Load Specifications
Bullet:.375 | 270gr | Barnes LRX BT
Bullet Manufacturer:Barnes
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:1:15.5
Load data in caliber .375 Rem. Ultra Mag. with .375 | 270gr | Barnes LRX BT bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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% | 57,029 psi | 89% | 2569 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,796 psi | 87% | 2592 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,085 psi | 85% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,216 psi | 87% | 2605 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,221 psi | 68% | 2513 fps | 97.5% |
| Accurate 4064 | <<locked>> | 90% | 55,898 psi | 88% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 56,681 psi | 89% | 2733 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,405 psi | 88% | 2677 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 57,725 psi | 90% | 2677 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2661 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,448 psi | 87% | 2628 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,449 psi | 88% | 2598 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,695 psi | 89% | 2795 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,952 psi | 80% | 2657 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,317 psi | 85% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,737 psi | 86% | 2671 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 57,667 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 55,477 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,169 psi | 79% | 2648 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,191 psi | 65% | 2543 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 46,572 psi | 73% | 2703 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,492 psi | 89% | 2694 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,708 psi | 86% | 2661 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,897 psi | 86% | 2641 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,898 psi | 89% | 2608 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,853 psi | 86% | 2654 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,101 psi | 89% | 2753 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,738 psi | 87% | 2677 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 55,753 psi | 87% | 2733 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 94% | 56,188 psi | 88% | 2694 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 56,985 psi | 89% | 2684 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2661 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,014 psi | 89% | 2717 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 56,478 psi | 89% | 2769 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 56% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,853 psi | 86% | 2641 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,392 psi | 90% | 2664 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,014 psi | 89% | 2661 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,000 psi | 89% | 2648 fps | 98.8% |
| IMR 4350 | <<locked>> | 98% | 55,448 psi | 87% | 2667 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,797 psi | 89% | 2671 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,203 psi | 90% | 2723 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 56,173 psi | 88% | 2697 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,448 psi | 87% | 2628 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,463 psi | 88% | 2651 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,898 psi | 88% | 2608 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,797 psi | 89% | 2654 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,115 psi | 88% | 2661 fps | 99.5% |
| Lovex S070 | <<locked>> | 98% | 57,246 psi | 90% | 2697 fps | 99.1% |
| Norma 201 | <<locked>> | 86% | 55,013 psi | 86% | 2621 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,753 psi | 87% | 2621 fps | 100% |
| Norma 203B | <<locked>> | 90% | 57,566 psi | 90% | 2707 fps | 100% |
| Norma 204 | <<locked>> | 98% | 56,260 psi | 88% | 2717 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2664 fps | 97.2% |
| Norma URP | <<locked>> | 98% | 55,506 psi | 87% | 2717 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 54,737 psi | 86% | 2680 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 54,404 psi | 85% | 2720 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 55,709 psi | 87% | 2651 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,506 psi | 87% | 2664 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,202 psi | 88% | 2631 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 56% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,072 psi | 88% | 2664 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,390 psi | 87% | 2733 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,056 psi | 86% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 56,449 psi | 88% | 2753 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,840 psi | 88% | 2782 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 55,593 psi | 87% | 2598 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,521 psi | 87% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,781 psi | 86% | 2657 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 2631 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 54,897 psi | 86% | 2641 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,115 psi | 88% | 2661 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,463 psi | 88% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,797 psi | 89% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,246 psi | 90% | 2697 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 56,739 psi | 89% | 2713 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 54,143 psi | 85% | 2628 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,897 psi | 86% | 2648 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,536 psi | 89% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,956 psi | 89% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,594 psi | 89% | 2621 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 48,559 psi | 76% | 2628 fps | 96.2% |
| Somchem S321 | <<locked>> | 82% | 56,608 psi | 89% | 2657 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,898 psi | 88% | 2559 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 57,595 psi | 90% | 2667 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,013 psi | 86% | 2654 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2717 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 49,676 psi | 78% | 2615 fps | 97.3% |
| Vihtavuori N130 | <<locked>> | 82% | 56,043 psi | 88% | 2523 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,855 psi | 89% | 2546 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,564 psi | 87% | 2585 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,463 psi | 88% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 56,536 psi | 89% | 2631 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 54,447 psi | 85% | 2667 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,912 psi | 88% | 2628 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,491 psi | 85% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,000 psi | 89% | 2720 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 45,600 psi | 71% | 2615 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 54,752 psi | 86% | 2644 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,043 psi | 88% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,941 psi | 88% | 2733 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,811 psi | 58% | 2559 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,955 psi | 86% | 2657 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% | 50,270 psi | 79% | 2487 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,728 psi | 67% | 2421 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,546 psi | 79% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,235 psi | 66% | 2402 fps | 95.1% |
