Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Woodleigh HS bullet and 70 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% | 56,666 psi | 87% | 2825 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,884 psi | 88% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,463 psi | 85% | 2920 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 57,914 psi | 89% | 2910 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 56,260 psi | 87% | 2920 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 2946 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,329 psi | 79% | 2913 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,073 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,537 psi | 89% | 2900 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,666 psi | 87% | 2913 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,305 psi | 90% | 2881 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,378 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,143 psi | 85% | 2913 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 2969 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,217 psi | 88% | 2877 fps | 97.8% |
| Bofors RP15 | <<locked>> | 92% | 55,840 psi | 86% | 2904 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 58,262 psi | 90% | 2959 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,666 psi | 87% | 2913 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 58,131 psi | 89% | 2848 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,260 psi | 87% | 2910 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,450 psi | 90% | 2904 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,521 psi | 85% | 2854 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,421 psi | 90% | 2897 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,291 psi | 90% | 2825 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,305 psi | 88% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 58% | 1854 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,724 psi | 87% | 2835 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,261 psi | 88% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,101 psi | 86% | 2838 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 58,334 psi | 90% | 2956 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,501 psi | 75% | 2822 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 56,985 psi | 88% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,347 psi | 85% | 2815 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,117 psi | 89% | 2844 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,088 psi | 89% | 2890 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2844 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,768 psi | 87% | 2933 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,129 psi | 85% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,448 psi | 85% | 2920 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 57,928 psi | 89% | 2887 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,334 psi | 90% | 2907 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,334 psi | 59% | 1896 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,203 psi | 88% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,840 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,697 psi | 90% | 3018 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,088 psi | 89% | 2979 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 58,624 psi | 90% | 2881 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 57,305 psi | 88% | 2894 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 58,131 psi | 89% | 2848 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,985 psi | 88% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,347 psi | 85% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,912 psi | 86% | 2769 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,898 psi | 88% | 2887 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,594 psi | 87% | 2815 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 56,391 psi | 87% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,696 psi | 89% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,623 psi | 87% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,421 psi | 88% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,666 psi | 87% | 2851 fps | 96% |
| Vihtavuori N550 | <<locked>> | 82% | 55,970 psi | 86% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,550 psi | 87% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,231 psi | 87% | 2933 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 56,898 psi | 88% | 2917 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 58,494 psi | 90% | 2979 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 55,448 psi | 85% | 2976 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,304 psi | 87% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,450 psi | 90% | 2904 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,088 psi | 89% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,653 psi | 89% | 2858 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% | 40,306 psi | 62% | 2562 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,287 psi | 82% | 2799 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,582 psi | 64% | 2671 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 44,106 psi | 68% | 2684 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,610 psi | 61% | 2621 fps | 96% |
| ADI AR 2217 | <<locked>> | 86% | 36,114 psi | 56% | 2533 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 98% | 47,659 psi | 73% | 2838 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 84% | 30,835 psi | 47% | 2441 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,778 psi | 78% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,251 psi | 68% | 2680 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,205 psi | 62% | 2628 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,856 psi | 60% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,504 psi | 52% | 2503 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,787 psi | 67% | 2733 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,573 psi | 75% | 2838 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,181 psi | 73% | 2707 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,318 psi | 57% | 2566 fps | 96.5% |
| Bofors RP30 | <<locked>> | 84% | 35,795 psi | 55% | 2549 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 40,205 psi | 62% | 2628 fps | 97.6% |
| Bofors RP7 | <<locked>> | 80% | 54,636 psi | 84% | 2799 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 36,811 psi | 57% | 2552 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 54,563 psi | 84% | 2848 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,235 psi | 65% | 2625 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,466 psi | 64% | 2608 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,805 psi | 74% | 2680 fps | 100% |
| Hodgdon Retumbo | 75.7 gr | 80% | 32,808 psi | 50% | 2530 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 43% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,806 psi | 77% | 2730 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 50,270 psi | 77% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,366 psi | 67% | 2621 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 38,276 psi | 59% | 2598 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,811 psi | 57% | 2589 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 53,417 psi | 82% | 2766 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,851 psi | 80% | 2762 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,635 psi | 53% | 2441 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 50,604 psi | 78% | 2779 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,169 psi | 50% | 2493 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,511 psi | 65% | 2697 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 51,561 psi | 79% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,116 psi | 59% | 2605 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 50,618 psi | 78% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,156 psi | 53% | 2487 fps | 96.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,689 psi | 44% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,490 psi | 82% | 2818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,880 psi | 80% | 2841 fps | 100% |
| ReloadSwiss RS 76 | 81 gr | 80% | 32,053 psi | 49% | 2503 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,378 psi | 61% | 2651 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 45,223 psi | 70% | 2661 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 80% | 43,714 psi | 67% | 2667 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 54,636 psi | 84% | 2799 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,417 psi | 82% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,851 psi | 80% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,344 psi | 81% | 2717 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,366 psi | 67% | 2664 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 46,253 psi | 71% | 2648 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 49,139 psi | 76% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,237 psi | 68% | 2648 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 53,156 psi | 82% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,551 psi | 59% | 2526 fps | 97.6% |
| Vihtavuori N170 | <<locked>> | 94% | 53,011 psi | 82% | 2792 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,475 psi | 81% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,352 psi | 67% | 2657 fps | 100% |
| Vihtavuori N560 | 78.5 gr | 80% | 42,337 psi | 65% | 2687 fps | 96.4% |
| Vihtavuori N565 | <<locked>> | 82% | 37,550 psi | 58% | 2566 fps | 95% |
| Vihtavuori N568 | <<locked>> | 90% | 43,685 psi | 67% | 2733 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 94% | 47,906 psi | 74% | 2848 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,576 psi | 81% | 2723 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,708 psi | 84% | 2848 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,274 psi | 56% | 2621 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,654 psi | 63% | 2575 fps | 97.6% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Woodleigh HS. 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. Accurate 8700 gives the best case fill at 100 %, and 76 of the 76 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 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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 | Woodleigh HS 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.