Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 170gr | Sako Powerhead Blade bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, IMR 7828 SSC and Winchester StaBALL HD.
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% | 57,798 psi | 89% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,798 psi | 90% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,014 psi | 88% | 3005 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 56,188 psi | 86% | 2949 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 58,160 psi | 90% | 3015 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,243 psi | 80% | 2907 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,804 psi | 72% | 2867 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,304 psi | 87% | 2946 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,159 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,217 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,608 psi | 86% | 2936 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,175 psi | 90% | 3005 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,579 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,361 psi | 85% | 2979 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,217 psi | 87% | 3002 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,883 psi | 86% | 2910 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 57,072 psi | 88% | 2986 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,085 psi | 85% | 2976 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 58,175 psi | 90% | 3005 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 56,971 psi | 88% | 2897 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,957 psi | 89% | 2999 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 56,739 psi | 87% | 2946 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,463 psi | 85% | 2904 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,740 psi | 89% | 2949 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,478 psi | 87% | 2930 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,275 psi | 87% | 2871 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,233 psi | 90% | 3110 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,812 psi | 89% | 2982 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 57% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,419 psi | 85% | 2881 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,552 psi | 90% | 2920 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,347 psi | 85% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,465 psi | 90% | 2933 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 55,912 psi | 86% | 2986 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,047 psi | 65% | 2766 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 55,463 psi | 85% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,290 psi | 88% | 2907 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,201 psi | 85% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,463 psi | 87% | 2933 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 42,293 psi | 65% | 2789 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 58,305 psi | 90% | 3025 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,985 psi | 88% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,927 psi | 88% | 3009 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,057 psi | 86% | 2930 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,535 psi | 85% | 2936 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,100 psi | 85% | 2910 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,885 psi | 89% | 2995 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,201 psi | 85% | 3041 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,592 psi | 84% | 2995 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 82% | 58,392 psi | 90% | 2890 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,188 psi | 88% | 2920 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,129 psi | 85% | 2923 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,971 psi | 88% | 2897 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,463 psi | 85% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,290 psi | 88% | 2907 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,769 psi | 89% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,566 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,595 psi | 90% | 2976 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,740 psi | 89% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,085 psi | 85% | 2851 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 58,001 psi | 89% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,564 psi | 86% | 2894 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,666 psi | 86% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,114 psi | 85% | 2867 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,317 psi | 85% | 2877 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,102 psi | 89% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,508 psi | 89% | 2946 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,943 psi | 89% | 3022 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 58,030 psi | 89% | 2999 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,158 psi | 85% | 2995 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,926 psi | 85% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,739 psi | 87% | 2946 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,494 psi | 90% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,637 psi | 86% | 2890 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% | 35,244 psi | 54% | 2516 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 47,442 psi | 73% | 2779 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,701 psi | 70% | 2815 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 39,726 psi | 61% | 2657 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 40,712 psi | 63% | 2703 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 39,421 psi | 61% | 2661 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 33,141 psi | 51% | 2559 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,016 psi | 62% | 2654 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,759 psi | 70% | 2792 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,243 psi | 82% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,610 psi | 61% | 2648 fps | 96.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,418 psi | 55% | 2582 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,113 psi | 53% | 2552 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,559 psi | 45% | 2454 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,884 psi | 58% | 2687 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 49,197 psi | 76% | 2795 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 37,826 psi | 58% | 2638 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 38,479 psi | 59% | 2674 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 35,418 psi | 55% | 2582 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 49,951 psi | 77% | 2785 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,608 psi | 58% | 2625 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 49,298 psi | 76% | 2831 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,764 psi | 80% | 2848 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,555 psi | 67% | 2710 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,743 psi | 66% | 2694 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,960 psi | 66% | 2671 fps | 100% |
| Hodgdon Retumbo | 78.4 gr | 86% | 35,476 psi | 55% | 2657 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,501 psi | 76% | 2854 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 42% | 1690 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,556 psi | 70% | 2717 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,517 psi | 79% | 2812 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,208 psi | 70% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,221 psi | 65% | 2654 fps | 95.5% |
| IMR 7828 SSC | 76.5 gr | 84% | 39,131 psi | 60% | 2677 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,146 psi | 60% | 2700 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,892 psi | 75% | 2759 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,268 psi | 73% | 2749 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,153 psi | 46% | 2392 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 45,759 psi | 70% | 2753 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,026 psi | 52% | 2602 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 37,333 psi | 57% | 2654 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 46,688 psi | 72% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,841 psi | 60% | 2680 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 45,614 psi | 70% | 2762 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,708 psi | 53% | 2556 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 43% | 1732 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,747 psi | 73% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,209 psi | 71% | 2818 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,387 psi | 50% | 2566 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,844 psi | 66% | 2785 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 54,607 psi | 84% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,886 psi | 63% | 2635 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,986 psi | 60% | 2635 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 49,951 psi | 77% | 2785 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,892 psi | 75% | 2759 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,268 psi | 73% | 2749 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,273 psi | 84% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,848 psi | 74% | 2707 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,653 psi | 59% | 2628 fps | 96.3% |
| Somchem S355 | <<locked>> | 80% | 54,288 psi | 84% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,829 psi | 64% | 2621 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,816 psi | 67% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,450 psi | 61% | 2615 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 52,083 psi | 80% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,008 psi | 74% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,113 psi | 53% | 2484 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 47,413 psi | 73% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,101 psi | 59% | 2625 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,395 psi | 67% | 2772 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 88% | 40,712 psi | 63% | 2694 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 44,034 psi | 68% | 2802 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,616 psi | 73% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,501 psi | 76% | 2835 fps | 99.6% |
| Winchester StaBALL HD | 74.9 gr | 80% | 30,327 psi | 47% | 2566 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,143 psi | 56% | 2539 fps | 95.3% |
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 .308 | 170gr | Sako Powerhead Blade. Hodgdon Retumbo delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,110 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 170.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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, IMR 7828 SSC, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 170gr | Sako Powerhead Blade 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.