| Accurate 3100 | <<locked>> | 94% | 34,954 psi | 55% | 2359 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 40,480 psi | 63% | 2418 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,995 psi | 50% | 2310 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 46,543 psi | 73% | 2530 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,494 psi | 62% | 2392 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 98% | 48,051 psi | 75% | 2608 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,689 psi | 76% | 2536 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,458 psi | 78% | 2513 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,598 psi | 67% | 2569 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 47,863 psi | 75% | 2608 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,334 psi | 62% | 2415 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,148 psi | 66% | 2474 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,443 psi | 48% | 2277 fps | 95% |
| Alliant Reloder-17 | 74.3 gr | 80% | 33,997 psi | 53% | 2395 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 47,137 psi | 74% | 2598 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,050 psi | 44% | 2238 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,401 psi | 51% | 2402 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,021 psi | 72% | 2539 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 38,957 psi | 61% | 2418 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 42,467 psi | 67% | 2441 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,241 psi | 79% | 2520 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,732 psi | 75% | 2556 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,214 psi | 83% | 2697 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,827 psi | 62% | 2425 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 39,653 psi | 62% | 2467 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 88% | 46,354 psi | 73% | 2543 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 46,992 psi | 74% | 2539 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,775 psi | 44% | 2182 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,279 psi | 68% | 2520 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,177 psi | 66% | 2536 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,165 psi | 71% | 2497 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 46,934 psi | 74% | 2530 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,495 psi | 65% | 2425 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,005 psi | 69% | 2448 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 42,873 psi | 67% | 2470 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,611 psi | 65% | 2428 fps | 95.7% |
| IMR 4831 | <<locked>> | 82% | 31,125 psi | 49% | 2274 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 43,192 psi | 68% | 2503 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 48,689 psi | 76% | 2536 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,919 psi | 72% | 2510 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,398 psi | 73% | 2470 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 41,408 psi | 65% | 2425 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 36,158 psi | 57% | 2326 fps | 95.6% |
| Lovex S070 | <<locked>> | 86% | 39,015 psi | 61% | 2402 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 45,455 psi | 71% | 2484 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,021 psi | 72% | 2490 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,524 psi | 65% | 2461 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 45,730 psi | 72% | 2552 fps | 95% |
| Norma MRP | <<locked>> | 96% | 40,321 psi | 63% | 2546 fps | 95.4% |
| Norma URP | <<locked>> | 82% | 32,474 psi | 51% | 2316 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 41,321 psi | 65% | 2477 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 36,289 psi | 57% | 2405 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 48,776 psi | 76% | 2549 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,443 psi | 76% | 2566 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,576 psi | 82% | 2582 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,716 psi | 42% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,248 psi | 63% | 2408 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,802 psi | 70% | 2572 fps | 99.4% |
| ReloadSwiss RS 60 | 74.3 gr | 80% | 36,230 psi | 57% | 2454 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,937 psi | 50% | 2326 fps | 95.3% |
| ReloadSwiss RS 70 | 79.2 gr | 84% | 34,229 psi | 54% | 2385 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 49,327 psi | 77% | 2516 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,236 psi | 68% | 2441 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 36,637 psi | 57% | 2365 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 45,716 psi | 72% | 2579 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 86% | 42,467 psi | 67% | 2441 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,158 psi | 57% | 2326 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,919 psi | 72% | 2510 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,408 psi | 65% | 2425 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 39,015 psi | 61% | 2402 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,739 psi | 59% | 2415 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,065 psi | 74% | 2523 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,063 psi | 71% | 2503 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,847 psi | 73% | 2434 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,059 psi | 61% | 2313 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,553 psi | 64% | 2372 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 45,281 psi | 71% | 2575 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 52,881 psi | 83% | 2608 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,427 psi | 73% | 2434 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,833 psi | 73% | 2516 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,405 psi | 59% | 2372 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 27,050 psi | 42% | 2218 fps | 97.1% |
| Somchem S385 | <<locked>> | 96% | 43,381 psi | 68% | 2510 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 52,823 psi | 83% | 2484 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,297 psi | 74% | 2425 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,989 psi | 67% | 2418 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,613 psi | 68% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,665 psi | 56% | 2313 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 31,691 psi | 50% | 2267 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,936 psi | 77% | 2533 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,003 psi | 66% | 2421 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 33,460 psi | 52% | 2320 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 88% | 30,255 psi | 47% | 2310 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,502 psi | 49% | 2247 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 48,834 psi | 77% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 39,798 psi | 62% | 2467 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,397 psi | 41% | 2254 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,773 psi | 70% | 2510 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 103 powders for .375 Rem. Ultra Mag. loaded with the .375 | 270gr | Barnes LRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,795 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 1:15.5 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 270gr | Barnes LRX BT 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.