Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 167gr | Peregrine Plainsmaster (VLR-4) bullet and 75 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 Winchester StaBALL HD.
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>> | 94% | 58,276 psi | 90% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,114 psi | 85% | 2917 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,377 psi | 88% | 3035 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,550 psi | 87% | 2979 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 58,595 psi | 90% | 3041 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,736 psi | 81% | 2936 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,253 psi | 73% | 2894 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,608 psi | 87% | 2972 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,449 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,711 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,927 psi | 86% | 2963 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,610 psi | 90% | 3031 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,115 psi | 86% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,753 psi | 86% | 3005 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,869 psi | 88% | 3031 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,304 psi | 87% | 2940 fps | 96.8% |
| Bofors RP15 | <<locked>> | 96% | 57,522 psi | 89% | 3018 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 3005 fps | 99.4% |
| Bofors RP5 | <<locked>> | 94% | 58,610 psi | 90% | 3031 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,261 psi | 88% | 2923 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3028 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 56,985 psi | 88% | 2972 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,738 psi | 86% | 2933 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 58,189 psi | 90% | 2979 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,913 psi | 88% | 2956 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,724 psi | 87% | 2900 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,784 psi | 90% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,102 psi | 89% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 57% | 1906 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,608 psi | 86% | 2907 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,798 psi | 90% | 2946 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,593 psi | 86% | 2907 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,697 psi | 90% | 2959 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 56,362 psi | 87% | 3018 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,554 psi | 65% | 2792 fps | 96.7% |
| Lovex S065 | <<locked>> | 84% | 55,738 psi | 86% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,725 psi | 89% | 2936 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,666 psi | 86% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,797 psi | 87% | 2959 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 42,830 psi | 66% | 2818 fps | 98.8% |
| Norma MRP | <<locked>> | 92% | 58,740 psi | 90% | 3054 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,421 psi | 88% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,580 psi | 89% | 3038 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 56,405 psi | 87% | 2956 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,043 psi | 86% | 2966 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,840 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,492 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,204 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,869 psi | 86% | 3074 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 3022 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 82% | 58,552 psi | 90% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,508 psi | 89% | 2949 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,477 psi | 85% | 2953 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,261 psi | 88% | 2923 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,738 psi | 86% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,725 psi | 89% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,175 psi | 90% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,769 psi | 90% | 2894 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,056 psi | 85% | 2949 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 58,102 psi | 89% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,477 psi | 85% | 2877 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 58,436 psi | 90% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,057 psi | 86% | 2923 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,796 psi | 86% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,390 psi | 85% | 2894 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,753 psi | 86% | 2904 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,479 psi | 90% | 2949 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,899 psi | 89% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,392 psi | 90% | 3051 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 58,581 psi | 90% | 3028 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,825 psi | 86% | 3025 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,216 psi | 85% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,188 psi | 88% | 2976 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,766 psi | 84% | 3025 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,072 psi | 86% | 2920 fps | 99.6% |
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% | 35,534 psi | 55% | 2543 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 47,790 psi | 74% | 2805 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,151 psi | 71% | 2844 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 39,885 psi | 61% | 2680 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 41,075 psi | 63% | 2730 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 39,813 psi | 61% | 2690 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 33,388 psi | 51% | 2582 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,292 psi | 62% | 2680 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,948 psi | 71% | 2815 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,519 psi | 82% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,929 psi | 61% | 2674 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,708 psi | 55% | 2608 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,316 psi | 53% | 2575 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,704 psi | 46% | 2477 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,305 psi | 59% | 2717 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,501 psi | 76% | 2822 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 38,218 psi | 59% | 2667 fps | 95.9% |
| Bofors RP30 | <<locked>> | 90% | 38,783 psi | 60% | 2700 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 35,708 psi | 55% | 2608 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 50,314 psi | 77% | 2815 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,869 psi | 58% | 2651 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 49,603 psi | 76% | 2854 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,083 psi | 80% | 2874 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 43,932 psi | 68% | 2736 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,105 psi | 66% | 2720 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,178 psi | 66% | 2694 fps | 100% |
| Hodgdon Retumbo | 79.8 gr | 86% | 35,781 psi | 55% | 2687 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,850 psi | 77% | 2881 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1713 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,716 psi | 70% | 2743 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,648 psi | 79% | 2838 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,368 psi | 70% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,467 psi | 65% | 2677 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 42,322 psi | 65% | 2769 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,639 psi | 61% | 2733 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 49,066 psi | 76% | 2785 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,442 psi | 73% | 2776 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,356 psi | 47% | 2415 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 46,006 psi | 71% | 2779 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,418 psi | 53% | 2628 fps | 96% |
| Norma MRP | <<locked>> | 80% | 37,565 psi | 58% | 2677 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 46,862 psi | 72% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,175 psi | 60% | 2707 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 45,876 psi | 71% | 2789 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,983 psi | 54% | 2582 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 44% | 1752 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,196 psi | 74% | 2828 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,441 psi | 71% | 2844 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 84% | 32,605 psi | 50% | 2589 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 43,265 psi | 67% | 2812 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 54,810 psi | 84% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,205 psi | 63% | 2661 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,291 psi | 60% | 2661 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,314 psi | 77% | 2815 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,066 psi | 76% | 2785 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,442 psi | 73% | 2776 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,520 psi | 84% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,124 psi | 74% | 2733 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,957 psi | 60% | 2654 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 54,476 psi | 84% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,003 psi | 65% | 2644 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 44,019 psi | 68% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,711 psi | 61% | 2638 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 52,243 psi | 80% | 2782 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,356 psi | 74% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,389 psi | 53% | 2510 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 47,703 psi | 73% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,479 psi | 59% | 2651 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,743 psi | 67% | 2795 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 40,988 psi | 63% | 2720 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 44,527 psi | 69% | 2831 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,776 psi | 74% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,792 psi | 77% | 2861 fps | 99.6% |
| Winchester StaBALL HD | 76.2 gr | 80% | 30,647 psi | 47% | 2589 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,390 psi | 56% | 2562 fps | 95.3% |
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 75 powders for .300 Rem. Ultra Mag. loaded with the .308 | 167gr | Peregrine Plainsmaster (VLR-4). Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,140 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 167.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 167gr | 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.