Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Sako SuperHammerhead bullet and 69 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 ReloadSwiss RS 80.
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% | 57,203 psi | 88% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,508 psi | 89% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,014 psi | 86% | 2927 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 58,479 psi | 90% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,797 psi | 87% | 2927 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,172 psi | 85% | 2897 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,837 psi | 80% | 2923 fps | 96.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,867 psi | 83% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,740 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,523 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,073 psi | 89% | 2910 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,188 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,071 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,187 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,724 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,406 psi | 88% | 2979 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,624 psi | 89% | 2884 fps | 97.9% |
| Bofors RP15 | <<locked>> | 92% | 56,362 psi | 87% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,085 psi | 85% | 2910 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,188 psi | 88% | 2923 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,465 psi | 90% | 2854 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,768 psi | 87% | 2920 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 56,028 psi | 86% | 2864 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,085 psi | 85% | 2848 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,668 psi | 90% | 2831 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,131 psi | 89% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,058 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,827 psi | 89% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,565 psi | 87% | 2844 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 90% | 54,926 psi | 85% | 2907 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,197 psi | 76% | 2831 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,319 psi | 88% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,695 psi | 86% | 2818 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,653 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,639 psi | 90% | 2900 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,951 psi | 77% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,305 psi | 88% | 2943 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,550 psi | 85% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,072 psi | 86% | 2927 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,494 psi | 90% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,723 psi | 84% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,754 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,420 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,897 psi | 84% | 2966 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,784 psi | 90% | 2989 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 55,390 psi | 85% | 2835 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 57,653 psi | 89% | 2897 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,465 psi | 90% | 2854 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,319 psi | 88% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,695 psi | 86% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,246 psi | 87% | 2776 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,232 psi | 88% | 2894 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 57,072 psi | 88% | 2822 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 56,840 psi | 87% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,175 psi | 90% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,217 psi | 88% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,102 psi | 89% | 2851 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,232 psi | 88% | 2861 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 82% | 56,536 psi | 87% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,942 psi | 88% | 2864 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,811 psi | 87% | 2940 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 57,595 psi | 89% | 2927 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 54,998 psi | 85% | 2930 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 56,159 psi | 86% | 2986 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,811 psi | 87% | 2776 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,769 psi | 90% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,131 psi | 89% | 2864 fps | 100% |
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% | 40,669 psi | 63% | 2569 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,722 psi | 83% | 2805 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,076 psi | 65% | 2680 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,628 psi | 69% | 2694 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 39,943 psi | 61% | 2628 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 36,535 psi | 56% | 2543 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 48,167 psi | 74% | 2851 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 31,096 psi | 48% | 2448 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,020 psi | 69% | 2694 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,213 psi | 79% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,599 psi | 69% | 2687 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,582 psi | 62% | 2638 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,233 psi | 60% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,953 psi | 52% | 2516 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,338 psi | 68% | 2743 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,240 psi | 76% | 2848 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,572 psi | 73% | 2717 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,797 psi | 58% | 2572 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 36,274 psi | 56% | 2559 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 40,582 psi | 62% | 2638 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 54,984 psi | 85% | 2802 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,621 psi | 53% | 2500 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 80% | 42,540 psi | 65% | 2631 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,814 psi | 64% | 2618 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,211 psi | 74% | 2687 fps | 100% |
| Hodgdon Retumbo | 76.3 gr | 80% | 33,127 psi | 51% | 2539 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 43% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,357 psi | 78% | 2740 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,676 psi | 78% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,845 psi | 67% | 2628 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,624 psi | 59% | 2608 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,260 psi | 57% | 2598 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,388 psi | 81% | 2772 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,998 psi | 54% | 2451 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 51,140 psi | 79% | 2789 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,385 psi | 47% | 2444 fps | 95% |
| Norma MRP | <<locked>> | 80% | 43,018 psi | 66% | 2707 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,141 psi | 80% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,464 psi | 59% | 2615 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 51,184 psi | 79% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,606 psi | 53% | 2497 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,853 psi | 83% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,286 psi | 80% | 2844 fps | 100% |
| ReloadSwiss RS 76 | 81.7 gr | 80% | 32,430 psi | 50% | 2513 fps | 96.7% |
| ReloadSwiss RS 80 | 90.5 gr | 88% | 39,813 psi | 61% | 2661 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 45,542 psi | 70% | 2671 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,063 psi | 68% | 2674 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 54,984 psi | 85% | 2802 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,780 psi | 83% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,388 psi | 81% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,707 psi | 81% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,729 psi | 67% | 2671 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 46,543 psi | 72% | 2654 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 49,748 psi | 77% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,585 psi | 69% | 2654 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,548 psi | 82% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,856 psi | 60% | 2533 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 94% | 53,432 psi | 82% | 2802 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 52,823 psi | 81% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,772 psi | 67% | 2664 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,815 psi | 66% | 2697 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 38,000 psi | 58% | 2575 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,162 psi | 63% | 2677 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 48,385 psi | 74% | 2854 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,084 psi | 82% | 2726 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,854 psi | 57% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,988 psi | 63% | 2582 fps | 97.8% |
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 69 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Sako SuperHammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,038 fps. ADI AR 2218 gives the best case fill at 100 %, and 69 of the 69 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 180.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Sako SuperHammerhead 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.