Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | RWS Doppelkern bullet and 70 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% | 55,448 psi | 85% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,825 psi | 86% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,479 psi | 90% | 3061 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 56,898 psi | 88% | 2995 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 90% | 55,129 psi | 85% | 3002 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 3028 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,011 psi | 80% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,797 psi | 87% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,507 psi | 87% | 2986 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,550 psi | 85% | 2999 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,029 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,232 psi | 88% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,044 psi | 89% | 3054 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 3041 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,333 psi | 87% | 2956 fps | 97.1% |
| Bofors RP15 | <<locked>> | 94% | 58,639 psi | 90% | 3041 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 57,174 psi | 88% | 3038 fps | 99.6% |
| Bofors RP5 | <<locked>> | 90% | 55,550 psi | 85% | 2999 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 57,116 psi | 88% | 2936 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 55,143 psi | 85% | 2989 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 57,290 psi | 88% | 2989 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,566 psi | 90% | 2995 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,363 psi | 88% | 2982 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,130 psi | 88% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,043 psi | 86% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,407 psi | 90% | 3022 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,304 psi | 57% | 1939 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,695 psi | 86% | 2923 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,610 psi | 90% | 2959 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,144 psi | 86% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,216 psi | 85% | 2920 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 92% | 57,246 psi | 88% | 3041 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,485 psi | 73% | 2894 fps | 98.2% |
| Lovex S065 | <<locked>> | 82% | 55,999 psi | 86% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,015 psi | 89% | 2956 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,029 psi | 88% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,130 psi | 88% | 2979 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2917 fps | 99.7% |
| Norma MRP | <<locked>> | 88% | 55,535 psi | 85% | 3015 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,856 psi | 89% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,494 psi | 90% | 3061 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,956 psi | 88% | 2976 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,116 psi | 88% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1985 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,231 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,726 psi | 90% | 3038 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,348 psi | 88% | 3100 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,000 psi | 88% | 3058 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 57,696 psi | 89% | 2966 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 88% | 56,072 psi | 86% | 2976 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 57,116 psi | 88% | 2936 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,999 psi | 86% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,015 psi | 89% | 2956 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,013 psi | 85% | 2858 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,651 psi | 86% | 2969 fps | 99.7% |
| Somchem S361 | <<locked>> | 86% | 55,651 psi | 86% | 2897 fps | 98.6% |
| Somchem S365 | <<locked>> | 84% | 55,172 psi | 85% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,579 psi | 87% | 2946 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 55,637 psi | 86% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,492 psi | 87% | 2927 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 82% | 55,114 psi | 85% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,332 psi | 85% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,085 psi | 85% | 3009 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 94% | 55,767 psi | 86% | 2995 fps | 99% |
| Vihtavuori N568 | <<locked>> | 98% | 57,246 psi | 88% | 3058 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,552 psi | 90% | 3117 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,347 psi | 85% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,493 psi | 88% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,565 psi | 87% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,550 psi | 87% | 2940 fps | 99.7% |
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% | 39,378 psi | 61% | 2631 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 52,170 psi | 80% | 2884 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,758 psi | 67% | 2802 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 43,207 psi | 66% | 2759 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 41,582 psi | 64% | 2749 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 37,971 psi | 58% | 2657 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 32,242 psi | 50% | 2556 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,647 psi | 76% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,366 psi | 67% | 2756 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,247 psi | 60% | 2697 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,971 psi | 58% | 2654 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,735 psi | 50% | 2569 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,641 psi | 66% | 2805 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,372 psi | 79% | 2972 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,617 psi | 76% | 2841 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 36,477 psi | 56% | 2631 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 37,478 psi | 58% | 2674 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 39,247 psi | 60% | 2697 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 53,592 psi | 82% | 2881 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 38,711 psi | 60% | 2680 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 53,534 psi | 82% | 2933 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 41,292 psi | 64% | 2694 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,511 psi | 67% | 2740 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,789 psi | 72% | 2766 fps | 100% |
| Hodgdon Retumbo | 80.6 gr | 82% | 34,360 psi | 53% | 2654 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 54,346 psi | 84% | 2963 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1742 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,936 psi | 75% | 2815 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,911 psi | 85% | 2904 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,313 psi | 76% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,598 psi | 66% | 2694 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 82% | 40,190 psi | 62% | 2730 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 94% | 38,537 psi | 59% | 2710 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 52,605 psi | 81% | 2854 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,981 psi | 78% | 2848 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,750 psi | 52% | 2507 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 49,632 psi | 76% | 2858 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 33,634 psi | 52% | 2612 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 41,611 psi | 64% | 2769 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 50,604 psi | 78% | 2864 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 40,016 psi | 62% | 2733 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 49,647 psi | 76% | 2864 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 33,373 psi | 51% | 2546 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 44% | 1781 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,315 psi | 81% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,778 psi | 78% | 2923 fps | 100% |
| ReloadSwiss RS 76 | 86.2 gr | 82% | 33,649 psi | 52% | 2625 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,568 psi | 64% | 2779 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 44,396 psi | 68% | 2740 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 42,786 psi | 66% | 2743 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 53,592 psi | 82% | 2881 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,605 psi | 81% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,981 psi | 78% | 2848 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,416 psi | 79% | 2802 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,467 psi | 65% | 2736 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 45,455 psi | 70% | 2723 fps | 96.5% |
| Somchem S365 | <<locked>> | 80% | 48,037 psi | 74% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,323 psi | 67% | 2723 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 80% | 52,156 psi | 80% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,710 psi | 58% | 2592 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 51,547 psi | 79% | 2861 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,293 psi | 65% | 2733 fps | 100% |
| Vihtavuori N560 | 81.6 gr | 80% | 41,481 psi | 64% | 2756 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 42,264 psi | 65% | 2753 fps | 96% |
| Vihtavuori N568 | <<locked>> | 92% | 45,977 psi | 71% | 2861 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 50,415 psi | 78% | 2979 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,576 psi | 79% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,722 psi | 83% | 2936 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,070 psi | 54% | 2690 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,856 psi | 61% | 2644 fps | 96.7% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | RWS Doppelkern. Vihtavuori N570 delivers the highest muzzle velocity at 3,117 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,117 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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 | RWS Doppelkern they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.