Load Specifications
Bullet Manufacturer:Alaska Bullet Works
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 | Alaska Bullet Works Kodiak PP SPBC 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 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% | 54,447 psi | 85% | 2585 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,072 psi | 88% | 2641 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,168 psi | 77% | 2618 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 54,621 psi | 86% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,129 psi | 86% | 2723 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,522 psi | 90% | 2707 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,100 psi | 86% | 2661 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 2756 fps | 98% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,188 psi | 88% | 2654 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,085 psi | 85% | 2772 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,651 psi | 87% | 2680 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,057 psi | 88% | 2703 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,825 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,203 psi | 90% | 2802 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,492 psi | 87% | 2746 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 2690 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,137 psi | 72% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,350 psi | 63% | 2556 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,779 psi | 83% | 2815 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,682 psi | 90% | 2723 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,594 psi | 89% | 2697 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 2690 fps | 96.9% |
| Bofors RP7 | <<locked>> | 92% | 56,159 psi | 88% | 2680 fps | 98.7% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,508 psi | 90% | 2635 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,202 psi | 88% | 2684 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,159 psi | 90% | 2713 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 57,551 psi | 90% | 2772 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 92% | 57,464 psi | 90% | 2733 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 82% | 54,563 psi | 86% | 2667 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,985 psi | 88% | 2700 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,708 psi | 86% | 2700 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,940 psi | 85% | 2749 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,071 psi | 57% | 1660 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,608 psi | 87% | 2667 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,042 psi | 86% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,621 psi | 86% | 2644 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,609 psi | 90% | 2677 fps | 99.2% |
| IMR 4350 | <<locked>> | 96% | 56,869 psi | 89% | 2707 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,447 psi | 85% | 2657 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 55,593 psi | 87% | 2717 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,522 psi | 90% | 2730 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2690 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 82% | 56,188 psi | 88% | 2654 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,230 psi | 85% | 2635 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,391 psi | 88% | 2631 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,795 psi | 86% | 2641 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,595 psi | 90% | 2700 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 55,376 psi | 87% | 2690 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,669 psi | 64% | 2477 fps | 97.3% |
| Norma 201 | <<locked>> | 84% | 56,260 psi | 88% | 2651 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,869 psi | 89% | 2648 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,332 psi | 87% | 2690 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,711 psi | 90% | 2756 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2769 fps | 98.7% |
| Norma URP | <<locked>> | 96% | 57,493 psi | 90% | 2759 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,086 psi | 88% | 2713 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,231 psi | 88% | 2759 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 56,463 psi | 88% | 2680 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,362 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,637 psi | 57% | 1699 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,087 psi | 89% | 2697 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,956 psi | 89% | 2769 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,971 psi | 89% | 2799 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,810 psi | 86% | 2743 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,595 psi | 90% | 2825 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,971 psi | 89% | 2628 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,884 psi | 89% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,594 psi | 89% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,462 psi | 85% | 2677 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 2730 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 92% | 56,159 psi | 88% | 2680 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,595 psi | 90% | 2700 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,230 psi | 85% | 2635 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,795 psi | 86% | 2641 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,376 psi | 87% | 2690 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,549 psi | 85% | 2700 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,259 psi | 87% | 2661 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,985 psi | 88% | 2677 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,246 psi | 90% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,592 psi | 86% | 2546 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,186 psi | 85% | 2608 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2726 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 56,869 psi | 89% | 2585 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,795 psi | 86% | 2648 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,492 psi | 89% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 56,492 psi | 89% | 2671 fps | 96.1% |
| Somchem S365 | <<locked>> | 98% | 56,420 psi | 88% | 2759 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 2710 fps | 98.7% |
| Vihtavuori N133 | <<locked>> | 84% | 57,667 psi | 90% | 2569 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,043 psi | 89% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,450 psi | 90% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,476 psi | 85% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,231 psi | 88% | 2703 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,674 psi | 75% | 2582 fps | 97% |
| Vihtavuori N530 | <<locked>> | 82% | 56,797 psi | 89% | 2654 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,709 psi | 87% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,201 psi | 87% | 2710 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,547 psi | 81% | 2710 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,985 psi | 88% | 2674 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,217 psi | 90% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,725 psi | 90% | 2776 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,510 psi | 65% | 2680 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,072 psi | 88% | 2684 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 2651 fps | 97.1% |
