Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Norma ECO Strike bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 54,723 psi | 84% | 3002 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 55,564 psi | 86% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,957 psi | 89% | 3159 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 56,521 psi | 87% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,130 psi | 88% | 3107 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 55,027 psi | 85% | 3104 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,371 psi | 76% | 2986 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,150 psi | 68% | 2940 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,841 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,898 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,218 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,637 psi | 87% | 3094 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,984 psi | 85% | 3097 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,246 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,999 psi | 86% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,014 psi | 88% | 3159 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,145 psi | 88% | 3058 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 57,899 psi | 89% | 3140 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,851 psi | 80% | 3061 fps | 98.2% |
| Bofors RP5 | <<locked>> | 94% | 54,984 psi | 85% | 3097 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 58,204 psi | 90% | 3058 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,810 psi | 84% | 3084 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 57,638 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,449 psi | 87% | 3064 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 54,911 psi | 85% | 3041 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,638 psi | 89% | 3084 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,014 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,795 psi | 84% | 3199 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,621 psi | 84% | 3077 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 57% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,463 psi | 87% | 3038 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,999 psi | 86% | 3028 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 56,231 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,840 psi | 86% | 3031 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 56,710 psi | 87% | 3140 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,594 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,421 psi | 90% | 3071 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,711 psi | 89% | 3094 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 39,349 psi | 61% | 2848 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 54,897 psi | 84% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 57,972 psi | 89% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,725 psi | 89% | 3159 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 57,130 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,507 psi | 87% | 3087 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,536 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,841 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,057 psi | 86% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,621 psi | 84% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,188 psi | 86% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,908 psi | 78% | 3064 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 82% | 55,622 psi | 86% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,088 psi | 89% | 3074 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,956 psi | 86% | 3081 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 58,204 psi | 90% | 3058 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,594 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,421 psi | 90% | 3071 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,493 psi | 88% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,434 psi | 85% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,941 psi | 86% | 2972 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,521 psi | 85% | 3074 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 55,201 psi | 85% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,376 psi | 87% | 3002 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 58,624 psi | 90% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,507 psi | 87% | 3048 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,695 psi | 87% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,985 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,289 psi | 87% | 3028 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 55,361 psi | 85% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,117 psi | 89% | 3104 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,708 psi | 84% | 3114 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,784 psi | 90% | 3146 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 3068 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,159 psi | 86% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,841 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,186 psi | 83% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,739 psi | 87% | 3041 fps | 99.2% |
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% | 33,112 psi | 51% | 2585 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 44,802 psi | 69% | 2871 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 49,937 psi | 77% | 3022 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 53,040 psi | 82% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,292 psi | 62% | 2795 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 44,396 psi | 68% | 2907 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 96% | 42,859 psi | 66% | 2858 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 35,781 psi | 55% | 2740 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,244 psi | 83% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,149 psi | 66% | 2887 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,314 psi | 77% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,248 psi | 62% | 2789 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,479 psi | 59% | 2779 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,937 psi | 49% | 2625 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,879 psi | 49% | 2635 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,172 psi | 54% | 2756 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,548 psi | 82% | 2995 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 40,959 psi | 63% | 2831 fps | 95.7% |
| Bofors RP30 | <<locked>> | 94% | 41,568 psi | 64% | 2864 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 38,479 psi | 59% | 2779 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 47,674 psi | 73% | 2884 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 92% | 40,973 psi | 63% | 2818 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 46,876 psi | 72% | 2927 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,327 psi | 76% | 2943 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 47,674 psi | 73% | 2917 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,630 psi | 72% | 2897 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,567 psi | 62% | 2766 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,479 psi | 59% | 2854 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 46,847 psi | 72% | 2943 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 42% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,294 psi | 67% | 2808 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,211 psi | 76% | 2913 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 42,670 psi | 66% | 2815 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,861 psi | 71% | 2854 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 45,803 psi | 70% | 2946 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 46,630 psi | 72% | 2861 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,904 psi | 69% | 2844 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 32,460 psi | 50% | 2572 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 43,468 psi | 67% | 2844 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 36,709 psi | 56% | 2785 fps | 95.8% |
| Norma MRP | 78.2 gr | 80% | 34,969 psi | 54% | 2720 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 44,150 psi | 68% | 2864 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 42,525 psi | 65% | 2884 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 43,265 psi | 67% | 2854 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 38,000 psi | 58% | 2753 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 43% | 1841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,548 psi | 82% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,107 psi | 69% | 2890 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,497 psi | 67% | 2907 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,360 psi | 54% | 2756 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,007 psi | 72% | 2989 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 51,895 psi | 80% | 2953 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,585 psi | 69% | 2841 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 39,421 psi | 61% | 2772 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,674 psi | 73% | 2884 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,630 psi | 72% | 2861 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,904 psi | 69% | 2844 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,751 psi | 83% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,141 psi | 80% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,759 psi | 70% | 2802 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,088 psi | 60% | 2766 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 51,750 psi | 80% | 2949 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,745 psi | 70% | 2822 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 41,060 psi | 63% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,260 psi | 57% | 2690 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 49,603 psi | 76% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,614 psi | 70% | 2861 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,159 psi | 57% | 2677 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,165 psi | 70% | 2861 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,810 psi | 55% | 2703 fps | 98.7% |
| Vihtavuori N560 | 86 gr | 88% | 47,282 psi | 73% | 2979 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 44,121 psi | 68% | 2890 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 48,051 psi | 74% | 3002 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,078 psi | 69% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,050 psi | 72% | 2930 fps | 98.7% |
| Winchester StaBALL HD | 77.4 gr | 80% | 28,384 psi | 44% | 2615 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,566 psi | 61% | 2736 fps | 95.3% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Norma ECO Strike. Hodgdon Retumbo delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,199 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 150.0 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. Winchester StaBALL HD, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Norma ECO Strike 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.