Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | CutEdge MTH bullet and 76 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 Alliant Reloder-26.
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% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,885 psi | 89% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,188 psi | 88% | 2943 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 55,274 psi | 85% | 2874 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 57,261 psi | 88% | 2940 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,419 psi | 85% | 2900 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,835 psi | 77% | 2861 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,419 psi | 85% | 2871 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,419 psi | 85% | 2871 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,361 psi | 85% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,639 psi | 90% | 2917 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,392 psi | 88% | 2930 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,187 psi | 85% | 2844 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,071 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,767 psi | 86% | 2927 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,808 psi | 81% | 2913 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,349 psi | 90% | 2894 fps | 97.9% |
| Bofors RP15 | <<locked>> | 94% | 56,550 psi | 87% | 2917 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2966 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 57,392 psi | 88% | 2930 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,622 psi | 86% | 2812 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,246 psi | 88% | 2927 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,680 psi | 86% | 2867 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,117 psi | 89% | 2881 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 56,739 psi | 87% | 2874 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,680 psi | 86% | 2861 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,376 psi | 85% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,928 psi | 89% | 3041 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,594 psi | 87% | 2900 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 1844 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,001 psi | 89% | 2854 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,159 psi | 88% | 2835 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,204 psi | 90% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,305 psi | 88% | 2858 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 55,361 psi | 85% | 2920 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,136 psi | 69% | 2766 fps | 98.1% |
| Lovex S065 | <<locked>> | 84% | 58,015 psi | 89% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,260 psi | 87% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,450 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,492 psi | 85% | 2854 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 45,629 psi | 70% | 2792 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 57,638 psi | 89% | 2949 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,072 psi | 86% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,260 psi | 87% | 2933 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 55,245 psi | 85% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,839 psi | 84% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,101 psi | 59% | 1886 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,305 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,956 psi | 88% | 2917 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,940 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 2992 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 56,115 psi | 86% | 2844 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 58,059 psi | 89% | 2907 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,622 psi | 86% | 2812 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,015 psi | 89% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,260 psi | 87% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,101 psi | 88% | 2785 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,638 psi | 89% | 2900 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,827 psi | 89% | 2835 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 57,261 psi | 88% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,595 psi | 90% | 2877 fps | 100% |
| Unknown powder | <<locked>> | 82% | 56,057 psi | 86% | 2851 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,044 psi | 89% | 2769 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,899 psi | 89% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,392 psi | 90% | 2854 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 57,537 psi | 89% | 2867 fps | 96% |
| Vihtavuori N550 | <<locked>> | 84% | 56,942 psi | 88% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,058 psi | 88% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,246 psi | 88% | 2949 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 96% | 57,566 psi | 89% | 2930 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 54,853 psi | 84% | 2930 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 2986 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,609 psi | 89% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,883 psi | 86% | 2867 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,320 psi | 90% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,740 psi | 90% | 2874 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% | 37,492 psi | 58% | 2510 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 50,227 psi | 77% | 2756 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 42,656 psi | 66% | 2690 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 41,872 psi | 64% | 2644 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 80% | 37,333 psi | 57% | 2572 fps | 95% |
| ADI AR 2217 | <<locked>> | 88% | 36,448 psi | 56% | 2543 fps | 95% |
| ADI AR 2225 | <<locked>> | 86% | 30,676 psi | 47% | 2441 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,293 psi | 65% | 2644 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,293 psi | 65% | 2644 fps | 97.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,269 psi | 74% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,887 psi | 64% | 2638 fps | 97.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,724 psi | 58% | 2579 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,347 psi | 56% | 2539 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,357 psi | 48% | 2457 fps | 97.8% |
| Alliant Reloder-26 | 78.8 gr | 80% | 40,712 psi | 63% | 2684 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,791 psi | 75% | 2844 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,153 psi | 74% | 2726 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 35,012 psi | 54% | 2516 fps | 95.5% |
| Bofors RP30 | <<locked>> | 86% | 35,708 psi | 55% | 2556 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,724 psi | 58% | 2579 fps | 96.7% |
| Bofors RP7 | <<locked>> | 80% | 52,141 psi | 80% | 2762 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,159 psi | 57% | 2566 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 51,967 psi | 80% | 2812 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 54,317 psi | 84% | 2825 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,943 psi | 61% | 2582 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,189 psi | 60% | 2566 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,295 psi | 70% | 2648 fps | 100% |
| Hodgdon Retumbo | 75.5 gr | 82% | 32,764 psi | 50% | 2533 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,504 psi | 81% | 2838 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 43% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,659 psi | 73% | 2697 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,650 psi | 83% | 2785 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,558 psi | 73% | 2700 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,394 psi | 64% | 2582 fps | 96% |
| IMR 7828 SSC | <<locked>> | 82% | 38,725 psi | 60% | 2615 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,593 psi | 56% | 2589 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 51,068 psi | 79% | 2733 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,458 psi | 76% | 2726 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,053 psi | 49% | 2388 fps | 97.2% |
| Norma 204 | <<locked>> | 80% | 48,182 psi | 74% | 2740 fps | 98.9% |
| Norma 217 | <<locked>> | 90% | 31,792 psi | 49% | 2490 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 39,842 psi | 61% | 2651 fps | 98.5% |
| Norma URP | <<locked>> | 80% | 49,081 psi | 76% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,334 psi | 59% | 2615 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 48,109 psi | 74% | 2746 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,821 psi | 49% | 2434 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,500 psi | 44% | 1693 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,531 psi | 78% | 2779 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,066 psi | 76% | 2802 fps | 100% |
| ReloadSwiss RS 76 | 80.9 gr | 82% | 32,082 psi | 49% | 2507 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,525 psi | 65% | 2723 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 43,076 psi | 66% | 2625 fps | 97% |
| Rottweil R 905 | <<locked>> | 80% | 41,162 psi | 63% | 2625 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 80% | 52,141 psi | 80% | 2762 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,068 psi | 79% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,458 psi | 76% | 2726 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,125 psi | 77% | 2687 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,828 psi | 63% | 2618 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 43,947 psi | 68% | 2608 fps | 96.6% |
| Somchem S365 | <<locked>> | 80% | 46,383 psi | 71% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,727 psi | 64% | 2605 fps | 98.5% |
| Unknown powder | <<locked>> | 80% | 52,475 psi | 81% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 54,404 psi | 84% | 2726 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,560 psi | 78% | 2736 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,216 psi | 56% | 2480 fps | 96.8% |
| Vihtavuori N170 | <<locked>> | 96% | 53,635 psi | 83% | 2808 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,922 psi | 77% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,640 psi | 63% | 2615 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,827 psi | 61% | 2638 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 86% | 40,277 psi | 62% | 2631 fps | 96% |
| Vihtavuori N568 | <<locked>> | 92% | 43,787 psi | 67% | 2740 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 48,080 psi | 74% | 2854 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,082 psi | 77% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,156 psi | 80% | 2815 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,228 psi | 51% | 2569 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,334 psi | 59% | 2533 fps | 96.8% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | CutEdge MTH. Hodgdon Retumbo delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,844 fps to 3,041 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 180.0 gr projectile in 0.308" calls for a 1:11.0 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, ReloadSwiss RS 76, Alliant Reloder-26 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | CutEdge MTH 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.