Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Rem. Ultra Mag. load data
Case Length (l3):2.76"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:110 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:13.0
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Peregrine Bushmaster (VRG-3) bullet and 166 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP and Accurate MAGPRO.
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 3100 | <<locked>> | 96% | 55,201 psi | 87% | 2605 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 55,013 psi | 86% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,811 psi | 89% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,550 psi | 89% | 2635 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,927 psi | 89% | 2749 fps | 99.4% |
| Accurate High Country | <<locked>> | 94% | 56,681 psi | 89% | 2746 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 53,896 psi | 84% | 2697 fps | 98.1% |
| Accurate MAGPRO | <<locked>> | 96% | 57,595 psi | 90% | 2746 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 82% | 54,911 psi | 86% | 2559 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 54,665 psi | 86% | 2556 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,273 psi | 85% | 2644 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 54,041 psi | 85% | 2641 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 96% | 55,564 psi | 87% | 2700 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 55,390 psi | 87% | 2697 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,238 psi | 72% | 2546 fps | 97.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,064 psi | 72% | 2543 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,075 psi | 64% | 2513 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,756 psi | 64% | 2503 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,404 psi | 85% | 2641 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,404 psi | 85% | 2641 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,157 psi | 85% | 2638 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,985 psi | 88% | 2575 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,709 psi | 87% | 2572 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,244 psi | 85% | 2644 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,696 psi | 90% | 2687 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,317 psi | 87% | 2654 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,056 psi | 86% | 2651 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,435 psi | 90% | 2687 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,014 psi | 89% | 2677 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,274 psi | 87% | 2694 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,056 psi | 86% | 2690 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,318 psi | 88% | 2661 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,115 psi | 88% | 2657 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2671 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,721 psi | 81% | 2664 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,884 psi | 89% | 2749 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,637 psi | 89% | 2746 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,711 psi | 90% | 2664 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,624 psi | 90% | 2661 fps | 97% |
| Bofors RP15 | <<locked>> | 98% | 54,215 psi | 85% | 2677 fps | 99.6% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,638 psi | 90% | 2723 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 57,000 psi | 89% | 2592 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 56,724 psi | 89% | 2589 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,863 psi | 75% | 2612 fps | 98.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,688 psi | 75% | 2608 fps | 98.4% |
| Bofors RP5 | <<locked>> | 96% | 55,274 psi | 87% | 2694 fps | 99.7% |
| Bofors RP5 | <<locked>> | 96% | 55,056 psi | 86% | 2690 fps | 99.7% |
| Bofors RP7 | <<locked>> | 86% | 56,028 psi | 88% | 2595 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 55,840 psi | 88% | 2589 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 2631 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,908 psi | 80% | 2625 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 82% | 57,029 psi | 89% | 2612 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 56,985 psi | 89% | 2612 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,042 psi | 86% | 2641 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,824 psi | 86% | 2638 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 54,346 psi | 85% | 2602 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 54,128 psi | 85% | 2598 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 94% | 55,651 psi | 87% | 2644 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 94% | 55,477 psi | 87% | 2638 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,563 psi | 86% | 2628 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,186 psi | 85% | 2621 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,491 psi | 85% | 2572 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,244 psi | 85% | 2566 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2730 fps | 99.9% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,604 psi | 79% | 2723 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 55,521 psi | 87% | 2677 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 55,317 psi | 87% | 2674 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1627 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1627 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,551 psi | 90% | 2582 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,551 psi | 90% | 2628 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,348 psi | 90% | 2625 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,711 psi | 90% | 2618 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,493 psi | 90% | 2612 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 57,348 psi | 90% | 2631 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 57,116 psi | 90% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,753 psi | 89% | 2628 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,594 psi | 89% | 2625 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 98% | 57,058 psi | 89% | 2730 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 98% | 56,855 psi | 89% | 2726 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 54,433 psi | 85% | 2566 fps | 100% |
