Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 206gr | Peregrine VRG-2 bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 55,724 psi | 86% | 2661 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,027 psi | 85% | 2766 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 57,334 psi | 88% | 2749 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,854 psi | 86% | 2762 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 58,378 psi | 90% | 2792 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2848 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,232 psi | 88% | 2812 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,566 psi | 89% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,797 psi | 87% | 2736 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,173 psi | 86% | 2759 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,856 psi | 89% | 2717 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,465 psi | 90% | 2785 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,578 psi | 84% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,478 psi | 87% | 2825 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,648 psi | 79% | 2746 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,579 psi | 87% | 2726 fps | 98.7% |
| Bofors RP15 | <<locked>> | 90% | 55,376 psi | 85% | 2743 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,073 psi | 89% | 2802 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 56,173 psi | 86% | 2759 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,057 psi | 86% | 2759 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 58,755 psi | 90% | 2753 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,696 psi | 89% | 2740 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,566 psi | 89% | 2657 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,551 psi | 89% | 2871 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,550 psi | 58% | 1739 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,811 psi | 86% | 2671 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,492 psi | 87% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,332 psi | 85% | 2680 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 58,102 psi | 89% | 2802 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 57,580 psi | 89% | 2680 fps | 95.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2736 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 57,870 psi | 89% | 2697 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,421 psi | 88% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,145 psi | 88% | 2726 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2756 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,231 psi | 87% | 2772 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,986 psi | 89% | 2710 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,216 psi | 85% | 2766 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 57,087 psi | 88% | 2723 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,928 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 59% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,668 psi | 90% | 2858 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,856 psi | 89% | 2831 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 57,812 psi | 89% | 2720 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,478 psi | 87% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,870 psi | 89% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 58,378 psi | 90% | 2651 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,086 psi | 86% | 2723 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,637 psi | 86% | 2661 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 55,709 psi | 86% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,797 psi | 87% | 2700 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,797 psi | 87% | 2684 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,941 psi | 86% | 2707 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 86% | 55,912 psi | 86% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,709 psi | 86% | 2776 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 56,478 psi | 87% | 2766 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 58,233 psi | 90% | 2831 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 96% | 55,361 psi | 85% | 2831 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 58,102 psi | 89% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,739 psi | 87% | 2697 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% | 42,264 psi | 65% | 2461 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,237 psi | 68% | 2585 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 46,731 psi | 72% | 2589 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 41,916 psi | 65% | 2536 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 33,228 psi | 51% | 2343 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 43,772 psi | 67% | 2641 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 28,311 psi | 44% | 2254 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,867 psi | 83% | 2684 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,601 psi | 72% | 2582 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,583 psi | 66% | 2536 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,321 psi | 64% | 2480 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,650 psi | 55% | 2425 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,789 psi | 72% | 2635 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 41,466 psi | 64% | 2572 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 44,208 psi | 68% | 2615 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,526 psi | 67% | 2510 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 39,552 psi | 61% | 2477 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 33,069 psi | 51% | 2356 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,583 psi | 66% | 2536 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 33,721 psi | 52% | 2359 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 44,556 psi | 69% | 2533 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,729 psi | 67% | 2520 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,430 psi | 78% | 2566 fps | 100% |
| Hodgdon Retumbo | 74.3 gr | 80% | 34,780 psi | 54% | 2461 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 43% | 1558 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,373 psi | 81% | 2625 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,765 psi | 81% | 2625 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,585 psi | 70% | 2526 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 40,611 psi | 63% | 2516 fps | 97.8% |
| IMR 7977 Enduron | <<locked>> | 92% | 53,983 psi | 83% | 2628 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,142 psi | 53% | 2402 fps | 96% |
| Lovex S070 | <<locked>> | 80% | 54,331 psi | 84% | 2651 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,289 psi | 56% | 2349 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 53,359 psi | 82% | 2674 fps | 100% |
| Norma 217 | <<locked>> | 82% | 27,731 psi | 43% | 2251 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 45,252 psi | 70% | 2602 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 54,375 psi | 84% | 2664 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,727 psi | 63% | 2530 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 53,374 psi | 82% | 2671 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,463 psi | 56% | 2411 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,906 psi | 44% | 1598 fps | 100% |
| ReloadSwiss RS 76 | 79.5 gr | 80% | 33,968 psi | 52% | 2431 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 36,187 psi | 56% | 2454 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 47,601 psi | 73% | 2566 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,079 psi | 71% | 2572 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 54,331 psi | 84% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,781 psi | 84% | 2605 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,730 psi | 70% | 2566 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 48,457 psi | 75% | 2552 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 52,098 psi | 80% | 2618 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,499 psi | 72% | 2546 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 40,596 psi | 62% | 2434 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 48,791 psi | 75% | 2595 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 45,818 psi | 71% | 2552 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,991 psi | 69% | 2602 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 37,057 psi | 57% | 2425 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 37,463 psi | 58% | 2470 fps | 95.1% |
| Vihtavuori N570 | 86.8 gr | 90% | 44,498 psi | 68% | 2644 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,450 psi | 61% | 2533 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,888 psi | 66% | 2484 fps | 99.1% |
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 | 206gr | Peregrine VRG-2. Hodgdon Retumbo delivers the highest muzzle velocity at 2,871 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,871 fps. Accurate 8700 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 206.0 gr projectile in 0.308" calls for a 1:12.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 206gr | Peregrine VRG-2 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Hodgdon US 869, 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.