Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | Peregrine Bushmaster (VRG-3) bullet and 73 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>> | 92% | 56,347 psi | 87% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,043 psi | 88% | 2959 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 58,552 psi | 90% | 3081 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 90% | 55,419 psi | 85% | 3018 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 58,320 psi | 90% | 3018 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,536 psi | 87% | 3025 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,694 psi | 84% | 2982 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,211 psi | 76% | 2943 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 58,537 psi | 90% | 3018 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,189 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,812 psi | 89% | 3005 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,724 psi | 87% | 3018 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,146 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,334 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,853 psi | 84% | 3012 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,798 psi | 89% | 2979 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 55,854 psi | 86% | 3005 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3054 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,724 psi | 87% | 3018 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 58,755 psi | 90% | 2963 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,478 psi | 87% | 3015 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 54,897 psi | 84% | 2956 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,246 psi | 88% | 2972 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 55,999 psi | 86% | 2963 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,998 psi | 85% | 2946 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,523 psi | 90% | 2936 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,101 psi | 88% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,854 psi | 86% | 2989 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 57% | 1929 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,145 psi | 88% | 2946 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,492 psi | 87% | 2930 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,537 psi | 89% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,594 psi | 87% | 2943 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 58,508 psi | 90% | 3061 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,498 psi | 68% | 2841 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 57,246 psi | 88% | 2927 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,622 psi | 86% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,798 psi | 89% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,769 psi | 90% | 3005 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,889 psi | 69% | 2864 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 56,811 psi | 87% | 3038 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,376 psi | 85% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,463 psi | 85% | 3022 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 58,378 psi | 90% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,392 psi | 90% | 3009 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 58% | 1975 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,392 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,072 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,581 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 3074 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,376 psi | 85% | 2933 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 57,479 psi | 88% | 2999 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,755 psi | 90% | 2963 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,246 psi | 88% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,622 psi | 86% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,420 psi | 87% | 2881 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,043 psi | 88% | 2992 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 57,203 psi | 88% | 2920 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 56,275 psi | 87% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,899 psi | 89% | 2966 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,363 psi | 88% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,116 psi | 88% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,667 psi | 89% | 2946 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,289 psi | 87% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,086 psi | 86% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,449 psi | 87% | 3035 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 56,840 psi | 87% | 3015 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 3077 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,042 psi | 85% | 3064 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,000 psi | 88% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,100 psi | 85% | 2959 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,493 psi | 88% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,001 psi | 89% | 2959 fps | 99.8% |
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% | 36,811 psi | 57% | 2582 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 49,371 psi | 76% | 2844 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 40,582 psi | 62% | 2756 fps | 95.6% |
| Accurate MAGPRO | <<locked>> | 84% | 44,411 psi | 68% | 2818 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 41,176 psi | 63% | 2720 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 82% | 39,465 psi | 61% | 2707 fps | 95% |
| ADI AR 2217 | <<locked>> | 90% | 38,464 psi | 59% | 2674 fps | 95% |
| ADI AR 2225 | <<locked>> | 88% | 32,416 psi | 50% | 2566 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,568 psi | 64% | 2723 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,398 psi | 73% | 2854 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,176 psi | 63% | 2713 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,086 psi | 57% | 2651 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,694 psi | 55% | 2615 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,763 psi | 47% | 2516 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,987 psi | 62% | 2759 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,850 psi | 78% | 2864 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 36,912 psi | 57% | 2644 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 37,724 psi | 58% | 2684 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,086 psi | 57% | 2651 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 51,517 psi | 79% | 2851 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 39,233 psi | 60% | 2694 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 51,169 psi | 79% | 2897 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,606 psi | 83% | 2917 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,163 psi | 65% | 2717 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,408 psi | 64% | 2700 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,672 psi | 69% | 2736 fps | 100% |
| Hodgdon Retumbo | 80.8 gr | 84% | 34,592 psi | 53% | 2664 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 51,779 psi | 80% | 2927 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,992 psi | 72% | 2779 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,982 psi | 82% | 2877 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,833 psi | 72% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,785 psi | 63% | 2657 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 40,814 psi | 63% | 2746 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,638 psi | 59% | 2717 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,444 psi | 78% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,776 psi | 75% | 2812 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 31,488 psi | 48% | 2454 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 47,427 psi | 73% | 2822 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 33,547 psi | 52% | 2612 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,175 psi | 60% | 2723 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 48,341 psi | 74% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,814 psi | 63% | 2756 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 47,340 psi | 73% | 2828 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,707 psi | 52% | 2562 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 44% | 1775 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,777 psi | 77% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,167 psi | 74% | 2884 fps | 100% |
| ReloadSwiss RS 76 | 86.5 gr | 84% | 33,997 psi | 52% | 2638 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,959 psi | 65% | 2792 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 42,453 psi | 65% | 2703 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 40,611 psi | 63% | 2700 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 51,517 psi | 79% | 2851 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,444 psi | 78% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,776 psi | 75% | 2812 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,400 psi | 76% | 2772 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,292 psi | 62% | 2694 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 43,294 psi | 67% | 2684 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 45,585 psi | 70% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,104 psi | 63% | 2680 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 53,693 psi | 83% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,777 psi | 77% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,549 psi | 55% | 2549 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 49,211 psi | 76% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,784 psi | 61% | 2690 fps | 99.8% |
| Vihtavuori N560 | 81.9 gr | 82% | 42,192 psi | 65% | 2776 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 88% | 42,699 psi | 66% | 2766 fps | 96% |
| Vihtavuori N568 | <<locked>> | 94% | 46,485 psi | 72% | 2877 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 98% | 51,010 psi | 79% | 2992 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,458 psi | 76% | 2782 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,343 psi | 79% | 2900 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,358 psi | 50% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,695 psi | 58% | 2605 fps | 95.9% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | Peregrine Bushmaster (VRG-3). Hodgdon Retumbo delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,929 fps to 3,127 fps. ADI AR 2217 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 57–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.308" calls for a 1:14.0 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 165gr | Peregrine Bushmaster (VRG-3) 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.