| Lovex S065 | <<locked>> | 86% | 54,404 psi | 85% | 2562 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,086 psi | 88% | 2608 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,869 psi | 88% | 2605 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,663 psi | 83% | 2572 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,257 psi | 82% | 2566 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,882 psi | 86% | 2631 fps | 99.5% |
| Norma 204 | <<locked>> | 88% | 54,679 psi | 86% | 2628 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 36,448 psi | 57% | 2438 fps | 97.5% |
| Norma 217ᴾ | <<locked>> | 100% | 36,114 psi | 57% | 2431 fps | 97.3% |
| Norma MRP | <<locked>> | 94% | 55,042 psi | 86% | 2713 fps | 100% |
| Norma MRP | <<locked>> | 94% | 54,824 psi | 86% | 2710 fps | 100% |
| Norma URP | <<locked>> | 88% | 55,448 psi | 87% | 2625 fps | 100% |
| Norma URP | <<locked>> | 88% | 55,201 psi | 87% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,766 psi | 84% | 2694 fps | 99.2% |
| Ramshot Grand | <<locked>> | 96% | 53,606 psi | 84% | 2690 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 54,244 psi | 85% | 2631 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 54,041 psi | 85% | 2628 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,057 psi | 88% | 2687 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2684 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1667 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,942 psi | 89% | 2605 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,710 psi | 89% | 2598 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,882 psi | 86% | 2644 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,636 psi | 86% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,000 psi | 89% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,768 psi | 89% | 2657 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,361 psi | 87% | 2690 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,100 psi | 86% | 2684 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,285 psi | 80% | 2726 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2720 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 46,166 psi | 72% | 2615 fps | 96.8% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 45,847 psi | 72% | 2608 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 84% | 57,101 psi | 89% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 57,058 psi | 89% | 2589 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,593 psi | 87% | 2618 fps | 99% |
| Rottweil R 904 | <<locked>> | 92% | 55,405 psi | 87% | 2612 fps | 99% |
| Rottweil R 905 | <<locked>> | 94% | 56,666 psi | 89% | 2674 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 94% | 56,463 psi | 88% | 2667 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 56,028 psi | 88% | 2595 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 55,840 psi | 88% | 2589 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,433 psi | 85% | 2566 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,404 psi | 85% | 2562 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,086 psi | 88% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,869 psi | 88% | 2605 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,172 psi | 86% | 2598 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,926 psi | 86% | 2595 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,261 psi | 90% | 2470 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,261 psi | 90% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,464 psi | 90% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,290 psi | 90% | 2566 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,217 psi | 88% | 2667 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,014 psi | 88% | 2664 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 56,797 psi | 89% | 2585 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 56,753 psi | 89% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,276 psi | 90% | 2612 fps | 98.7% |
| Somchem S361 | <<locked>> | 92% | 56,927 psi | 89% | 2605 fps | 98.6% |
| Somchem S365 | <<locked>> | 90% | 55,521 psi | 87% | 2625 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 55,274 psi | 87% | 2621 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,290 psi | 90% | 2648 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,898 psi | 89% | 2641 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 54,563 psi | 86% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 54,549 psi | 85% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,319 psi | 90% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,087 psi | 89% | 2612 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,898 psi | 89% | 2628 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 98% | 56,478 psi | 89% | 2621 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 56,449 psi | 88% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 56,231 psi | 88% | 2618 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,955 psi | 86% | 2641 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,520 psi | 85% | 2635 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,027 psi | 86% | 2710 fps | 98.7% |
| Vihtavuori N560 | <<locked>> | 94% | 54,795 psi | 86% | 2707 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 2687 fps | 98.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 2680 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2625 fps | 96.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,253 psi | 74% | 2618 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,130 psi | 90% | 2579 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,724 psi | 89% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,259 psi | 87% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,027 psi | 86% | 2641 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2785 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,479 psi | 90% | 2785 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,421 psi | 90% | 2644 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,203 psi | 90% | 2641 fps | 99.7% |
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 3100 | <<locked>> | 80% | 31,604 psi | 50% | 2205 fps | 97% |
