Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 184gr | SUS-TAC HP bullet and 72 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 Winchester StaBALL HD.
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>> | 92% | 58,334 psi | 90% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,056 psi | 85% | 2795 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,217 psi | 88% | 2920 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 56,072 psi | 86% | 2854 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 58,044 psi | 89% | 2920 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,231 psi | 87% | 2884 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,850 psi | 78% | 2848 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,217 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,622 psi | 86% | 2844 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,334 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,057 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,057 psi | 86% | 2890 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,913 psi | 88% | 2913 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,722 psi | 83% | 2904 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,361 psi | 85% | 2818 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 57,479 psi | 88% | 2900 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 55,738 psi | 86% | 2894 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 58,334 psi | 90% | 2913 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 56,710 psi | 87% | 2795 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 58,088 psi | 89% | 2910 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 56,695 psi | 87% | 2848 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,755 psi | 90% | 2858 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,493 psi | 88% | 2854 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,420 psi | 87% | 2838 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,376 psi | 87% | 2772 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,839 psi | 84% | 2966 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,609 psi | 89% | 2881 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,682 psi | 90% | 2831 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,059 psi | 89% | 2815 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,419 psi | 85% | 2785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,102 psi | 89% | 2838 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 56,188 psi | 86% | 2897 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,369 psi | 71% | 2762 fps | 98.5% |
| Lovex S065 | <<locked>> | 82% | 55,347 psi | 85% | 2762 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,305 psi | 88% | 2812 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,985 psi | 86% | 2789 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,289 psi | 87% | 2838 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 46,978 psi | 72% | 2789 fps | 99.8% |
| Norma MRP | <<locked>> | 90% | 58,407 psi | 90% | 2930 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,058 psi | 88% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,305 psi | 88% | 2920 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,101 psi | 86% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,796 psi | 86% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,405 psi | 85% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,914 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,869 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,274 psi | 85% | 2913 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 56,884 psi | 88% | 2822 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 55,245 psi | 85% | 2835 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 56,710 psi | 87% | 2795 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,347 psi | 85% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,305 psi | 88% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,102 psi | 89% | 2769 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,653 psi | 90% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 58,653 psi | 90% | 2815 fps | 99.3% |
| Somchem S365 | <<locked>> | 86% | 58,262 psi | 90% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,811 psi | 86% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,697 psi | 90% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,535 psi | 85% | 2785 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 58,624 psi | 90% | 2854 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 84% | 58,059 psi | 89% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,073 psi | 89% | 2851 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,957 psi | 89% | 2930 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 58,639 psi | 90% | 2917 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 55,796 psi | 86% | 2917 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 2972 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,508 psi | 90% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,695 psi | 87% | 2848 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,187 psi | 85% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,724 psi | 86% | 2802 fps | 99.8% |
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% | 38,783 psi | 60% | 2507 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 51,401 psi | 79% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,018 psi | 66% | 2674 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 42,685 psi | 66% | 2631 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 38,218 psi | 59% | 2562 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 88% | 37,347 psi | 57% | 2536 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 84% | 29,602 psi | 46% | 2385 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,197 psi | 76% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,728 psi | 66% | 2625 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,711 psi | 60% | 2575 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,449 psi | 58% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,285 psi | 50% | 2454 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,843 psi | 64% | 2677 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 46,093 psi | 71% | 2769 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,805 psi | 75% | 2707 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 36,085 psi | 56% | 2513 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 36,796 psi | 57% | 2552 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 38,711 psi | 60% | 2575 fps | 97.2% |
| Bofors RP7 | <<locked>> | 80% | 53,127 psi | 82% | 2743 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 35,520 psi | 55% | 2497 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 52,866 psi | 81% | 2792 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 55,071 psi | 85% | 2805 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 40,814 psi | 63% | 2569 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,059 psi | 62% | 2552 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,296 psi | 71% | 2631 fps | 100% |
| Hodgdon Retumbo | 74.1 gr | 82% | 33,765 psi | 52% | 2536 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 53,461 psi | 82% | 2822 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 43% | 1631 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,414 psi | 75% | 2680 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,476 psi | 84% | 2766 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,733 psi | 75% | 2690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,134 psi | 65% | 2569 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 36,985 psi | 57% | 2546 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,623 psi | 58% | 2589 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 52,098 psi | 80% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,560 psi | 78% | 2713 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,344 psi | 51% | 2388 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 49,081 psi | 76% | 2723 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 30,734 psi | 47% | 2438 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 40,959 psi | 63% | 2644 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 50,154 psi | 77% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,579 psi | 56% | 2546 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 49,066 psi | 76% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,793 psi | 50% | 2431 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,660 psi | 44% | 1670 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,648 psi | 79% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,893 psi | 77% | 2785 fps | 100% |
| ReloadSwiss RS 76 | 77.4 gr | 80% | 30,748 psi | 47% | 2444 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,480 psi | 62% | 2657 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 43,859 psi | 68% | 2608 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 42,250 psi | 65% | 2615 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 53,127 psi | 82% | 2743 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,098 psi | 80% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,560 psi | 78% | 2713 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,995 psi | 78% | 2667 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,916 psi | 65% | 2612 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 44,773 psi | 69% | 2595 fps | 96.9% |
| Somchem S365 | <<locked>> | 80% | 47,442 psi | 73% | 2684 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,772 psi | 66% | 2592 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 51,445 psi | 79% | 2720 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,144 psi | 57% | 2470 fps | 97.2% |
| Vihtavuori N170 | <<locked>> | 96% | 54,694 psi | 84% | 2792 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,894 psi | 78% | 2723 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,771 psi | 64% | 2605 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,872 psi | 63% | 2635 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 38,740 psi | 60% | 2569 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 41,756 psi | 64% | 2671 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 96% | 49,153 psi | 76% | 2844 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,865 psi | 78% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,069 psi | 82% | 2795 fps | 100% |
| Winchester StaBALL HD | 74.3 gr | 80% | 34,447 psi | 53% | 2569 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,262 psi | 60% | 2523 fps | 97.3% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 184gr | SUS-TAC HP. Vihtavuori N570 delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,821 fps to 2,972 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 184.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 184gr | SUS-TAC HP 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.