Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Sako Powerhead Blade 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>> | 96% | 58,639 psi | 90% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,593 psi | 86% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,812 psi | 89% | 3159 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 56,536 psi | 87% | 3022 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,956 psi | 88% | 3107 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 54,882 psi | 84% | 3104 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,226 psi | 76% | 2982 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,990 psi | 68% | 2940 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,217 psi | 88% | 3104 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,870 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,695 psi | 87% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,073 psi | 89% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,507 psi | 87% | 3091 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,824 psi | 84% | 3097 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,072 psi | 86% | 3074 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,855 psi | 88% | 3159 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,754 psi | 89% | 3140 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,474 psi | 79% | 3054 fps | 98.1% |
| Bofors RP5 | <<locked>> | 94% | 54,824 psi | 84% | 3097 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 58,030 psi | 89% | 3054 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,694 psi | 84% | 3084 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 57,667 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,304 psi | 87% | 3061 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 54,766 psi | 84% | 3041 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,493 psi | 88% | 3081 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,043 psi | 88% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,621 psi | 84% | 3196 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 54,462 psi | 84% | 3074 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 57% | 2001 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,304 psi | 87% | 3035 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,043 psi | 86% | 3028 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 56,057 psi | 86% | 3041 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,695 psi | 86% | 3025 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 56,565 psi | 87% | 3140 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,420 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,247 psi | 90% | 3068 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,825 psi | 86% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,551 psi | 89% | 3091 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 39,218 psi | 60% | 2848 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 54,694 psi | 84% | 3117 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 57,783 psi | 89% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,522 psi | 89% | 3156 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,971 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,376 psi | 87% | 3087 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,624 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,912 psi | 86% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,726 psi | 90% | 3159 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,072 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,778 psi | 78% | 3061 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 55,419 psi | 85% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,160 psi | 90% | 3074 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,796 psi | 86% | 3077 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 58,030 psi | 89% | 3054 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,420 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,247 psi | 90% | 3068 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,305 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,477 psi | 85% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,825 psi | 86% | 2972 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,361 psi | 85% | 3074 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 55,201 psi | 85% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,246 psi | 87% | 3002 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 58,450 psi | 90% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,347 psi | 87% | 3048 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,507 psi | 87% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,999 psi | 86% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,144 psi | 86% | 3025 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,187 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,943 psi | 89% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,726 psi | 90% | 3176 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3143 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,576 psi | 79% | 3068 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,999 psi | 86% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,667 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 58,682 psi | 90% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,594 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% | 2589 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 44,802 psi | 69% | 2874 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 49,734 psi | 77% | 3018 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 53,040 psi | 82% | 2969 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,147 psi | 62% | 2795 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 44,251 psi | 68% | 2904 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 42,743 psi | 66% | 2851 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 35,665 psi | 55% | 2736 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,495 psi | 62% | 2795 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,085 psi | 83% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,989 psi | 66% | 2884 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,111 psi | 77% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,118 psi | 62% | 2785 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,234 psi | 63% | 2844 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,792 psi | 49% | 2621 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,879 psi | 49% | 2638 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,172 psi | 54% | 2756 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 40,799 psi | 63% | 2831 fps | 95.7% |
| Bofors RP30 | <<locked>> | 94% | 41,423 psi | 64% | 2864 fps | 95.3% |
| Bofors RP5 | <<locked>> | 86% | 41,234 psi | 63% | 2844 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 47,703 psi | 73% | 2887 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 92% | 40,843 psi | 63% | 2815 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 46,688 psi | 72% | 2923 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,342 psi | 76% | 2946 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 47,529 psi | 73% | 2913 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,485 psi | 72% | 2897 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,408 psi | 62% | 2762 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,348 psi | 59% | 2851 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 46,717 psi | 72% | 2943 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 42% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,134 psi | 66% | 2805 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,240 psi | 76% | 2917 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 42,699 psi | 66% | 2818 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,716 psi | 70% | 2851 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 45,658 psi | 70% | 2943 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 46,485 psi | 72% | 2858 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,773 psi | 69% | 2841 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 32,314 psi | 50% | 2569 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 43,308 psi | 67% | 2841 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 36,579 psi | 56% | 2782 fps | 95.7% |
| Norma MRP | 78 gr | 80% | 34,838 psi | 54% | 2717 fps | 95% |
| Norma URP | <<locked>> | 80% | 43,990 psi | 68% | 2861 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,380 psi | 65% | 2881 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 43,091 psi | 66% | 2851 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 37,869 psi | 58% | 2749 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 43% | 1841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,359 psi | 82% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,933 psi | 69% | 2890 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,352 psi | 67% | 2904 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,230 psi | 54% | 2756 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,702 psi | 72% | 2986 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 51,692 psi | 80% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,469 psi | 68% | 2838 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 39,262 psi | 60% | 2769 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 47,703 psi | 73% | 2887 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,485 psi | 72% | 2858 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,773 psi | 69% | 2841 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,563 psi | 82% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,996 psi | 80% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,571 psi | 70% | 2802 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,957 psi | 60% | 2762 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 51,576 psi | 79% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,614 psi | 70% | 2818 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 40,872 psi | 63% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,260 psi | 57% | 2690 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 49,429 psi | 76% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,614 psi | 70% | 2861 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,014 psi | 57% | 2674 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 44,991 psi | 69% | 2858 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,665 psi | 55% | 2703 fps | 98.6% |
| Vihtavuori N560 | 85.8 gr | 88% | 47,123 psi | 73% | 2976 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 43,932 psi | 68% | 2887 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 98% | 47,921 psi | 74% | 3002 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,933 psi | 69% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,862 psi | 72% | 2927 fps | 98.7% |
| Winchester StaBALL HD | 77.2 gr | 80% | 28,253 psi | 43% | 2612 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,421 psi | 61% | 2733 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 | Sako Powerhead Blade. Winchester StaBALL HD delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,209 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 1:11.0 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 | Sako Powerhead Blade 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.