Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 155gr | 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 Vihtavuori N560, Ramshot Grand and Accurate MAGPRO.
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% | 56,521 psi | 87% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,159 psi | 88% | 3035 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,419 psi | 85% | 3084 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 57,783 psi | 89% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 58,653 psi | 90% | 3094 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 56,608 psi | 87% | 3094 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,966 psi | 78% | 2982 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,498 psi | 70% | 2933 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,508 psi | 90% | 3097 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,854 psi | 86% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,131 psi | 89% | 3081 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,608 psi | 87% | 3087 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,928 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,752 psi | 84% | 3087 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 58,566 psi | 90% | 3048 fps | 96.6% |
| Bofors RP15 | <<locked>> | 96% | 55,767 psi | 86% | 3074 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 3051 fps | 98.7% |
| Bofors RP5 | <<locked>> | 94% | 56,608 psi | 87% | 3087 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 55,695 psi | 86% | 2986 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,405 psi | 87% | 3074 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,288 psi | 85% | 3031 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 57,827 psi | 89% | 3048 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,420 psi | 87% | 3031 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,158 psi | 85% | 3012 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 58,566 psi | 90% | 3012 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3192 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,188 psi | 86% | 3064 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 57% | 1975 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,812 psi | 89% | 3022 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,261 psi | 88% | 3009 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 57,740 psi | 89% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,145 psi | 88% | 3015 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 58,436 psi | 90% | 3130 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 57,928 psi | 89% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,159 psi | 86% | 2999 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,595 psi | 89% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,259 psi | 85% | 3018 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 40,988 psi | 63% | 2854 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 56,579 psi | 87% | 3107 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 55,753 psi | 86% | 3018 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,216 psi | 85% | 3087 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 58,639 psi | 90% | 3074 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 58,392 psi | 90% | 3081 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,682 psi | 89% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,260 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 3192 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,982 psi | 82% | 3064 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 56,869 psi | 88% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,840 psi | 86% | 3002 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 57,493 psi | 88% | 3068 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 55,695 psi | 86% | 2986 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,928 psi | 89% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,159 psi | 86% | 2999 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,666 psi | 87% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,246 psi | 88% | 2956 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,058 psi | 88% | 3061 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 56,565 psi | 87% | 2979 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,725 psi | 89% | 2989 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 56,434 psi | 87% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,001 psi | 89% | 3035 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 58,059 psi | 89% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,435 psi | 88% | 3009 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,812 psi | 89% | 3015 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 56,768 psi | 87% | 3012 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,014 psi | 86% | 3035 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,304 psi | 87% | 3100 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 56,449 psi | 87% | 3077 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,679 psi | 83% | 3071 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,580 psi | 89% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,477 psi | 85% | 3035 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,550 psi | 87% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,508 psi | 90% | 3035 fps | 99.5% |
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% | 34,214 psi | 53% | 2582 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 46,209 psi | 71% | 2861 fps | 99.9% |
| Accurate MAGPRO | 87.9 gr | 88% | 47,776 psi | 74% | 2949 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 54,244 psi | 83% | 2949 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,595 psi | 59% | 2726 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 86% | 42,525 psi | 65% | 2835 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 94% | 41,191 psi | 63% | 2789 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 92% | 34,548 psi | 53% | 2677 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,280 psi | 68% | 2871 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,793 psi | 80% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,624 psi | 59% | 2720 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,726 psi | 61% | 2776 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,025 psi | 51% | 2618 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,748 psi | 47% | 2575 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,506 psi | 56% | 2753 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,868 psi | 84% | 2989 fps | 95.8% |
| Bofors RP15 | <<locked>> | 86% | 39,494 psi | 61% | 2769 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 40,147 psi | 62% | 2799 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 39,726 psi | 61% | 2776 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,863 psi | 75% | 2871 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 39,262 psi | 60% | 2749 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 48,196 psi | 74% | 2917 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 50,589 psi | 78% | 2933 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 45,658 psi | 70% | 2844 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,643 psi | 69% | 2828 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,800 psi | 64% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,999 psi | 57% | 2785 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,298 psi | 74% | 2933 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 42% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,396 psi | 68% | 2795 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,372 psi | 78% | 2900 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 43,947 psi | 68% | 2805 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,947 psi | 68% | 2782 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 88% | 43,932 psi | 68% | 2874 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 47,776 psi | 74% | 2848 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,093 psi | 71% | 2831 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,285 psi | 48% | 2510 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 44,686 psi | 69% | 2831 fps | 97% |
| Norma 217 | <<locked>> | 96% | 35,462 psi | 55% | 2723 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,172 psi | 56% | 2720 fps | 96% |
| Norma URP | <<locked>> | 80% | 45,440 psi | 70% | 2851 fps | 99.9% |
| Ramshot Grand | 83.7 gr | 86% | 40,770 psi | 63% | 2815 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 44,498 psi | 68% | 2844 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 36,303 psi | 56% | 2684 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,050 psi | 43% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,485 psi | 72% | 2881 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,846 psi | 69% | 2897 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,866 psi | 52% | 2687 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 44,976 psi | 69% | 2917 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 53,258 psi | 82% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,728 psi | 66% | 2769 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 37,811 psi | 58% | 2700 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,863 psi | 75% | 2871 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,776 psi | 74% | 2848 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,093 psi | 71% | 2831 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,142 psi | 82% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,847 psi | 72% | 2789 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,478 psi | 58% | 2697 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,069 psi | 82% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,743 psi | 67% | 2749 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,409 psi | 65% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,392 psi | 59% | 2684 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 50,865 psi | 78% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,862 psi | 72% | 2848 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 35,650 psi | 55% | 2612 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 46,238 psi | 71% | 2848 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,912 psi | 57% | 2697 fps | 99.1% |
| Vihtavuori N560 | 84.4 gr | 86% | 45,411 psi | 70% | 2907 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 90% | 42,409 psi | 65% | 2822 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 49,690 psi | 76% | 2999 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,325 psi | 71% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,196 psi | 74% | 2917 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,356 psi | 45% | 2618 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,782 psi | 58% | 2664 fps | 95.1% |
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 79 powders for .300 Rem. Ultra Mag. loaded with the .308 | 155gr | CutEdge MTAC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,192 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,192 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 155.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Vihtavuori N560, Ramshot Grand, Accurate MAGPRO rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 155gr | CutEdge MTAC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.