Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Swift A-Frame bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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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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>> | 88% | 56,463 psi | 87% | 2700 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,405 psi | 85% | 2799 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 57,624 psi | 89% | 2785 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,115 psi | 86% | 2799 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 58,711 psi | 90% | 2828 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 2877 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,566 psi | 89% | 2844 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,711 psi | 89% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,116 psi | 88% | 2772 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,579 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,233 psi | 90% | 2749 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,697 psi | 90% | 2822 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,100 psi | 85% | 2785 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,913 psi | 88% | 2861 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,373 psi | 81% | 2782 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,666 psi | 87% | 2759 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 55,767 psi | 86% | 2782 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,465 psi | 90% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 56,579 psi | 87% | 2792 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,231 psi | 87% | 2792 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,114 psi | 85% | 2733 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,986 psi | 89% | 2772 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,827 psi | 89% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,711 psi | 89% | 2907 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 58% | 1765 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,173 psi | 86% | 2707 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,869 psi | 88% | 2707 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,622 psi | 86% | 2713 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 58,349 psi | 90% | 2835 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,591 psi | 81% | 2772 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 58,421 psi | 90% | 2733 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,117 psi | 89% | 2720 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,464 psi | 88% | 2762 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,679 psi | 83% | 2792 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,623 psi | 87% | 2805 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,465 psi | 90% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,506 psi | 85% | 2799 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,479 psi | 88% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,421 psi | 90% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,595 psi | 59% | 1808 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 54,578 psi | 84% | 2838 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 58,334 psi | 90% | 2867 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,117 psi | 89% | 2753 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,884 psi | 88% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,421 psi | 90% | 2733 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,492 psi | 87% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,956 psi | 86% | 2694 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 56,260 psi | 87% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,290 psi | 88% | 2733 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,363 psi | 88% | 2723 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,521 psi | 87% | 2743 fps | 97% |
| Vihtavuori N555 | <<locked>> | 86% | 56,550 psi | 87% | 2733 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,057 psi | 86% | 2808 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 56,985 psi | 88% | 2802 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 58,726 psi | 90% | 2867 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 55,840 psi | 86% | 2867 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 58,755 psi | 90% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,276 psi | 88% | 2733 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% | 43,149 psi | 66% | 2503 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,628 psi | 69% | 2621 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 47,166 psi | 73% | 2625 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 42,395 psi | 65% | 2569 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 33,794 psi | 52% | 2379 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 44,309 psi | 68% | 2674 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 28,993 psi | 45% | 2297 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,041 psi | 83% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,065 psi | 72% | 2618 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,134 psi | 66% | 2575 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,756 psi | 64% | 2516 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,245 psi | 56% | 2461 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,384 psi | 73% | 2674 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,397 psi | 70% | 2671 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 44,991 psi | 69% | 2654 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,859 psi | 68% | 2543 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 40,016 psi | 62% | 2513 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 33,779 psi | 52% | 2398 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 43,134 psi | 66% | 2575 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 34,330 psi | 53% | 2395 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 45,020 psi | 69% | 2569 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,208 psi | 68% | 2556 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,763 psi | 78% | 2602 fps | 100% |
| Hodgdon Retumbo | 74.8 gr | 80% | 35,375 psi | 54% | 2500 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1585 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,765 psi | 81% | 2657 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,359 psi | 82% | 2661 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,006 psi | 71% | 2559 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,104 psi | 63% | 2552 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,809 psi | 54% | 2438 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 54,708 psi | 84% | 2684 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,101 psi | 57% | 2388 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 53,722 psi | 83% | 2710 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,514 psi | 44% | 2293 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 45,803 psi | 70% | 2641 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 54,665 psi | 84% | 2697 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,075 psi | 63% | 2562 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 53,824 psi | 83% | 2707 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,057 psi | 57% | 2448 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 76 | 80 gr | 80% | 34,606 psi | 53% | 2474 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 36,840 psi | 57% | 2493 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 47,863 psi | 74% | 2595 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 46,630 psi | 72% | 2608 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,708 psi | 84% | 2684 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,282 psi | 71% | 2602 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 48,878 psi | 75% | 2585 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 52,678 psi | 81% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,108 psi | 73% | 2582 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 41,176 psi | 63% | 2470 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 49,298 psi | 76% | 2628 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 46,427 psi | 71% | 2589 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,484 psi | 70% | 2638 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 37,826 psi | 58% | 2467 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 38,058 psi | 59% | 2510 fps | 95% |
| Vihtavuori N570 | 87.3 gr | 90% | 44,918 psi | 69% | 2677 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,074 psi | 62% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,439 psi | 67% | 2520 fps | 99% |
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 58 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,765 fps to 2,907 fps. ADI AR 2218 gives the best case fill at 100 %, and 58 of the 58 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 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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 N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Swift A-Frame 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.