Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 175gr | Berger VLD Hunting bullet and 71 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% | 55,187 psi | 85% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,608 psi | 86% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,117 psi | 89% | 2992 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 56,666 psi | 87% | 2927 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 90% | 54,926 psi | 85% | 2933 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2956 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,590 psi | 79% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,985 psi | 88% | 2923 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,768 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,333 psi | 87% | 2917 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,332 psi | 85% | 2930 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,724 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,869 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,798 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,940 psi | 85% | 2976 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,970 psi | 86% | 2887 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 58,146 psi | 89% | 2969 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 56,782 psi | 87% | 2969 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 55,332 psi | 85% | 2930 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 57,058 psi | 88% | 2867 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,911 psi | 85% | 2923 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 57,029 psi | 88% | 2917 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,160 psi | 90% | 2927 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,130 psi | 88% | 2910 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,043 psi | 88% | 2844 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,767 psi | 86% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,204 psi | 90% | 2953 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1877 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,637 psi | 86% | 2851 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,392 psi | 90% | 2887 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,043 psi | 86% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,668 psi | 90% | 2907 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 56,927 psi | 88% | 2972 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,123 psi | 73% | 2828 fps | 98.4% |
| Lovex S065 | <<locked>> | 82% | 55,912 psi | 86% | 2835 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,885 psi | 89% | 2884 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,826 psi | 87% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,898 psi | 88% | 2910 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 47,732 psi | 73% | 2854 fps | 99.8% |
| Norma MRP | <<locked>> | 88% | 55,332 psi | 85% | 2946 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,725 psi | 89% | 2904 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,102 psi | 89% | 2992 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,710 psi | 87% | 2907 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,782 psi | 87% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,203 psi | 59% | 1919 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,869 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,624 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,782 psi | 87% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,449 psi | 87% | 2989 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 57,464 psi | 88% | 2897 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 55,811 psi | 86% | 2904 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,058 psi | 88% | 2867 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,912 psi | 86% | 2835 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,885 psi | 89% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,624 psi | 90% | 2841 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,405 psi | 85% | 2900 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 55,506 psi | 85% | 2831 fps | 98.8% |
| Somchem S365 | <<locked>> | 84% | 55,056 psi | 85% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,434 psi | 87% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,448 psi | 85% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,202 psi | 86% | 2858 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 58,523 psi | 90% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,216 psi | 85% | 2877 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,784 psi | 90% | 3005 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 55,492 psi | 85% | 2930 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 56,942 psi | 88% | 2989 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3045 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,158 psi | 85% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,232 psi | 88% | 2920 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,086 psi | 86% | 2979 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,391 psi | 87% | 2871 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% | 39,276 psi | 60% | 2572 fps | 99% |
| Accurate 4350 | <<locked>> | 80% | 52,054 psi | 80% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,569 psi | 67% | 2743 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 43,250 psi | 67% | 2700 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 38,653 psi | 59% | 2628 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 37,768 psi | 58% | 2602 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 29,950 psi | 46% | 2441 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,656 psi | 67% | 2700 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,588 psi | 76% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,250 psi | 67% | 2694 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,175 psi | 60% | 2638 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,782 psi | 58% | 2595 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,764 psi | 50% | 2516 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,511 psi | 65% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,879 psi | 78% | 2907 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,414 psi | 76% | 2779 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 36,347 psi | 56% | 2572 fps | 95.8% |
| Bofors RP30 | <<locked>> | 86% | 37,347 psi | 57% | 2615 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 39,175 psi | 60% | 2638 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 53,592 psi | 82% | 2815 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 35,911 psi | 55% | 2559 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 53,403 psi | 82% | 2864 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,263 psi | 64% | 2635 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,509 psi | 62% | 2618 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,702 psi | 72% | 2697 fps | 100% |
| Hodgdon Retumbo | 77.4 gr | 82% | 34,243 psi | 53% | 2598 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 53,969 psi | 83% | 2894 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,007 psi | 43% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,979 psi | 75% | 2749 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,911 psi | 85% | 2838 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,182 psi | 76% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,627 psi | 66% | 2635 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 82% | 40,059 psi | 62% | 2671 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,232 psi | 59% | 2651 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 52,388 psi | 81% | 2785 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,807 psi | 78% | 2779 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,750 psi | 52% | 2451 fps | 97.6% |
| Norma 204 | <<locked>> | 80% | 49,516 psi | 76% | 2792 fps | 99% |
| Norma 217 | <<locked>> | 88% | 31,212 psi | 48% | 2497 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 41,365 psi | 64% | 2707 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 50,430 psi | 78% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,086 psi | 57% | 2612 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 49,501 psi | 76% | 2799 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,199 psi | 51% | 2490 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 44% | 1726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,272 psi | 80% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,604 psi | 78% | 2854 fps | 100% |
| ReloadSwiss RS 76 | 80.8 gr | 80% | 31,183 psi | 48% | 2507 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,205 psi | 63% | 2720 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,251 psi | 68% | 2674 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 42,656 psi | 66% | 2680 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 53,592 psi | 82% | 2815 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,388 psi | 81% | 2785 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,807 psi | 78% | 2779 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,329 psi | 79% | 2733 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,322 psi | 65% | 2674 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 45,310 psi | 70% | 2661 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 48,066 psi | 74% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,221 psi | 67% | 2661 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 80% | 52,054 psi | 80% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,623 psi | 58% | 2536 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 51,372 psi | 79% | 2792 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,250 psi | 65% | 2671 fps | 100% |
| Vihtavuori N560 | 78.3 gr | 80% | 41,263 psi | 64% | 2697 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 39,305 psi | 60% | 2635 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 42,438 psi | 65% | 2736 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 49,966 psi | 77% | 2917 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,459 psi | 79% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,548 psi | 82% | 2867 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,954 psi | 54% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,682 psi | 61% | 2585 fps | 97.1% |
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 71 powders for .300 Rem. Ultra Mag. loaded with the .308 | 175gr | Berger VLD Hunting. Vihtavuori N570 delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,045 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 175.0 gr projectile in 0.308" calls for a 1:12.0 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 175gr | Berger VLD Hunting 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.