Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .306 | 160gr | 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 Vihtavuori N560, Accurate MAGPRO and Ramshot Grand.
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% | 56,637 psi | 87% | 2963 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,464 psi | 88% | 3002 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,695 psi | 86% | 3054 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 58,088 psi | 89% | 2969 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,897 psi | 84% | 2999 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 56,739 psi | 87% | 3061 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,010 psi | 79% | 2953 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,585 psi | 70% | 2907 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,216 psi | 85% | 2999 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,610 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,941 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,175 psi | 90% | 3045 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,782 psi | 87% | 3054 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,088 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,870 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,737 psi | 84% | 3054 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 58,465 psi | 90% | 3015 fps | 96.8% |
| Bofors RP15 | <<locked>> | 96% | 55,883 psi | 86% | 3038 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 3022 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 56,782 psi | 87% | 3054 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 55,869 psi | 86% | 2953 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 3045 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,579 psi | 86% | 2999 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 58,088 psi | 89% | 3015 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 56,521 psi | 87% | 2999 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,259 psi | 85% | 2979 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,071 psi | 85% | 2930 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,681 psi | 87% | 3159 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,536 psi | 87% | 3035 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1942 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,943 psi | 89% | 2989 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,435 psi | 88% | 2976 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 57,885 psi | 89% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,377 psi | 88% | 2986 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 58,624 psi | 90% | 3100 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 57,943 psi | 89% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,231 psi | 87% | 2966 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,448 psi | 85% | 2989 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,046 psi | 63% | 2825 fps | 98% |
| Norma MRP | <<locked>> | 92% | 56,797 psi | 87% | 3074 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,811 psi | 86% | 2986 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,448 psi | 85% | 3054 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 54,998 psi | 85% | 2986 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 58,595 psi | 90% | 3048 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 58% | 1985 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,899 psi | 89% | 3022 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,565 psi | 87% | 3051 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,160 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 3031 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 57,232 psi | 88% | 2953 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,970 psi | 86% | 2972 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 57,754 psi | 89% | 3035 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 55,869 psi | 86% | 2953 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,943 psi | 89% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,231 psi | 87% | 2966 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,927 psi | 88% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,305 psi | 88% | 2920 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,319 psi | 88% | 3031 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 56,666 psi | 87% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,885 psi | 89% | 2959 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 56,594 psi | 87% | 2986 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,088 psi | 89% | 3002 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 58,233 psi | 90% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,769 psi | 89% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,986 psi | 89% | 2982 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 56,913 psi | 88% | 2979 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,260 psi | 87% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,507 psi | 87% | 3071 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 56,565 psi | 87% | 3045 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,722 psi | 83% | 3038 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,682 psi | 89% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,579 psi | 86% | 2999 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,681 psi | 87% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,668 psi | 90% | 3002 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% | 34,330 psi | 53% | 2556 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 46,311 psi | 71% | 2828 fps | 100% |
| Accurate MAGPRO | 84.5 gr | 86% | 44,541 psi | 69% | 2854 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 54,476 psi | 84% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,696 psi | 60% | 2697 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 42,641 psi | 66% | 2805 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 94% | 41,292 psi | 64% | 2762 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 34,592 psi | 53% | 2654 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,088 psi | 60% | 2697 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,556 psi | 69% | 2841 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,866 psi | 80% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,725 psi | 60% | 2690 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,130 psi | 57% | 2687 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,112 psi | 51% | 2592 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,864 psi | 48% | 2549 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,753 psi | 57% | 2726 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,401 psi | 79% | 2897 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 39,552 psi | 61% | 2736 fps | 95.9% |
| Bofors RP30 | <<locked>> | 92% | 40,205 psi | 62% | 2772 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 37,130 psi | 57% | 2687 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 49,081 psi | 76% | 2838 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 39,450 psi | 61% | 2726 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,356 psi | 74% | 2884 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 50,720 psi | 78% | 2897 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 45,788 psi | 70% | 2815 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,744 psi | 69% | 2795 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,858 psi | 64% | 2720 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,130 psi | 57% | 2759 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 48,428 psi | 75% | 2904 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 42% | 1745 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,512 psi | 69% | 2766 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,430 psi | 78% | 2864 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,063 psi | 68% | 2776 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,121 psi | 68% | 2756 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 40,988 psi | 63% | 2779 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 47,848 psi | 74% | 2812 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,195 psi | 71% | 2799 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 31,473 psi | 48% | 2487 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 44,686 psi | 69% | 2799 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 35,592 psi | 55% | 2700 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 36,230 psi | 56% | 2690 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 45,513 psi | 70% | 2818 fps | 99.9% |
| Ramshot Grand | 82.2 gr | 86% | 40,785 psi | 63% | 2785 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,512 psi | 69% | 2812 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 36,506 psi | 56% | 2657 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 43% | 1785 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,702 psi | 72% | 2848 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,092 psi | 69% | 2871 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,939 psi | 52% | 2664 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,976 psi | 69% | 2890 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 53,359 psi | 82% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,844 psi | 66% | 2740 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,043 psi | 59% | 2677 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 49,081 psi | 76% | 2838 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,848 psi | 74% | 2812 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,195 psi | 71% | 2799 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,301 psi | 82% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,963 psi | 72% | 2756 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,710 psi | 58% | 2671 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 53,113 psi | 82% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,845 psi | 67% | 2723 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,554 psi | 65% | 2769 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,522 psi | 59% | 2657 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,923 psi | 78% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,007 psi | 72% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,795 psi | 55% | 2585 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 46,383 psi | 71% | 2815 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,159 psi | 57% | 2671 fps | 99.3% |
| Vihtavuori N560 | 82.9 gr | 86% | 45,455 psi | 70% | 2877 fps | 96% |
| Vihtavuori N565 | <<locked>> | 90% | 42,511 psi | 65% | 2792 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 46,311 psi | 71% | 2907 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,601 psi | 72% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,356 psi | 74% | 2884 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,399 psi | 45% | 2595 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,956 psi | 58% | 2638 fps | 95.4% |
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 .306 | 160gr | Peregrine Plainsmaster (VLR-4). Hodgdon Retumbo delivers the highest muzzle velocity at 3,159 fps; across all powders the maximum-charge window runs from 1,942 fps to 3,159 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 160.0 gr projectile in 0.306" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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 N560, Accurate MAGPRO, Ramshot Grand rank at the top here: for .300 Rem. Ultra Mag. with the .306 | 160gr | 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.