Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Norma Diamond 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, Winchester StaBALL HD and ReloadSwiss RS 76.
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% | 58,552 psi | 90% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,187 psi | 85% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,450 psi | 88% | 3025 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 56,086 psi | 86% | 2966 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 58,349 psi | 90% | 3031 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,550 psi | 87% | 2989 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,213 psi | 79% | 2953 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,173 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,753 psi | 86% | 2953 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,639 psi | 90% | 3025 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,246 psi | 87% | 2940 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,159 psi | 86% | 2999 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,087 psi | 88% | 3025 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,259 psi | 84% | 3005 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,637 psi | 86% | 2927 fps | 97% |
| Bofors RP15 | <<locked>> | 94% | 57,580 psi | 89% | 3009 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,028 psi | 86% | 3002 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 58,639 psi | 90% | 3025 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,579 psi | 87% | 2907 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 58,421 psi | 90% | 3022 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 56,608 psi | 87% | 2959 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,769 psi | 90% | 2969 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,696 psi | 89% | 2966 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,492 psi | 87% | 2946 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,391 psi | 87% | 2884 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,998 psi | 85% | 3074 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,667 psi | 89% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 58% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,697 psi | 90% | 2943 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,899 psi | 89% | 2930 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,608 psi | 86% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,131 psi | 89% | 2946 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 56,347 psi | 87% | 3009 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,601 psi | 72% | 2861 fps | 98% |
| Lovex S065 | <<locked>> | 82% | 55,448 psi | 85% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,319 psi | 88% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,086 psi | 86% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,376 psi | 87% | 2946 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 47,152 psi | 73% | 2884 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 58,653 psi | 90% | 3041 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,087 psi | 88% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,566 psi | 89% | 3028 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 56,188 psi | 86% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,173 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,203 psi | 59% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,347 psi | 85% | 2927 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,928 psi | 89% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,246 psi | 87% | 3064 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,767 psi | 86% | 3022 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 88% | 56,956 psi | 88% | 2933 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 88% | 55,448 psi | 85% | 2946 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 56,579 psi | 87% | 2907 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,448 psi | 85% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,319 psi | 88% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,030 psi | 89% | 2877 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,653 psi | 90% | 2995 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 54,882 psi | 84% | 2864 fps | 98.5% |
| Somchem S365 | <<locked>> | 86% | 58,233 psi | 90% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,869 psi | 86% | 2913 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 82% | 55,100 psi | 85% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,666 psi | 86% | 2897 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 58,044 psi | 89% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,189 psi | 90% | 2966 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,146 psi | 89% | 3041 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 55,013 psi | 85% | 2966 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 98% | 56,202 psi | 86% | 3025 fps | 98.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 3081 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,639 psi | 90% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,797 psi | 87% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,463 psi | 85% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,912 psi | 86% | 2910 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% | 38,841 psi | 60% | 2602 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 51,532 psi | 79% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,047 psi | 66% | 2772 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 42,656 psi | 66% | 2730 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 40,973 psi | 63% | 2720 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 40,016 psi | 62% | 2690 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 31,705 psi | 49% | 2526 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,153 psi | 76% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,815 psi | 66% | 2726 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,740 psi | 60% | 2671 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,376 psi | 58% | 2628 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,256 psi | 50% | 2543 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,945 psi | 65% | 2776 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,328 psi | 77% | 2940 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,037 psi | 75% | 2812 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 35,940 psi | 55% | 2602 fps | 95.2% |
| Bofors RP30 | <<locked>> | 86% | 36,869 psi | 57% | 2644 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 38,740 psi | 60% | 2671 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 53,026 psi | 82% | 2851 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 38,087 psi | 59% | 2648 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 52,808 psi | 81% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,114 psi | 85% | 2917 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 40,799 psi | 63% | 2667 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,931 psi | 66% | 2710 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,282 psi | 71% | 2736 fps | 100% |
| Hodgdon Retumbo | 78.7 gr | 82% | 33,808 psi | 52% | 2621 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 53,534 psi | 82% | 2933 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 43% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,385 psi | 74% | 2782 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,331 psi | 84% | 2874 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,704 psi | 75% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,119 psi | 65% | 2664 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 39,552 psi | 61% | 2697 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,782 psi | 58% | 2680 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,025 psi | 80% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,401 psi | 78% | 2818 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,301 psi | 51% | 2480 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 48,994 psi | 75% | 2828 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 33,025 psi | 51% | 2582 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 40,930 psi | 63% | 2740 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 49,995 psi | 77% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,436 psi | 61% | 2707 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 48,950 psi | 75% | 2835 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 32,851 psi | 51% | 2520 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,605 psi | 79% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,908 psi | 77% | 2890 fps | 100% |
| ReloadSwiss RS 76 | 84.2 gr | 82% | 33,098 psi | 51% | 2595 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,077 psi | 68% | 2818 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,888 psi | 68% | 2710 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 42,221 psi | 65% | 2713 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 53,026 psi | 82% | 2851 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,025 psi | 80% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,401 psi | 78% | 2818 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,937 psi | 78% | 2772 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,901 psi | 64% | 2710 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 44,788 psi | 69% | 2690 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 47,369 psi | 73% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,786 psi | 66% | 2694 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 80% | 51,547 psi | 79% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,217 psi | 57% | 2566 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,850 psi | 78% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,814 psi | 64% | 2707 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,843 psi | 63% | 2730 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 41,582 psi | 64% | 2723 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 92% | 45,107 psi | 69% | 2831 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 53,185 psi | 82% | 3012 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,010 psi | 79% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,997 psi | 82% | 2904 fps | 99.9% |
| Winchester StaBALL HD | 78.8 gr | 80% | 34,316 psi | 53% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,247 psi | 60% | 2618 fps | 96.6% |
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 | 168gr | Norma Diamond. Vihtavuori N570 delivers the highest muzzle velocity at 3,081 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,081 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 58–90 %, leaving at least 10 % headroom. The 168.0 gr projectile in 0.308" calls for a 1:13.5 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Norma Diamond 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.