Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Peregrine VRG-3 bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and ReloadSwiss RS 76.
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% | 58,276 psi | 90% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,624 psi | 90% | 2746 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,580 psi | 89% | 2835 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 56,144 psi | 86% | 2766 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 58,421 psi | 90% | 2835 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,913 psi | 88% | 2805 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,447 psi | 82% | 2851 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,651 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,362 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,651 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,639 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,536 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,985 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,421 psi | 88% | 2818 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,868 psi | 84% | 2835 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,067 psi | 77% | 2749 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,477 psi | 85% | 2743 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 57,986 psi | 89% | 2815 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,623 psi | 87% | 2818 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 58,639 psi | 90% | 2825 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 58,624 psi | 90% | 2828 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,551 psi | 89% | 2769 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,507 psi | 87% | 2756 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,405 psi | 87% | 2677 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,956 psi | 86% | 2884 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,478 psi | 58% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,537 psi | 90% | 2740 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,361 psi | 85% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,827 psi | 89% | 2749 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,724 psi | 87% | 2815 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,734 psi | 78% | 2746 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 58,407 psi | 90% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,811 psi | 87% | 2717 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,159 psi | 86% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,014 psi | 86% | 2746 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 2769 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,882 psi | 84% | 2785 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,840 psi | 87% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,015 psi | 89% | 2838 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,941 psi | 86% | 2740 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,434 psi | 87% | 2766 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 59% | 1804 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,015 psi | 89% | 2802 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,913 psi | 88% | 2874 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,231 psi | 87% | 2841 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 56,710 psi | 87% | 2736 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,274 psi | 85% | 2746 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,407 psi | 90% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,811 psi | 87% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,377 psi | 88% | 2674 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 54,882 psi | 84% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,233 psi | 90% | 2726 fps | 99.7% |
| Somchem S365 | <<locked>> | 84% | 58,450 psi | 90% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,637 psi | 86% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,421 psi | 90% | 2720 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,593 psi | 86% | 2703 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,566 psi | 90% | 2776 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 82% | 57,711 psi | 89% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,349 psi | 90% | 2759 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,363 psi | 90% | 2848 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,114 psi | 85% | 2779 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 56,710 psi | 87% | 2844 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 58,131 psi | 89% | 2904 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,175 psi | 90% | 2671 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,420 psi | 87% | 2815 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,535 psi | 85% | 2713 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% | 41,278 psi | 64% | 2474 fps | 99.9% |
| Accurate 4350 | <<locked>> | 80% | 54,781 psi | 84% | 2700 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 43,134 psi | 66% | 2598 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 45,730 psi | 70% | 2605 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 40,930 psi | 63% | 2546 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 34,882 psi | 54% | 2411 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 46,006 psi | 71% | 2717 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 27,586 psi | 42% | 2257 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,707 psi | 81% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,629 psi | 70% | 2595 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,568 psi | 64% | 2552 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,292 psi | 62% | 2497 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,722 psi | 53% | 2434 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,513 psi | 70% | 2648 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,468 psi | 67% | 2641 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,311 psi | 71% | 2684 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,728 psi | 66% | 2523 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 38,595 psi | 59% | 2490 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 34,476 psi | 53% | 2418 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 41,568 psi | 64% | 2552 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 32,909 psi | 51% | 2365 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,598 psi | 67% | 2546 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,786 psi | 66% | 2533 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,385 psi | 76% | 2585 fps | 100% |
| Hodgdon Retumbo | 74.3 gr | 80% | 33,866 psi | 52% | 2467 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 43% | 1581 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,401 psi | 79% | 2641 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,692 psi | 80% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,715 psi | 69% | 2539 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 39,610 psi | 61% | 2526 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,141 psi | 51% | 2402 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 54,882 psi | 84% | 2667 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,330 psi | 82% | 2667 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,418 psi | 55% | 2359 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 52,286 psi | 80% | 2694 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 28,892 psi | 44% | 2313 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 44,121 psi | 68% | 2618 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,287 psi | 82% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,639 psi | 61% | 2536 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 52,272 psi | 80% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,433 psi | 55% | 2418 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 44% | 1617 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,838 psi | 83% | 2746 fps | 100% |
| ReloadSwiss RS 76 | 79.5 gr | 80% | 33,040 psi | 51% | 2438 fps | 98.2% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 37,971 psi | 58% | 2523 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 46,659 psi | 72% | 2582 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,063 psi | 69% | 2585 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,882 psi | 84% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,330 psi | 82% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,824 psi | 83% | 2625 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,715 psi | 69% | 2579 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 47,514 psi | 73% | 2566 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 50,923 psi | 78% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,498 psi | 70% | 2562 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 54,737 psi | 84% | 2674 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,682 psi | 61% | 2448 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 51,082 psi | 79% | 2661 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 53,998 psi | 83% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,744 psi | 69% | 2569 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,918 psi | 68% | 2612 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 36,100 psi | 56% | 2434 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 39,189 psi | 60% | 2536 fps | 95.4% |
| Vihtavuori N570 | 88.7 gr | 92% | 46,499 psi | 72% | 2713 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,215 psi | 83% | 2625 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,101 psi | 59% | 2543 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,945 psi | 65% | 2497 fps | 98.7% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Peregrine VRG-3. Vihtavuori N570 delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,904 fps. Accurate 8700 gives the best case fill at 100 %, and 73 of the 73 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 1:12.0 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Peregrine VRG-3 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, 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.