Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Swift A-Frame bullet and 69 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 76 and Vihtavuori N560.
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% | 57,029 psi | 88% | 2828 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,290 psi | 88% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,985 psi | 86% | 2927 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 58,450 psi | 90% | 2917 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,608 psi | 87% | 2927 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,187 psi | 85% | 2894 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,851 psi | 80% | 2923 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,650 psi | 83% | 2913 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,552 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,479 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,885 psi | 89% | 2907 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,000 psi | 88% | 2920 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,682 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,998 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,492 psi | 85% | 2917 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,188 psi | 88% | 2979 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,479 psi | 88% | 2881 fps | 97.9% |
| Bofors RP15 | <<locked>> | 92% | 56,376 psi | 87% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 58,784 psi | 90% | 2966 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,000 psi | 88% | 2920 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 58,465 psi | 90% | 2854 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,782 psi | 87% | 2920 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,043 psi | 86% | 2861 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,697 psi | 90% | 2904 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,668 psi | 90% | 2828 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,870 psi | 89% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,043 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,624 psi | 89% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,550 psi | 87% | 2844 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 54,911 psi | 85% | 2907 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,994 psi | 75% | 2828 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,145 psi | 88% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,695 psi | 86% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,653 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,421 psi | 90% | 2897 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 2854 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,087 psi | 88% | 2940 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,506 psi | 85% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,057 psi | 86% | 2927 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,276 psi | 90% | 2894 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,520 psi | 84% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,754 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,173 psi | 86% | 2900 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,882 psi | 84% | 2966 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,784 psi | 90% | 2989 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,390 psi | 85% | 2831 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 57,624 psi | 89% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,465 psi | 90% | 2854 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,145 psi | 88% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,695 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,231 psi | 87% | 2772 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,217 psi | 88% | 2894 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,855 psi | 88% | 2818 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 56,826 psi | 87% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,986 psi | 89% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,985 psi | 88% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,899 psi | 89% | 2848 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,087 psi | 88% | 2858 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 82% | 56,304 psi | 87% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,927 psi | 88% | 2864 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,565 psi | 87% | 2940 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 57,421 psi | 88% | 2923 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 54,839 psi | 84% | 2927 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 55,941 psi | 86% | 2982 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,608 psi | 87% | 2772 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,508 psi | 90% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,160 psi | 90% | 2864 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% | 40,495 psi | 62% | 2566 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,476 psi | 82% | 2802 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,887 psi | 64% | 2674 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 44,454 psi | 68% | 2690 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 39,914 psi | 61% | 2628 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,361 psi | 56% | 2539 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 47,993 psi | 74% | 2848 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 31,096 psi | 48% | 2448 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,831 psi | 69% | 2690 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,198 psi | 79% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,425 psi | 68% | 2684 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,538 psi | 62% | 2635 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,204 psi | 60% | 2585 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,808 psi | 52% | 2513 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,164 psi | 68% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,037 psi | 75% | 2844 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,398 psi | 73% | 2713 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,637 psi | 58% | 2569 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 36,114 psi | 56% | 2556 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 40,538 psi | 62% | 2635 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 54,795 psi | 84% | 2802 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,577 psi | 53% | 2500 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 42,525 psi | 65% | 2631 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,785 psi | 64% | 2615 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,167 psi | 74% | 2687 fps | 100% |
| Hodgdon Retumbo | 76.2 gr | 80% | 33,098 psi | 51% | 2536 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 43% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,140 psi | 77% | 2736 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,459 psi | 78% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,671 psi | 67% | 2625 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,595 psi | 59% | 2605 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,101 psi | 57% | 2595 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,214 psi | 80% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,824 psi | 54% | 2448 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 50,923 psi | 78% | 2782 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,342 psi | 47% | 2444 fps | 95% |
| Norma MRP | <<locked>> | 80% | 42,844 psi | 66% | 2703 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 51,938 psi | 80% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,435 psi | 59% | 2615 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 50,966 psi | 78% | 2785 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,432 psi | 53% | 2493 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,853 psi | 83% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,286 psi | 80% | 2844 fps | 100% |
| ReloadSwiss RS 76 | 81.5 gr | 80% | 32,300 psi | 50% | 2510 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,798 psi | 61% | 2661 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 45,556 psi | 70% | 2667 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,048 psi | 68% | 2674 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 54,795 psi | 84% | 2802 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,214 psi | 80% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,692 psi | 81% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,700 psi | 67% | 2671 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 46,528 psi | 72% | 2654 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 49,501 psi | 76% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,570 psi | 69% | 2654 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,330 psi | 82% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,711 psi | 60% | 2530 fps | 97.7% |
| Vihtavuori N170 | <<locked>> | 94% | 53,432 psi | 82% | 2802 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 52,808 psi | 81% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,743 psi | 67% | 2664 fps | 100% |
| Vihtavuori N560 | 79 gr | 80% | 42,656 psi | 66% | 2694 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 37,855 psi | 58% | 2572 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 88% | 41,002 psi | 63% | 2677 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 48,370 psi | 74% | 2854 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,881 psi | 81% | 2726 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,651 psi | 56% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,959 psi | 63% | 2582 fps | 97.8% |
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 69 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,035 fps. ADI AR 2218 gives the best case fill at 100 %, and 69 of the 69 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 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | 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.