Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 183gr | Peregrine Plainsmaster (VLR-4) bullet and 74 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 Accurate MAGPRO.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 92% | 57,029 psi | 88% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,827 psi | 89% | 2841 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,086 psi | 86% | 2913 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 55,274 psi | 85% | 2854 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 57,159 psi | 88% | 2917 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,434 psi | 85% | 2881 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,850 psi | 77% | 2841 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,419 psi | 85% | 2848 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,274 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,494 psi | 90% | 2897 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,290 psi | 88% | 2910 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,027 psi | 85% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,027 psi | 85% | 2887 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,709 psi | 86% | 2907 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,591 psi | 81% | 2894 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,421 psi | 90% | 2877 fps | 98% |
| Bofors RP15 | <<locked>> | 94% | 56,463 psi | 87% | 2897 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,711 psi | 90% | 2946 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 57,290 psi | 88% | 2910 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,738 psi | 86% | 2795 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,072 psi | 88% | 2907 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,622 psi | 86% | 2844 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,044 psi | 89% | 2861 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,608 psi | 87% | 2854 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,550 psi | 85% | 2838 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,303 psi | 85% | 2769 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,711 psi | 89% | 3018 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,478 psi | 87% | 2877 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1824 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,986 psi | 89% | 2835 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,261 psi | 88% | 2815 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,189 psi | 90% | 2835 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,348 psi | 88% | 2838 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 55,259 psi | 85% | 2897 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,136 psi | 69% | 2749 fps | 98.2% |
| Lovex S065 | <<locked>> | 84% | 57,914 psi | 89% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,188 psi | 86% | 2808 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,334 psi | 90% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,477 psi | 85% | 2835 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 45,643 psi | 70% | 2772 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 57,334 psi | 88% | 2927 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,985 psi | 86% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,231 psi | 87% | 2913 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 55,216 psi | 85% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,636 psi | 84% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 59% | 1867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,146 psi | 89% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,782 psi | 87% | 2894 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,824 psi | 84% | 2953 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2969 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 56,115 psi | 86% | 2825 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 58,117 psi | 89% | 2884 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 55,738 psi | 86% | 2795 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,914 psi | 89% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,188 psi | 86% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,072 psi | 88% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,696 psi | 89% | 2884 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,769 psi | 89% | 2812 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 57,246 psi | 88% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,494 psi | 90% | 2854 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,160 psi | 90% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,841 psi | 89% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,334 psi | 90% | 2835 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 57,406 psi | 88% | 2844 fps | 96% |
| Vihtavuori N550 | <<locked>> | 84% | 56,942 psi | 88% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,884 psi | 88% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,956 psi | 88% | 2927 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 57,377 psi | 88% | 2907 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 54,723 psi | 84% | 2910 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,738 psi | 86% | 2966 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,696 psi | 89% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,840 psi | 86% | 2848 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,305 psi | 90% | 2956 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,682 psi | 90% | 2854 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% | 37,420 psi | 58% | 2490 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 50,111 psi | 77% | 2736 fps | 100% |
| Accurate MAGPRO | 78.9 gr | 82% | 41,814 psi | 64% | 2661 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 41,930 psi | 65% | 2628 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 37,275 psi | 57% | 2552 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 88% | 36,289 psi | 56% | 2523 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 86% | 30,647 psi | 47% | 2425 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,192 psi | 65% | 2625 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,327 psi | 74% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,771 psi | 64% | 2618 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,637 psi | 58% | 2562 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,376 psi | 56% | 2523 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,386 psi | 48% | 2438 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,712 psi | 63% | 2667 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,733 psi | 75% | 2825 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,080 psi | 74% | 2707 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 35,027 psi | 54% | 2500 fps | 95.6% |
| Bofors RP30 | <<locked>> | 86% | 35,708 psi | 55% | 2536 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 37,637 psi | 58% | 2562 fps | 96.8% |
| Bofors RP7 | <<locked>> | 80% | 52,170 psi | 80% | 2740 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 84% | 34,490 psi | 53% | 2484 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 51,866 psi | 80% | 2789 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 54,201 psi | 83% | 2805 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,871 psi | 61% | 2562 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,102 psi | 60% | 2546 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,324 psi | 70% | 2628 fps | 100% |
| Hodgdon Retumbo | 74.7 gr | 82% | 32,837 psi | 51% | 2520 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 52,359 psi | 81% | 2818 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 43% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,732 psi | 73% | 2677 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,708 psi | 83% | 2766 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,630 psi | 73% | 2684 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,437 psi | 64% | 2566 fps | 96.1% |
| IMR 7828 SSC | <<locked>> | 82% | 38,653 psi | 59% | 2595 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,506 psi | 56% | 2569 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 51,097 psi | 79% | 2713 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,516 psi | 76% | 2707 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,053 psi | 49% | 2369 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 48,138 psi | 74% | 2720 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 31,792 psi | 49% | 2474 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 39,813 psi | 61% | 2631 fps | 98.6% |
| Norma URP | <<locked>> | 80% | 49,124 psi | 76% | 2726 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,305 psi | 59% | 2595 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,066 psi | 74% | 2723 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,792 psi | 49% | 2418 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,473 psi | 78% | 2756 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,994 psi | 75% | 2782 fps | 100% |
| ReloadSwiss RS 76 | 78 gr | 80% | 29,704 psi | 46% | 2421 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,554 psi | 65% | 2707 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 42,960 psi | 66% | 2605 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 80% | 41,220 psi | 63% | 2605 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 80% | 52,170 psi | 80% | 2740 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,097 psi | 79% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,516 psi | 76% | 2707 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,995 psi | 77% | 2664 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,886 psi | 63% | 2602 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 43,932 psi | 68% | 2592 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 46,470 psi | 72% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,640 psi | 64% | 2582 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 80% | 54,447 psi | 84% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,444 psi | 78% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,114 psi | 56% | 2461 fps | 96.8% |
| Vihtavuori N170 | <<locked>> | 96% | 53,490 psi | 82% | 2785 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,821 psi | 77% | 2720 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,480 psi | 62% | 2592 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,784 psi | 61% | 2621 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 84% | 37,478 psi | 58% | 2552 fps | 95% |
| Vihtavuori N568 | <<locked>> | 92% | 43,787 psi | 67% | 2720 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 96% | 47,935 psi | 74% | 2831 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,082 psi | 77% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,069 psi | 80% | 2792 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,141 psi | 51% | 2549 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,247 psi | 59% | 2513 fps | 96.9% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 183gr | Peregrine Plainsmaster (VLR-4). Hodgdon Retumbo delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,018 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 183.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 76, Accurate MAGPRO rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 183gr | Peregrine Plainsmaster (VLR-4) 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.