Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Sierra HP MatchKing 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 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% | 56,594 psi | 87% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,029 psi | 88% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,579 psi | 86% | 2923 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 58,001 psi | 89% | 2913 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 56,376 psi | 87% | 2923 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,697 psi | 90% | 2946 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,387 psi | 79% | 2913 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2910 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,320 psi | 90% | 2910 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,320 psi | 90% | 2910 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,001 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,653 psi | 89% | 2900 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,782 psi | 87% | 2920 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,247 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,508 psi | 90% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,027 psi | 85% | 2913 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 2969 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,159 psi | 88% | 2877 fps | 97.8% |
| Bofors RP15 | <<locked>> | 92% | 55,956 psi | 86% | 2907 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 58,378 psi | 90% | 2959 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,782 psi | 87% | 2920 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 58,262 psi | 90% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,405 psi | 87% | 2913 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,392 psi | 90% | 2904 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,651 psi | 86% | 2858 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,508 psi | 90% | 2900 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,189 psi | 90% | 2825 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,450 psi | 88% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,405 psi | 58% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,869 psi | 88% | 2838 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,363 psi | 88% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,202 psi | 86% | 2841 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 58,479 psi | 90% | 2963 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,646 psi | 75% | 2822 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 56,898 psi | 88% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,448 psi | 85% | 2818 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,218 psi | 90% | 2848 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,175 psi | 90% | 2894 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,327 psi | 76% | 2848 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,855 psi | 88% | 2936 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,274 psi | 85% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,593 psi | 86% | 2920 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,030 psi | 89% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,421 psi | 90% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 59% | 1896 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,305 psi | 88% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,753 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,302 psi | 84% | 2959 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,218 psi | 90% | 2986 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 58,711 psi | 90% | 2881 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,217 psi | 88% | 2890 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 58,262 psi | 90% | 2851 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,898 psi | 88% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,448 psi | 85% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,028 psi | 86% | 2772 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,811 psi | 87% | 2887 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,536 psi | 87% | 2815 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 56,550 psi | 87% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,798 psi | 89% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,739 psi | 87% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,566 psi | 89% | 2844 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,739 psi | 87% | 2854 fps | 96% |
| Vihtavuori N550 | <<locked>> | 82% | 56,101 psi | 86% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,478 psi | 87% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,376 psi | 87% | 2936 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 56,985 psi | 88% | 2920 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 58,566 psi | 90% | 2982 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 55,564 psi | 86% | 2979 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,434 psi | 87% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,595 psi | 90% | 2904 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,044 psi | 89% | 2963 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,769 psi | 89% | 2861 fps | 99.9% |
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% | 40,248 psi | 62% | 2562 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,229 psi | 82% | 2799 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,669 psi | 64% | 2671 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 44,222 psi | 68% | 2687 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,566 psi | 61% | 2621 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 36,201 psi | 56% | 2536 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 47,718 psi | 73% | 2841 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 30,806 psi | 47% | 2441 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,628 psi | 69% | 2687 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,628 psi | 69% | 2687 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,879 psi | 78% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,208 psi | 68% | 2680 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,161 psi | 62% | 2628 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,972 psi | 60% | 2585 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,605 psi | 52% | 2510 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,888 psi | 68% | 2736 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,501 psi | 75% | 2838 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,282 psi | 73% | 2713 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,420 psi | 58% | 2569 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 35,882 psi | 55% | 2552 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 40,161 psi | 62% | 2628 fps | 97.6% |
| Bofors RP7 | <<locked>> | 80% | 54,534 psi | 84% | 2795 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,403 psi | 53% | 2497 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 54,665 psi | 84% | 2851 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,177 psi | 65% | 2625 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,408 psi | 64% | 2608 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,906 psi | 74% | 2684 fps | 100% |
| Hodgdon Retumbo | 75.7 gr | 80% | 32,764 psi | 50% | 2533 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 43% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,937 psi | 77% | 2733 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,227 psi | 77% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,482 psi | 67% | 2621 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 80% | 38,232 psi | 59% | 2598 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,767 psi | 57% | 2589 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 53,519 psi | 82% | 2769 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,967 psi | 80% | 2766 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,592 psi | 53% | 2441 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 50,705 psi | 78% | 2782 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,242 psi | 50% | 2497 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,598 psi | 66% | 2700 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 51,692 psi | 80% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,072 psi | 59% | 2605 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 50,734 psi | 78% | 2785 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,258 psi | 53% | 2490 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,388 psi | 82% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,822 psi | 80% | 2838 fps | 100% |
| ReloadSwiss RS 76 | 81 gr | 80% | 32,010 psi | 49% | 2503 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,450 psi | 61% | 2654 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 45,310 psi | 70% | 2664 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 43,642 psi | 67% | 2667 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 54,534 psi | 84% | 2795 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,519 psi | 82% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,967 psi | 80% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,460 psi | 81% | 2720 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,308 psi | 67% | 2664 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 46,209 psi | 71% | 2648 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 49,240 psi | 76% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,193 psi | 68% | 2648 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 53,098 psi | 82% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,493 psi | 59% | 2523 fps | 97.6% |
| Vihtavuori N170 | <<locked>> | 94% | 52,924 psi | 81% | 2795 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,562 psi | 81% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,308 psi | 67% | 2657 fps | 100% |
| Vihtavuori N560 | 78.6 gr | 80% | 42,424 psi | 65% | 2690 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 37,637 psi | 58% | 2569 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 43,787 psi | 67% | 2733 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 94% | 47,819 psi | 74% | 2844 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,504 psi | 81% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,868 psi | 84% | 2854 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,361 psi | 56% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,611 psi | 63% | 2575 fps | 97.7% |
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 | 180gr | Sierra HP MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,028 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 58–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Sierra HP MatchKing 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.