Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .31 | 200gr | Lapua D166 bullet and 56 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 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>> | 88% | 57,305 psi | 88% | 2713 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,231 psi | 87% | 2818 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 58,320 psi | 90% | 2799 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,956 psi | 88% | 2812 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 55,608 psi | 86% | 2789 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,246 psi | 87% | 2897 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,610 psi | 90% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,494 psi | 90% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,957 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,392 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,535 psi | 85% | 2720 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,825 psi | 86% | 2785 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,043 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,059 psi | 89% | 2881 fps | 98.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2802 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,508 psi | 89% | 2772 fps | 98.7% |
| Bofors RP15 | <<locked>> | 90% | 56,637 psi | 87% | 2795 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,550 psi | 85% | 2802 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,392 psi | 88% | 2808 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,261 psi | 88% | 2808 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,927 psi | 86% | 2749 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,769 psi | 90% | 2789 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,595 psi | 90% | 2703 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 54,824 psi | 84% | 2867 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 58% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,811 psi | 87% | 2720 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,609 psi | 89% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,188 psi | 86% | 2726 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 55,230 psi | 85% | 2795 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 94% | 58,668 psi | 90% | 2730 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,592 psi | 82% | 2789 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,303 psi | 85% | 2690 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,146 psi | 89% | 2776 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,752 psi | 84% | 2808 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,522 psi | 89% | 2822 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,478 psi | 87% | 2815 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,160 psi | 90% | 2769 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,955 psi | 85% | 2746 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 59% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,680 psi | 86% | 2854 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 55,056 psi | 85% | 2822 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 58,755 psi | 90% | 2766 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,812 psi | 89% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,421 psi | 88% | 2779 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,666 psi | 87% | 2707 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,072 psi | 88% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,131 psi | 89% | 2749 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,160 psi | 90% | 2736 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,377 psi | 88% | 2759 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 86% | 57,276 psi | 88% | 2746 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,884 psi | 88% | 2825 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 57,957 psi | 89% | 2818 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 55,550 psi | 85% | 2825 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,840 psi | 87% | 2884 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,622 psi | 86% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,073 psi | 89% | 2749 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% | 43,642 psi | 67% | 2513 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,440 psi | 70% | 2638 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 47,703 psi | 73% | 2635 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,062 psi | 66% | 2585 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 34,330 psi | 53% | 2395 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 94% | 45,020 psi | 69% | 2697 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 29,370 psi | 45% | 2310 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,882 psi | 84% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,572 psi | 73% | 2628 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,816 psi | 67% | 2592 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,496 psi | 65% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,753 psi | 57% | 2477 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,341 psi | 74% | 2690 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 42,801 psi | 66% | 2625 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,050 psi | 71% | 2677 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,295 psi | 68% | 2556 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 40,683 psi | 63% | 2530 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 34,258 psi | 53% | 2411 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,816 psi | 67% | 2592 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 34,853 psi | 54% | 2411 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,469 psi | 70% | 2582 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,831 psi | 69% | 2569 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,532 psi | 79% | 2615 fps | 100% |
| Hodgdon Retumbo | 75.7 gr | 80% | 35,882 psi | 55% | 2516 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 44% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,272 psi | 82% | 2671 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,911 psi | 83% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,456 psi | 71% | 2572 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 41,785 psi | 64% | 2569 fps | 98% |
| IMR 7977 Enduron | <<locked>> | 92% | 54,897 psi | 84% | 2674 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,098 psi | 51% | 2398 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 37,623 psi | 58% | 2402 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,418 psi | 84% | 2723 fps | 100% |
| Norma 217 | <<locked>> | 82% | 28,979 psi | 45% | 2310 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,485 psi | 72% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,930 psi | 65% | 2582 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 80% | 54,505 psi | 84% | 2720 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,695 psi | 58% | 2464 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 45% | 1627 fps | 100% |
| ReloadSwiss RS 76 | 81.1 gr | 80% | 35,288 psi | 54% | 2493 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,565 psi | 58% | 2510 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 48,501 psi | 75% | 2612 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,326 psi | 73% | 2621 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,978 psi | 72% | 2618 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,443 psi | 76% | 2598 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 53,287 psi | 82% | 2667 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,776 psi | 74% | 2598 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,626 psi | 64% | 2484 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 49,995 psi | 77% | 2644 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 47,195 psi | 73% | 2605 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,137 psi | 71% | 2651 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,435 psi | 59% | 2484 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 38,827 psi | 60% | 2530 fps | 95.4% |
| Vihtavuori N570 | 88.4 gr | 90% | 45,716 psi | 70% | 2697 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,886 psi | 63% | 2589 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,048 psi | 68% | 2536 fps | 99.2% |
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 63 powders for .300 Rem. Ultra Mag. loaded with the .31 | 200gr | Lapua D166. ADI AR 2218 delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,897 fps. Accurate 8700 gives the best case fill at 100 %, and 63 of the 63 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 200.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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 N570 rank at the top here: for .300 Rem. Ultra Mag. with the .31 | 200gr | Lapua D166 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Lovex D100, Ramshot LRT 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.