Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | SUS-TAC HPT bullet and 72 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 57,159 psi | 88% | 2828 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,740 psi | 89% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,956 psi | 86% | 2927 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 58,610 psi | 90% | 2913 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 56,811 psi | 87% | 2923 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2887 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,487 psi | 76% | 2851 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,668 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,204 psi | 90% | 2904 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,101 psi | 88% | 2920 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,436 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,494 psi | 90% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,288 psi | 85% | 2917 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,170 psi | 80% | 2900 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,885 psi | 89% | 2877 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 56,057 psi | 86% | 2904 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,131 psi | 89% | 2953 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 57,101 psi | 88% | 2920 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,709 psi | 86% | 2805 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 56,608 psi | 87% | 2913 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,332 psi | 85% | 2854 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,653 psi | 89% | 2867 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 56,362 psi | 87% | 2861 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,303 psi | 85% | 2848 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,201 psi | 85% | 2782 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,188 psi | 88% | 3025 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,202 psi | 86% | 2890 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 57% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,653 psi | 89% | 2844 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,072 psi | 88% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,001 psi | 89% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,898 psi | 88% | 2841 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 94% | 58,711 psi | 90% | 2959 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,947 psi | 69% | 2759 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 57,928 psi | 89% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,246 psi | 87% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,465 psi | 90% | 2844 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,172 psi | 85% | 2844 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 45,455 psi | 70% | 2785 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 57,145 psi | 88% | 2940 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,927 psi | 86% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,637 psi | 86% | 2923 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 58,682 psi | 90% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,639 psi | 90% | 2910 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 59% | 1877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,972 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,405 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,552 psi | 90% | 3022 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 2979 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,811 psi | 86% | 2831 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 57,899 psi | 89% | 2897 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,709 psi | 86% | 2805 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,928 psi | 89% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,246 psi | 87% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,130 psi | 88% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,464 psi | 88% | 2890 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,464 psi | 88% | 2822 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 56,942 psi | 88% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,407 psi | 90% | 2864 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,870 psi | 89% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,566 psi | 89% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,160 psi | 90% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,956 psi | 88% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,797 psi | 87% | 2864 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,695 psi | 87% | 2936 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 57,145 psi | 88% | 2920 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 2979 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,187 psi | 85% | 2969 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,217 psi | 88% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,535 psi | 85% | 2858 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,696 psi | 89% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,494 psi | 90% | 2864 fps | 99.9% |
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% | 37,840 psi | 58% | 2510 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 50,256 psi | 77% | 2753 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,989 psi | 65% | 2677 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 41,887 psi | 64% | 2638 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 40,016 psi | 62% | 2625 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 38,957 psi | 60% | 2595 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 86% | 30,893 psi | 48% | 2441 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,109 psi | 74% | 2759 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,800 psi | 64% | 2631 fps | 97.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,768 psi | 58% | 2575 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,492 psi | 56% | 2539 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,618 psi | 49% | 2457 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,669 psi | 63% | 2684 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,443 psi | 75% | 2838 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,008 psi | 74% | 2717 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 35,201 psi | 54% | 2513 fps | 95.4% |
| Bofors RP30 | <<locked>> | 86% | 35,766 psi | 55% | 2552 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 37,768 psi | 58% | 2575 fps | 96.6% |
| Bofors RP7 | <<locked>> | 80% | 52,156 psi | 80% | 2753 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,202 psi | 57% | 2559 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 51,793 psi | 80% | 2802 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,041 psi | 83% | 2812 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,914 psi | 61% | 2575 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,959 psi | 65% | 2615 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,295 psi | 70% | 2638 fps | 100% |
| Hodgdon Retumbo | 73.7 gr | 82% | 32,938 psi | 51% | 2533 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,127 psi | 80% | 2828 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,659 psi | 73% | 2690 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,563 psi | 82% | 2776 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,688 psi | 73% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,466 psi | 64% | 2575 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 38,580 psi | 59% | 2605 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,506 psi | 56% | 2582 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,126 psi | 79% | 2726 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,588 psi | 76% | 2720 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,619 psi | 50% | 2395 fps | 97.3% |
| Norma 204 | <<locked>> | 80% | 48,095 psi | 74% | 2730 fps | 98.8% |
| Norma 217 | <<locked>> | 90% | 32,068 psi | 49% | 2493 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 39,914 psi | 61% | 2644 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 49,095 psi | 76% | 2740 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,450 psi | 59% | 2612 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 48,051 psi | 74% | 2740 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,937 psi | 49% | 2431 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,531 psi | 78% | 2772 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,718 psi | 75% | 2792 fps | 100% |
| ReloadSwiss RS 76 | 78.9 gr | 82% | 32,198 psi | 50% | 2507 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,293 psi | 65% | 2717 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,946 psi | 66% | 2615 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 41,278 psi | 64% | 2618 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 52,156 psi | 80% | 2753 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,126 psi | 79% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,588 psi | 76% | 2720 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,067 psi | 77% | 2677 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,930 psi | 63% | 2612 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 43,888 psi | 68% | 2598 fps | 96.4% |
| Somchem S365 | <<locked>> | 80% | 46,456 psi | 71% | 2694 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,843 psi | 64% | 2598 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 54,433 psi | 84% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,386 psi | 78% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,274 psi | 56% | 2474 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 49,879 psi | 77% | 2733 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,727 psi | 63% | 2612 fps | 100% |
| Vihtavuori N560 | 74.7 gr | 80% | 39,885 psi | 61% | 2635 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 86% | 40,437 psi | 62% | 2628 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 92% | 43,613 psi | 67% | 2733 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 51,227 psi | 79% | 2907 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,850 psi | 77% | 2680 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,996 psi | 80% | 2805 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,199 psi | 51% | 2569 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,377 psi | 59% | 2526 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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,025 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,025 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 180.0 gr projectile in 0.308" calls for a 1:9.5 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 | 180gr | SUS-TAC HPT 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.