Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | RWS Speed Tip Professional 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>> | 92% | 55,927 psi | 86% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,637 psi | 87% | 2949 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,798 psi | 90% | 3064 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 90% | 57,609 psi | 89% | 3005 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,753 psi | 86% | 3009 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,998 psi | 83% | 2966 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 2927 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,624 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,232 psi | 88% | 2992 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,014 psi | 86% | 3005 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,363 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,159 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,262 psi | 90% | 3061 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,072 psi | 88% | 2959 fps | 96.9% |
| Bofors RP15 | <<locked>> | 94% | 54,998 psi | 85% | 2989 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,145 psi | 88% | 3038 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 56,014 psi | 86% | 3005 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 58,233 psi | 90% | 2946 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 55,535 psi | 85% | 2992 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 58,146 psi | 89% | 2999 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,797 psi | 87% | 2956 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 55,303 psi | 85% | 2943 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,175 psi | 90% | 2986 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,711 psi | 89% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,985 psi | 86% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,085 psi | 85% | 2972 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 57% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,623 psi | 87% | 2933 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,072 psi | 86% | 2917 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 56,898 psi | 88% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,086 psi | 86% | 2930 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 57,667 psi | 89% | 3045 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,845 psi | 67% | 2828 fps | 97% |
| Lovex S065 | <<locked>> | 84% | 56,971 psi | 88% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,201 psi | 85% | 2910 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,435 psi | 88% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,117 psi | 89% | 2989 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 44,193 psi | 68% | 2854 fps | 99% |
| Norma MRP | <<locked>> | 90% | 55,927 psi | 86% | 3025 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,668 psi | 90% | 2982 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,740 psi | 90% | 3064 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,740 psi | 89% | 2989 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,508 psi | 89% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,971 psi | 58% | 1965 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,826 psi | 87% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,332 psi | 85% | 2992 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,246 psi | 88% | 3104 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,695 psi | 87% | 3054 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 90% | 58,552 psi | 90% | 2972 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,666 psi | 87% | 2979 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 58,233 psi | 90% | 2946 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,971 psi | 88% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,201 psi | 85% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,275 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,231 psi | 87% | 2976 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 56,507 psi | 87% | 2904 fps | 98.5% |
| Somchem S365 | <<locked>> | 86% | 55,767 psi | 86% | 2930 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,319 psi | 88% | 2953 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 57,000 psi | 88% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,579 psi | 87% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,072 psi | 88% | 2933 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,898 psi | 86% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,593 psi | 86% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,579 psi | 86% | 3018 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 96% | 56,072 psi | 86% | 2999 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,232 psi | 88% | 3054 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,260 psi | 87% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,349 psi | 90% | 3002 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,188 psi | 86% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,406 psi | 88% | 2946 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% | 37,043 psi | 57% | 2582 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 49,342 psi | 76% | 2838 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,034 psi | 68% | 2808 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 40,988 psi | 63% | 2710 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 42,018 psi | 65% | 2759 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 40,886 psi | 63% | 2723 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 88% | 32,387 psi | 50% | 2559 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,949 psi | 72% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,060 psi | 63% | 2707 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,927 psi | 57% | 2644 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,607 psi | 55% | 2612 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,864 psi | 48% | 2516 fps | 96.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,537 psi | 61% | 2749 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,299 psi | 77% | 2844 fps | 95.2% |
| Bofors RP15 | <<locked>> | 82% | 36,767 psi | 57% | 2638 fps | 95.2% |
| Bofors RP30 | <<locked>> | 90% | 40,292 psi | 62% | 2740 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 36,927 psi | 57% | 2644 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 51,329 psi | 79% | 2841 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 38,986 psi | 60% | 2684 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,792 psi | 78% | 2887 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 53,185 psi | 82% | 2904 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 82% | 41,989 psi | 65% | 2703 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 44,034 psi | 68% | 2749 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,266 psi | 68% | 2723 fps | 100% |
| Hodgdon Retumbo | 80.4 gr | 86% | 36,956 psi | 57% | 2723 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,184 psi | 79% | 2913 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 43% | 1726 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,804 psi | 72% | 2772 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,678 psi | 81% | 2864 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,717 psi | 72% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,352 psi | 67% | 2703 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 40,480 psi | 62% | 2736 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,232 psi | 59% | 2707 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 50,328 psi | 77% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,689 psi | 75% | 2805 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 31,734 psi | 49% | 2457 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 47,137 psi | 73% | 2812 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 33,402 psi | 51% | 2608 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 38,856 psi | 60% | 2717 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 48,124 psi | 74% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,364 psi | 62% | 2740 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 47,050 psi | 72% | 2818 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 33,692 psi | 52% | 2556 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,342 psi | 76% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,616 psi | 73% | 2874 fps | 100% |
| ReloadSwiss RS 76 | 84 gr | 84% | 33,823 psi | 52% | 2628 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,773 psi | 69% | 2851 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 42,148 psi | 65% | 2690 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 40,364 psi | 62% | 2690 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 51,329 psi | 79% | 2841 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,328 psi | 77% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,689 psi | 75% | 2805 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,168 psi | 76% | 2759 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,016 psi | 62% | 2687 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 43,105 psi | 66% | 2674 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 45,353 psi | 70% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,002 psi | 63% | 2674 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 53,505 psi | 82% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,559 psi | 76% | 2818 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,578 psi | 55% | 2543 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,979 psi | 75% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,784 psi | 61% | 2687 fps | 99.8% |
| Vihtavuori N560 | 79.5 gr | 82% | 41,742 psi | 64% | 2762 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 42,351 psi | 65% | 2756 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 45,963 psi | 71% | 2864 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,863 psi | 75% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,981 psi | 78% | 2890 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,068 psi | 49% | 2631 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,579 psi | 58% | 2595 fps | 95.7% |
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 Speed Tip Professional. Hodgdon Retumbo delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,110 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 1:12.0 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 Speed Tip Professional they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.