| Accurate 3100 | <<locked>> | 80% | 31,546 psi | 49% | 2205 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 42,975 psi | 67% | 2441 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,902 psi | 67% | 2438 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 37,072 psi | 58% | 2408 fps | 95% |
| Accurate High Country | <<locked>> | 84% | 39,639 psi | 62% | 2461 fps | 95.9% |
| Accurate MAGPRO | 81.3 gr | 88% | 43,526 psi | 68% | 2526 fps | 95.7% |
| Accurate MAGPRO | 81.3 gr | 88% | 43,163 psi | 68% | 2516 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 51,576 psi | 81% | 2513 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 51,343 psi | 80% | 2510 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,187 psi | 57% | 2329 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 36,013 psi | 56% | 2326 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 39,465 psi | 62% | 2425 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 39,291 psi | 62% | 2418 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 94% | 37,855 psi | 59% | 2385 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 37,724 psi | 59% | 2379 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 31,459 psi | 49% | 2290 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 31,328 psi | 49% | 2283 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,361 psi | 57% | 2329 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,361 psi | 57% | 2329 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,332 psi | 57% | 2326 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,533 psi | 82% | 2533 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,301 psi | 82% | 2530 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,524 psi | 65% | 2451 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,437 psi | 65% | 2448 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,037 psi | 75% | 2556 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,776 psi | 75% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,027 psi | 56% | 2323 fps | 95.7% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,969 psi | 56% | 2323 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,185 psi | 54% | 2320 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,011 psi | 53% | 2316 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,560 psi | 48% | 2238 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,501 psi | 48% | 2234 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,716 psi | 42% | 2149 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,355 psi | 44% | 2198 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,228 psi | 52% | 2356 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,054 psi | 52% | 2352 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,908 psi | 80% | 2559 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,763 psi | 80% | 2556 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 36,376 psi | 57% | 2369 fps | 95.9% |
| Bofors RP15 | <<locked>> | 86% | 36,172 psi | 57% | 2362 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 53,243 psi | 83% | 2546 fps | 100% |
| Bofors RP3 | <<locked>> | 80% | 52,997 psi | 83% | 2543 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 36,201 psi | 57% | 2395 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 36,042 psi | 56% | 2388 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 34,185 psi | 54% | 2320 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 34,011 psi | 53% | 2316 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 46,180 psi | 72% | 2448 fps | 99.1% |
| Bofors RP7 | <<locked>> | 80% | 46,137 psi | 72% | 2444 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 36,114 psi | 57% | 2349 fps | 95.1% |
| Hodgdon H1000 | <<locked>> | 90% | 35,969 psi | 56% | 2346 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 53,490 psi | 84% | 2566 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 53,243 psi | 83% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,049 psi | 71% | 2490 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 44,831 psi | 70% | 2484 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 47,747 psi | 75% | 2503 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 47,514 psi | 74% | 2500 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 42,221 psi | 66% | 2431 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 86% | 42,047 psi | 66% | 2425 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,394 psi | 65% | 2415 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,249 psi | 65% | 2411 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,117 psi | 61% | 2346 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,899 psi | 61% | 2343 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,924 psi | 53% | 2382 fps | 95.6% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,765 psi | 53% | 2375 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 44,309 psi | 69% | 2510 fps | 99.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,106 psi | 69% | 2503 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1453 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 43% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,998 psi | 85% | 2536 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,916 psi | 66% | 2388 fps | 98.4% |
| IMR 4350 | <<locked>> | 80% | 41,698 psi | 65% | 2385 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,761 psi | 75% | 2474 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,543 psi | 75% | 2467 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 41,147 psi | 64% | 2395 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 40,915 psi | 64% | 2392 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,220 psi | 65% | 2379 fps | 95.5% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,031 psi | 64% | 2372 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 40,567 psi | 64% | 2457 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 88% | 40,379 psi | 63% | 2451 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 45,121 psi | 71% | 2425 fps | 99.8% |
| Lovex S065 | <<locked>> | 80% | 45,078 psi | 71% | 2425 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 43,468 psi | 68% | 2415 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 43,221 psi | 68% | 2411 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 29,008 psi | 45% | 2142 fps | 95.9% |
| Lovex S071 | <<locked>> | 82% | 28,848 psi | 45% | 2139 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 41,655 psi | 65% | 2418 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 41,437 psi | 65% | 2415 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 31,749 psi | 50% | 2326 fps | 95.4% |
