Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | Lapua D46 bullet and 67 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 80 and Vihtavuori N570.
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% | 57,769 psi | 89% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,160 psi | 90% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,826 psi | 87% | 2910 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 55,259 psi | 85% | 2841 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 57,392 psi | 88% | 2907 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 55,854 psi | 86% | 2877 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 2913 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,418 psi | 84% | 2897 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,622 psi | 86% | 2841 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,434 psi | 85% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,552 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,769 psi | 89% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,796 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,825 psi | 86% | 2881 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,391 psi | 87% | 2897 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,131 psi | 89% | 2966 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,189 psi | 90% | 2867 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 57,145 psi | 88% | 2890 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,767 psi | 86% | 2894 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 57,769 psi | 89% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,682 psi | 89% | 2904 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,753 psi | 87% | 2844 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,535 psi | 85% | 2828 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,622 psi | 86% | 2759 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,839 psi | 84% | 2963 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 58% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,609 psi | 89% | 2818 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,436 psi | 90% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,174 psi | 88% | 2825 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 55,709 psi | 86% | 2890 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,879 psi | 77% | 2818 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 57,841 psi | 89% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,405 psi | 87% | 2802 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,738 psi | 86% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,274 psi | 85% | 2825 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 50,734 psi | 78% | 2838 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,914 psi | 89% | 2920 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,289 psi | 87% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,971 psi | 88% | 2913 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,201 psi | 85% | 2822 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,448 psi | 85% | 2841 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 59% | 1877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,450 psi | 90% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,971 psi | 88% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,724 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,187 psi | 85% | 2910 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 86% | 55,956 psi | 86% | 2812 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 58,363 psi | 90% | 2877 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,841 psi | 89% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,405 psi | 87% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,956 psi | 88% | 2756 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,943 psi | 89% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,522 psi | 89% | 2802 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 57,508 psi | 89% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,697 psi | 90% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,783 psi | 89% | 2805 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,653 psi | 90% | 2831 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,914 psi | 89% | 2844 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 57,116 psi | 88% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,624 psi | 89% | 2844 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,363 psi | 88% | 2920 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 58,276 psi | 90% | 2907 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 55,811 psi | 86% | 2913 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 98% | 57,014 psi | 88% | 2972 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,479 psi | 88% | 2753 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,347 psi | 85% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,824 psi | 84% | 2789 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% | 41,147 psi | 63% | 2552 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 54,259 psi | 84% | 2782 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,627 psi | 66% | 2664 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 80% | 45,121 psi | 69% | 2674 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,393 psi | 62% | 2612 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 37,014 psi | 57% | 2530 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 48,849 psi | 75% | 2844 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 82% | 29,472 psi | 45% | 2379 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,469 psi | 70% | 2674 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,721 psi | 80% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,049 psi | 69% | 2667 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,075 psi | 63% | 2621 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,842 psi | 61% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,389 psi | 53% | 2503 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,034 psi | 69% | 2726 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,209 psi | 71% | 2766 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,107 psi | 69% | 2644 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,232 psi | 59% | 2559 fps | 97.1% |
| Bofors RP30 | <<locked>> | 82% | 34,272 psi | 53% | 2490 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 41,075 psi | 63% | 2621 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 35,041 psi | 54% | 2487 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,033 psi | 66% | 2615 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,250 psi | 65% | 2598 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,849 psi | 75% | 2667 fps | 100% |
| Hodgdon Retumbo | 75.7 gr | 80% | 33,547 psi | 52% | 2530 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,792 psi | 78% | 2720 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 51,198 psi | 79% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,222 psi | 68% | 2612 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 39,102 psi | 60% | 2592 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,302 psi | 54% | 2526 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 54,404 psi | 84% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,881 psi | 81% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,375 psi | 54% | 2434 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 51,677 psi | 80% | 2766 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 30,879 psi | 48% | 2438 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 43,598 psi | 67% | 2690 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 52,678 psi | 81% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,986 psi | 60% | 2602 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 51,721 psi | 80% | 2769 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,128 psi | 54% | 2484 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 44% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,476 psi | 84% | 2802 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,939 psi | 81% | 2825 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,779 psi | 50% | 2500 fps | 97.3% |
| ReloadSwiss RS 80 | 89.9 gr | 88% | 40,582 psi | 62% | 2651 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 45,977 psi | 71% | 2648 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 44,556 psi | 69% | 2657 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,404 psi | 84% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,881 psi | 81% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,330 psi | 82% | 2703 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,222 psi | 68% | 2654 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 47,050 psi | 72% | 2638 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 50,285 psi | 77% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,092 psi | 69% | 2635 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 54,085 psi | 83% | 2753 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,305 psi | 60% | 2516 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 94% | 54,041 psi | 83% | 2789 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,345 psi | 82% | 2759 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,280 psi | 68% | 2644 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,366 psi | 67% | 2680 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 38,537 psi | 59% | 2562 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 88% | 41,713 psi | 64% | 2667 fps | 95.5% |
| Vihtavuori N570 | 92.3 gr | 94% | 49,110 psi | 76% | 2841 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,490 psi | 82% | 2703 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,521 psi | 58% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,466 psi | 64% | 2566 fps | 98.1% |
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 67 powders for .300 Rem. Ultra Mag. loaded with the .308 | 185gr | Lapua D46. Vihtavuori N570 delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,834 fps to 2,972 fps. ADI AR 2218 gives the best case fill at 100 %, and 67 of the 67 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 185.0 gr projectile in 0.308" calls for a 1:12.5 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 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 185gr | Lapua D46 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.