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% | 47,834 psi | 75% | 2497 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,035 psi | 72% | 2487 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 34,824 psi | 55% | 2362 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 45,252 psi | 71% | 2500 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,910 psi | 53% | 2359 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 80% | 50,676 psi | 79% | 2612 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,105 psi | 68% | 2474 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 94% | 46,354 psi | 73% | 2602 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,765 psi | 83% | 2608 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,036 psi | 74% | 2664 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,279 psi | 68% | 2497 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,253 psi | 72% | 2556 fps | 99.7% |
| Alliant Reloder-16 | 73.7 gr | 80% | 33,518 psi | 53% | 2369 fps | 97% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,724 psi | 59% | 2487 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,888 psi | 67% | 2539 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 42,931 psi | 67% | 2585 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,063 psi | 41% | 2188 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,489 psi | 52% | 2395 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,807 psi | 50% | 2398 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,386 psi | 79% | 2621 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,294 psi | 68% | 2503 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 42,931 psi | 67% | 2585 fps | 95.2% |
| Bofors RP7 | <<locked>> | 82% | 41,060 psi | 64% | 2431 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,201 psi | 85% | 2592 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,547 psi | 82% | 2635 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,932 psi | 69% | 2513 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 38,464 psi | 60% | 2454 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 41,771 psi | 65% | 2477 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 51,198 psi | 80% | 2618 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,111 psi | 49% | 2277 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,703 psi | 75% | 2602 fps | 100% |
| Hodgdon Superformance | 88.1 gr | 84% | 40,408 psi | 63% | 2516 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 42% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,081 psi | 77% | 2572 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,663 psi | 81% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,324 psi | 71% | 2503 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,718 psi | 75% | 2526 fps | 97.8% |
| IMR 4350 | <<locked>> | 86% | 41,568 psi | 65% | 2461 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,900 psi | 63% | 2411 fps | 95.7% |
| IMR 4831 | <<locked>> | 80% | 32,779 psi | 51% | 2320 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 47,413 psi | 74% | 2582 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,620 psi | 82% | 2641 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 52,765 psi | 83% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,647 psi | 79% | 2585 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,067 psi | 78% | 2543 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,498 psi | 71% | 2507 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,478 psi | 59% | 2365 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 38,072 psi | 60% | 2395 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 35,723 psi | 56% | 2382 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 49,676 psi | 78% | 2562 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,212 psi | 79% | 2562 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,658 psi | 72% | 2546 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 43,990 psi | 69% | 2539 fps | 95.1% |
| Norma MRP | <<locked>> | 92% | 39,407 psi | 62% | 2543 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 34,011 psi | 53% | 2359 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 45,788 psi | 72% | 2562 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,244 psi | 55% | 2392 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 52,750 psi | 83% | 2625 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,750 psi | 83% | 2641 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 43% | 1522 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,077 psi | 69% | 2493 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,676 psi | 78% | 2664 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,147 psi | 63% | 2543 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,576 psi | 53% | 2372 fps | 96.4% |
| ReloadSwiss RS 70 | 80.7 gr | 80% | 33,185 psi | 52% | 2375 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 53,664 psi | 84% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,253 psi | 74% | 2516 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,799 psi | 64% | 2454 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 47,964 psi | 75% | 2575 fps | 95% |
| Rottweil R 905 | <<locked>> | 94% | 44,570 psi | 70% | 2575 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 82% | 41,060 psi | 64% | 2431 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,478 psi | 59% | 2365 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,647 psi | 79% | 2585 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,498 psi | 71% | 2507 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,072 psi | 60% | 2395 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,858 psi | 66% | 2503 fps | 99.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,445 psi | 81% | 2608 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,226 psi | 77% | 2582 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,575 psi | 79% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,525 psi | 67% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,160 psi | 61% | 2362 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,150 psi | 69% | 2569 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 50,343 psi | 79% | 2500 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,271 psi | 80% | 2598 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,336 psi | 65% | 2457 fps | 99.7% |
| Somchem S361 | <<locked>> | 96% | 52,881 psi | 83% | 2618 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 30,545 psi | 48% | 2316 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 39,726 psi | 62% | 2454 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 51,039 psi | 80% | 2487 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,224 psi | 74% | 2487 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,558 psi | 75% | 2497 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,378 psi | 62% | 2392 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,346 psi | 55% | 2359 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 41,771 psi | 65% | 2480 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 53,055 psi | 83% | 2605 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,963 psi | 72% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,925 psi | 55% | 2359 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 82% | 28,282 psi | 44% | 2260 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,824 psi | 55% | 2333 fps | 98.9% |
| Winchester 748 | <<locked>> | 80% | 53,664 psi | 84% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,609 psi | 61% | 2457 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,208 psi | 41% | 2264 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,008 psi | 77% | 2585 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 45,020 psi | 71% | 2543 fps | 95.5% |
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 | Alaska Bullet Works Kodiak PP SPBC. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,825 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 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 Reloder-19 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 | Alaska Bullet Works Kodiak PP SPBC 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.