Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Frontier PH HPFB bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N570.
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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 58,102 psi | 89% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,508 psi | 90% | 2736 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,087 psi | 88% | 2822 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 55,695 psi | 86% | 2753 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 57,856 psi | 89% | 2818 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,173 psi | 86% | 2789 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,808 psi | 81% | 2831 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,810 psi | 84% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,840 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,245 psi | 85% | 2743 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,204 psi | 90% | 2812 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,999 psi | 86% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,115 psi | 86% | 2789 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,826 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,305 psi | 90% | 2881 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 2736 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,450 psi | 90% | 2779 fps | 98.6% |
| Bofors RP15 | <<locked>> | 92% | 57,377 psi | 88% | 2802 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,014 psi | 86% | 2802 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 58,204 psi | 90% | 2812 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,798 psi | 89% | 2812 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,058 psi | 88% | 2756 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,985 psi | 86% | 2743 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,883 psi | 86% | 2664 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,230 psi | 85% | 2871 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 58% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,059 psi | 89% | 2726 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,697 psi | 90% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,508 psi | 89% | 2736 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,144 psi | 86% | 2802 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,082 psi | 77% | 2733 fps | 99.5% |
| Lovex S065 | <<locked>> | 82% | 58,204 psi | 90% | 2703 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,666 psi | 87% | 2707 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,970 psi | 86% | 2690 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,593 psi | 86% | 2733 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,010 psi | 79% | 2756 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,233 psi | 90% | 2828 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,579 psi | 87% | 2720 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,276 psi | 88% | 2822 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,564 psi | 86% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,796 psi | 86% | 2753 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,551 psi | 59% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,711 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,348 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,028 psi | 86% | 2858 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,448 psi | 85% | 2828 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 56,275 psi | 87% | 2723 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 58,740 psi | 90% | 2785 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,204 psi | 90% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,666 psi | 87% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,246 psi | 88% | 2661 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,320 psi | 90% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,972 psi | 89% | 2717 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 58,030 psi | 89% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,492 psi | 85% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,117 psi | 89% | 2710 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,230 psi | 85% | 2690 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,262 psi | 90% | 2762 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 82% | 57,348 psi | 88% | 2717 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,160 psi | 90% | 2753 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,711 psi | 89% | 2831 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 58,552 psi | 90% | 2818 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 55,970 psi | 86% | 2825 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 57,116 psi | 88% | 2884 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,653 psi | 89% | 2661 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,666 psi | 86% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,143 psi | 85% | 2700 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 3100 | <<locked>> | 80% | 41,466 psi | 64% | 2470 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 54,694 psi | 84% | 2687 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,989 psi | 66% | 2589 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 45,440 psi | 70% | 2592 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,785 psi | 63% | 2536 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 34,795 psi | 54% | 2402 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 96% | 45,484 psi | 70% | 2694 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 27,818 psi | 43% | 2257 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,156 psi | 80% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,411 psi | 70% | 2585 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,466 psi | 64% | 2543 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,277 psi | 62% | 2490 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,679 psi | 53% | 2428 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,324 psi | 70% | 2641 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,062 psi | 66% | 2628 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 45,948 psi | 71% | 2674 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,281 psi | 70% | 2562 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,522 psi | 59% | 2484 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 34,563 psi | 53% | 2418 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 41,466 psi | 64% | 2543 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 32,982 psi | 51% | 2359 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 43,424 psi | 67% | 2536 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,612 psi | 66% | 2523 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,211 psi | 76% | 2575 fps | 100% |
| Hodgdon Retumbo | 72.3 gr | 80% | 33,866 psi | 52% | 2461 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 43% | 1572 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,097 psi | 79% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,488 psi | 79% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,512 psi | 69% | 2530 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,436 psi | 61% | 2516 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,214 psi | 51% | 2402 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 54,795 psi | 84% | 2657 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,127 psi | 82% | 2657 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,723 psi | 55% | 2359 fps | 99% |
| Norma 204 | <<locked>> | 80% | 52,040 psi | 80% | 2680 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,138 psi | 45% | 2313 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 43,859 psi | 68% | 2605 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 52,953 psi | 81% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,378 psi | 61% | 2523 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 52,098 psi | 80% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,389 psi | 54% | 2411 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,998 psi | 85% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,374 psi | 82% | 2733 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,127 psi | 51% | 2434 fps | 98.1% |
| ReloadSwiss RS 80 | 83.9 gr | 86% | 37,811 psi | 58% | 2516 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,398 psi | 71% | 2569 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 45,034 psi | 69% | 2575 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,795 psi | 84% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,127 psi | 82% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,664 psi | 83% | 2612 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,686 psi | 69% | 2572 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 47,326 psi | 73% | 2556 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 50,647 psi | 78% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,455 psi | 70% | 2552 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 54,447 psi | 84% | 2661 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,610 psi | 61% | 2438 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 50,763 psi | 78% | 2648 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 53,838 psi | 83% | 2671 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,686 psi | 69% | 2559 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,642 psi | 67% | 2602 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 36,245 psi | 56% | 2431 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 39,073 psi | 60% | 2533 fps | 95.3% |
| Vihtavuori N570 | 86.3 gr | 92% | 46,006 psi | 71% | 2700 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,896 psi | 83% | 2615 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,956 psi | 58% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,887 psi | 64% | 2490 fps | 98.6% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Frontier PH HPFB. Vihtavuori N570 delivers the highest muzzle velocity at 2,884 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,884 fps. Accurate 8700 gives the best case fill at 100 %, and 74 of the 74 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Frontier PH HPFB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.