Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 182gr | CutEdge MTAC bullet and 74 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 IMR 7828 SSC.
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% | 57,508 psi | 89% | 2828 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,204 psi | 90% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,739 psi | 87% | 2930 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 55,593 psi | 86% | 2867 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 57,638 psi | 89% | 2930 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,811 psi | 86% | 2894 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,227 psi | 77% | 2854 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 55,927 psi | 86% | 2864 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,695 psi | 86% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,288 psi | 85% | 2858 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,783 psi | 89% | 2923 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,550 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,492 psi | 85% | 2897 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,202 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2910 fps | 97% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,726 psi | 90% | 2890 fps | 98% |
| Bofors RP15 | <<locked>> | 94% | 56,913 psi | 88% | 2910 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 55,201 psi | 85% | 2907 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 57,783 psi | 89% | 2923 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 56,115 psi | 86% | 2808 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,667 psi | 89% | 2923 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 55,999 psi | 86% | 2858 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,421 psi | 90% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,072 psi | 88% | 2867 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,028 psi | 86% | 2851 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,883 psi | 86% | 2785 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,392 psi | 90% | 3035 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,985 psi | 88% | 2890 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 57% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,276 psi | 90% | 2848 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,624 psi | 89% | 2828 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,537 psi | 90% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,595 psi | 89% | 2848 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 55,767 psi | 86% | 2910 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,716 psi | 70% | 2766 fps | 98.3% |
| Lovex S065 | <<locked>> | 84% | 58,276 psi | 90% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,768 psi | 87% | 2825 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,172 psi | 85% | 2795 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,796 psi | 86% | 2848 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2789 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 58,030 psi | 89% | 2943 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,579 psi | 87% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,739 psi | 87% | 2930 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 55,550 psi | 85% | 2844 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,274 psi | 85% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,682 psi | 90% | 2881 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,319 psi | 88% | 2907 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,419 psi | 85% | 2966 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 54,621 psi | 84% | 2920 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 56,405 psi | 87% | 2838 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 58,653 psi | 90% | 2900 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 56,115 psi | 86% | 2808 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,276 psi | 90% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,768 psi | 87% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,595 psi | 89% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,233 psi | 90% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 58,146 psi | 89% | 2828 fps | 99.3% |
| Somchem S365 | <<locked>> | 86% | 57,609 psi | 89% | 2838 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,071 psi | 85% | 2815 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,334 psi | 90% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,233 psi | 90% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,984 psi | 85% | 2799 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 57,914 psi | 89% | 2861 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 84% | 57,493 psi | 88% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,421 psi | 88% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,624 psi | 89% | 2943 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 57,972 psi | 89% | 2923 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 55,347 psi | 85% | 2927 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,362 psi | 87% | 2982 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,928 psi | 89% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,202 psi | 86% | 2861 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,723 psi | 84% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,245 psi | 85% | 2812 fps | 99.8% |
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% | 37,768 psi | 58% | 2503 fps | 98.9% |
| Accurate 4350 | <<locked>> | 80% | 50,502 psi | 78% | 2749 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,293 psi | 65% | 2677 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 42,134 psi | 65% | 2638 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 80% | 37,594 psi | 58% | 2566 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 88% | 36,695 psi | 56% | 2539 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 86% | 31,009 psi | 48% | 2441 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,525 psi | 65% | 2638 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,559 psi | 75% | 2759 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,134 psi | 65% | 2631 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,985 psi | 58% | 2575 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,608 psi | 56% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,575 psi | 49% | 2451 fps | 98% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,075 psi | 63% | 2680 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,226 psi | 76% | 2841 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,399 psi | 74% | 2720 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 35,244 psi | 54% | 2510 fps | 95.7% |
| Bofors RP30 | <<locked>> | 86% | 35,998 psi | 55% | 2549 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 37,985 psi | 58% | 2575 fps | 96.9% |
| Bofors RP7 | <<locked>> | 80% | 52,576 psi | 81% | 2756 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,766 psi | 54% | 2497 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 52,243 psi | 80% | 2802 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 54,578 psi | 84% | 2818 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 40,190 psi | 62% | 2575 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,421 psi | 61% | 2559 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,542 psi | 70% | 2638 fps | 100% |
| Hodgdon Retumbo | 75.5 gr | 82% | 33,127 psi | 51% | 2533 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 52,881 psi | 81% | 2835 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 43% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,921 psi | 74% | 2690 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,099 psi | 83% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,993 psi | 74% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,597 psi | 64% | 2575 fps | 96.2% |
| IMR 7828 SSC | 75.4 gr | 82% | 38,972 psi | 60% | 2608 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,898 psi | 57% | 2585 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,314 psi | 79% | 2723 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,719 psi | 77% | 2717 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,416 psi | 50% | 2385 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 48,472 psi | 75% | 2733 fps | 99% |
| Norma 217 | <<locked>> | 90% | 32,082 psi | 49% | 2487 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 40,147 psi | 62% | 2641 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 49,356 psi | 76% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,955 psi | 55% | 2549 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,414 psi | 75% | 2740 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,039 psi | 49% | 2428 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,821 psi | 78% | 2769 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,385 psi | 76% | 2792 fps | 100% |
| ReloadSwiss RS 76 | 78.8 gr | 80% | 29,950 psi | 46% | 2434 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 39,784 psi | 61% | 2657 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 43,308 psi | 67% | 2618 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 80% | 41,568 psi | 64% | 2618 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 80% | 52,576 psi | 81% | 2756 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,314 psi | 79% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,719 psi | 77% | 2717 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,372 psi | 78% | 2677 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,234 psi | 63% | 2615 fps | 97.8% |
| Somchem S361 | <<locked>> | 80% | 44,208 psi | 68% | 2602 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 46,717 psi | 72% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,959 psi | 65% | 2598 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 80% | 54,650 psi | 84% | 2717 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,850 psi | 78% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,434 psi | 56% | 2474 fps | 97% |
| Vihtavuori N170 | <<locked>> | 96% | 53,998 psi | 83% | 2802 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 50,169 psi | 77% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,901 psi | 63% | 2605 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,132 psi | 62% | 2635 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 37,913 psi | 58% | 2569 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 92% | 44,193 psi | 68% | 2736 fps | 96% |
| Vihtavuori N570 | <<locked>> | 96% | 48,530 psi | 75% | 2851 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,386 psi | 78% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,431 psi | 81% | 2805 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,562 psi | 52% | 2562 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,551 psi | 59% | 2526 fps | 97% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 182gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,035 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,035 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 182.0 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, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 182gr | CutEdge MTAC 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.