Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 197gr | Peregrine VLR-5 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% | 55,564 psi | 86% | 2710 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,014 psi | 86% | 2730 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,798 psi | 90% | 2867 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 88% | 57,493 psi | 88% | 2802 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,695 psi | 86% | 2812 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,030 psi | 89% | 2835 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,444 psi | 78% | 2808 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,228 psi | 80% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,595 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,898 psi | 88% | 2785 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,927 psi | 86% | 2805 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,522 psi | 89% | 2762 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,653 psi | 89% | 2831 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,421 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,463 psi | 85% | 2861 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,695 psi | 87% | 2772 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 55,129 psi | 85% | 2789 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,406 psi | 88% | 2844 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,927 psi | 86% | 2805 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,609 psi | 89% | 2736 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,550 psi | 85% | 2802 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,899 psi | 89% | 2789 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,042 psi | 85% | 2746 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,812 psi | 89% | 2789 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,595 psi | 89% | 2707 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,536 psi | 87% | 2913 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 57% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,173 psi | 86% | 2723 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,478 psi | 87% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,666 psi | 86% | 2730 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 57,914 psi | 89% | 2848 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,601 psi | 73% | 2713 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,391 psi | 87% | 2700 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,262 psi | 90% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,072 psi | 88% | 2730 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,566 psi | 89% | 2782 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,327 psi | 74% | 2736 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,854 psi | 86% | 2818 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,218 psi | 90% | 2766 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,824 psi | 84% | 2808 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 57,348 psi | 88% | 2776 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,406 psi | 88% | 2795 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 59% | 1804 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,579 psi | 87% | 2756 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,129 psi | 85% | 2779 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,711 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,014 psi | 88% | 2871 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 88% | 58,117 psi | 89% | 2769 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 56,492 psi | 87% | 2776 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,609 psi | 89% | 2736 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,391 psi | 87% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,262 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,303 psi | 85% | 2657 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,144 psi | 86% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,854 psi | 86% | 2707 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 55,651 psi | 86% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,942 psi | 88% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,043 psi | 86% | 2707 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,855 psi | 88% | 2733 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,782 psi | 86% | 2746 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 55,259 psi | 85% | 2710 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,666 psi | 86% | 2743 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,463 psi | 85% | 2818 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 56,057 psi | 86% | 2808 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 57,435 psi | 88% | 2867 fps | 99.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2927 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,695 psi | 86% | 2657 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,899 psi | 89% | 2789 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,174 psi | 88% | 2848 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,855 psi | 88% | 2743 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% | 39,334 psi | 61% | 2454 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 52,417 psi | 81% | 2680 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,857 psi | 63% | 2566 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 43,714 psi | 67% | 2582 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 38,928 psi | 60% | 2516 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 35,491 psi | 55% | 2438 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 46,818 psi | 72% | 2740 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 27,978 psi | 43% | 2280 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,328 psi | 77% | 2687 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,685 psi | 67% | 2575 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,436 psi | 61% | 2523 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,189 psi | 59% | 2477 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,924 psi | 51% | 2408 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,902 psi | 66% | 2625 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 43,961 psi | 68% | 2664 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 43,758 psi | 67% | 2552 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 36,709 psi | 56% | 2464 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 34,954 psi | 54% | 2448 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 39,436 psi | 61% | 2523 fps | 98% |
| Bofors RP7 | <<locked>> | 80% | 53,940 psi | 83% | 2680 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 33,692 psi | 52% | 2395 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 53,969 psi | 83% | 2733 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,582 psi | 64% | 2523 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,785 psi | 63% | 2507 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,166 psi | 73% | 2569 fps | 100% |
| Hodgdon Retumbo | 71.9 gr | 80% | 32,010 psi | 49% | 2428 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 43% | 1578 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,472 psi | 76% | 2625 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,530 psi | 76% | 2628 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,960 psi | 66% | 2520 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 37,695 psi | 58% | 2500 fps | 96.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,868 psi | 55% | 2484 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 52,852 psi | 81% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,314 psi | 79% | 2651 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,678 psi | 52% | 2336 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 50,082 psi | 77% | 2671 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 29,182 psi | 45% | 2336 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 41,858 psi | 64% | 2592 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 51,053 psi | 79% | 2667 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,333 psi | 57% | 2500 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 50,053 psi | 77% | 2671 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,344 psi | 51% | 2385 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,689 psi | 44% | 1617 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,692 psi | 81% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,198 psi | 79% | 2726 fps | 100% |
| ReloadSwiss RS 76 | 77 gr | 80% | 31,198 psi | 48% | 2402 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 38,406 psi | 59% | 2549 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,599 psi | 69% | 2556 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 43,018 psi | 66% | 2562 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 80% | 53,940 psi | 83% | 2680 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,852 psi | 81% | 2654 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,314 psi | 79% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,750 psi | 80% | 2608 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,685 psi | 66% | 2556 fps | 98.7% |
| Somchem S361 | <<locked>> | 80% | 45,527 psi | 70% | 2543 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 48,573 psi | 75% | 2621 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,410 psi | 67% | 2539 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 52,591 psi | 81% | 2661 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,884 psi | 58% | 2425 fps | 98% |
| Vihtavuori N170 | <<locked>> | 94% | 51,953 psi | 80% | 2687 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 51,764 psi | 80% | 2661 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,540 psi | 65% | 2546 fps | 100% |
| Vihtavuori N560 | 74.7 gr | 80% | 41,756 psi | 64% | 2585 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 36,637 psi | 56% | 2461 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 39,813 psi | 61% | 2569 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 46,891 psi | 72% | 2736 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,967 psi | 80% | 2612 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,172 psi | 83% | 2736 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,491 psi | 55% | 2516 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,972 psi | 62% | 2474 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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 197gr | Peregrine VLR-5. Vihtavuori N570 delivers the highest muzzle velocity at 2,927 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,927 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 57–90 %, leaving at least 10 % headroom. The 197.0 gr projectile in 0.308" calls for a 1:10.0 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 | 197gr | Peregrine VLR-5 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Shooters World 50 BMG 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.