | 67% | 2579 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 45,034 psi | 71% | 2562 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,552 psi | 62% | 2421 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,366 psi | 66% | 2480 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,603 psi | 48% | 2283 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,142 psi | 54% | 2398 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,471 psi | 74% | 2605 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,282 psi | 44% | 2247 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,634 psi | 51% | 2411 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,412 psi | 73% | 2546 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 39,160 psi | 61% | 2421 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 42,801 psi | 67% | 2448 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,647 psi | 79% | 2526 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,153 psi | 75% | 2562 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,635 psi | 84% | 2707 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,016 psi | 63% | 2428 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 39,958 psi | 63% | 2474 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 43,555 psi | 68% | 2497 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 47,253 psi | 74% | 2546 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,949 psi | 44% | 2188 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,497 psi | 68% | 2523 fps | 99.9% |
| Hodgdon Superformance | 86.9 gr | 88% | 42,467 psi | 67% | 2543 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,368 psi | 71% | 2503 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 47,210 psi | 74% | 2533 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,858 psi | 66% | 2431 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,208 psi | 69% | 2451 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 43,163 psi | 68% | 2477 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,305 psi | 62% | 2385 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 31,444 psi | 49% | 2283 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 43,453 psi | 68% | 2507 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 48,921 psi | 77% | 2539 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,166 psi | 72% | 2513 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,615 psi | 73% | 2477 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 41,626 psi | 65% | 2431 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,332 psi | 57% | 2333 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 39,334 psi | 62% | 2408 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,687 psi | 72% | 2490 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,253 psi | 72% | 2493 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,727 psi | 65% | 2467 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 46,021 psi | 72% | 2559 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 40,553 psi | 64% | 2552 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 30,589 psi | 48% | 2270 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 41,684 psi | 65% | 2484 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 36,550 psi | 57% | 2411 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 48,936 psi | 77% | 2552 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,660 psi | 76% | 2569 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,750 psi | 83% | 2585 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,832 psi | 42% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,393 psi | 63% | 2411 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,223 psi | 71% | 2582 fps | 99.5% |
| ReloadSwiss RS 60 | 74.7 gr | 80% | 36,405 psi | 57% | 2457 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,126 psi | 50% | 2333 fps | 95.4% |
| ReloadSwiss RS 70 | 79.7 gr | 84% | 34,505 psi | 54% | 2395 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 49,588 psi | 78% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,453 psi | 68% | 2444 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,883 psi | 58% | 2372 fps | 99% |
| Rottweil R 905 | <<locked>> | 98% | 46,021 psi | 72% | 2585 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 42,801 psi | 67% | 2448 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,332 psi | 57% | 2333 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,166 psi | 72% | 2513 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,626 psi | 65% | 2431 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,334 psi | 62% | 2408 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,087 psi | 60% | 2421 fps | 98.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,543 psi | 75% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,239 psi | 74% | 2530 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,455 psi | 71% | 2510 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,079 psi | 74% | 2441 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,276 psi | 62% | 2320 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,872 psi | 64% | 2379 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,585 psi | 71% | 2579 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 53,272 psi | 83% | 2615 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,644 psi | 73% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,224 psi | 74% | 2526 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,608 psi | 59% | 2379 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 27,325 psi | 43% | 2224 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 40,814 psi | 64% | 2467 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 53,084 psi | 83% | 2487 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,543 psi | 75% | 2431 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,265 psi | 68% | 2425 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,830 psi | 69% | 2434 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,853 psi | 56% | 2320 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 31,865 psi | 50% | 2274 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 49,139 psi | 77% | 2536 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,221 psi | 66% | 2425 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,430 psi | 49% | 2274 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 88% | 30,414 psi | 48% | 2313 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,749 psi | 50% | 2254 fps | 97.7% |
| Winchester 748 | <<locked>> | 80% | 49,240 psi | 77% | 2582 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,147 psi | 63% | 2477 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,571 psi | 42% | 2260 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,005 psi | 71% | 2513 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 104 powders for .375 Rem. Ultra Mag. loaded with the .375 | 270gr | Lehigh Defense Controlled Fracturing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,802 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,802 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. The 270.0 gr projectile in 0.375" calls for a 1:16.0 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 60, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 270gr | Lehigh Defense Controlled Fracturing 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.