| Norma 217 | <<locked>> | 96% | 31,618 psi | 50% | 2323 fps | 95.3% |
| Norma MRP | 72.6 gr | 80% | 33,257 psi | 52% | 2326 fps | 96.4% |
| Norma MRP | 72.6 gr | 80% | 33,054 psi | 52% | 2320 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 42,540 psi | 67% | 2434 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 42,322 psi | 66% | 2428 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 37,347 psi | 59% | 2405 fps | 95.2% |
| Ramshot Grand | <<locked>> | 86% | 37,173 psi | 58% | 2398 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 41,379 psi | 65% | 2428 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 80% | 41,162 psi | 65% | 2425 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 33,025 psi | 52% | 2290 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 86% | 32,880 psi | 52% | 2287 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,127 psi | 83% | 2552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,127 psi | 83% | 2549 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,053 psi | 80% | 2595 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,821 psi | 80% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,076 psi | 68% | 2461 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,830 psi | 67% | 2457 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,481 psi | 65% | 2477 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,263 psi | 65% | 2470 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,835 psi | 48% | 2300 fps | 95.3% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,705 psi | 48% | 2293 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,757 psi | 67% | 2552 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,453 psi | 67% | 2546 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 50,154 psi | 79% | 2500 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 49,893 psi | 78% | 2493 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 37,623 psi | 59% | 2316 fps | 95% |
| Rottweil R 904 | <<locked>> | 82% | 39,958 psi | 63% | 2359 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 35,259 psi | 55% | 2310 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 35,056 psi | 55% | 2303 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,180 psi | 72% | 2448 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 80% | 46,137 psi | 72% | 2444 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,121 psi | 71% | 2425 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,078 psi | 71% | 2425 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 43,468 psi | 68% | 2415 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 43,221 psi | 68% | 2411 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,605 psi | 81% | 2552 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,372 psi | 81% | 2546 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,589 psi | 79% | 2392 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,560 psi | 79% | 2388 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,193 psi | 69% | 2379 fps | 99.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,976 psi | 69% | 2372 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,940 psi | 55% | 2303 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,737 psi | 54% | 2300 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 50,053 psi | 78% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 49,980 psi | 78% | 2493 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 40,857 psi | 64% | 2352 fps | 95.2% |
| Somchem S361 | <<locked>> | 82% | 40,712 psi | 64% | 2349 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 39,378 psi | 62% | 2392 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 39,131 psi | 61% | 2388 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,810 psi | 56% | 2297 fps | 96.8% |
| Somchem S385 | <<locked>> | 80% | 35,607 psi | 56% | 2290 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 47,979 psi | 75% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 47,761 psi | 75% | 2425 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,918 psi | 69% | 2428 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,845 psi | 69% | 2425 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,112 psi | 52% | 2231 fps | 95.4% |
| Vihtavuori N165 | <<locked>> | 82% | 32,938 psi | 52% | 2224 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,381 psi | 68% | 2434 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 80% | 43,149 psi | 68% | 2428 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 34,301 psi | 54% | 2306 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 34,069 psi | 53% | 2300 fps | 99.4% |
| Vihtavuori N560 | 78 gr | 86% | 41,466 psi | 65% | 2484 fps | 95.8% |
| Vihtavuori N560 | 78 gr | 86% | 41,278 psi | 65% | 2480 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 90% | 38,421 psi | 60% | 2415 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 92% | 41,046 psi | 64% | 2464 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 98% | 44,164 psi | 69% | 2566 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 43,990 psi | 69% | 2559 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,163 psi | 68% | 2395 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,960 psi | 67% | 2392 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,049 psi | 71% | 2490 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 45,020 psi | 71% | 2487 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,963 psi | 42% | 2241 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,818 psi | 42% | 2238 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 34,998 psi | 55% | 2277 fps | 95.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 34,795 psi | 55% | 2270 fps | 95.3% |
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 166 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Peregrine Bushmaster (VRG-3). Winchester StaBALL HD delivers the highest muzzle velocity at 2,785 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,785 fps. ADI AR 2217 gives the best case fill at 100 %, and 166 of the 166 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 250.0 gr projectile in 0.338" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2217, ADI AR 2225 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 250gr | Peregrine Bushmaster (VRG-3) 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.