Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Berger Target FB bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Hodgdon Retumbo.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 94% | 58,320 psi | 90% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,042 psi | 85% | 3038 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,261 psi | 88% | 3146 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 90% | 56,101 psi | 86% | 3091 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 58,117 psi | 89% | 3153 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,359 psi | 81% | 3038 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,065 psi | 72% | 2995 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,420 psi | 87% | 3087 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,767 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,116 psi | 88% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,753 psi | 86% | 3077 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,233 psi | 90% | 3146 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,593 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,317 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,376 psi | 87% | 3146 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,912 psi | 86% | 3041 fps | 95.9% |
| Bofors RP15 | <<locked>> | 96% | 57,174 psi | 88% | 3127 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3114 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 58,233 psi | 90% | 3146 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 56,971 psi | 88% | 3038 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 3133 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 56,695 psi | 87% | 3091 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,288 psi | 85% | 3045 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 57,696 psi | 89% | 3084 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,492 psi | 87% | 3068 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,304 psi | 87% | 3015 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3251 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,841 psi | 89% | 3123 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 57% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,376 psi | 85% | 3022 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,334 psi | 90% | 3064 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,477 psi | 85% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,407 psi | 90% | 3071 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 55,941 psi | 86% | 3127 fps | 98.5% |
| Lovex S065 | <<locked>> | 84% | 55,579 psi | 86% | 3009 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,479 psi | 88% | 3054 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,637 psi | 86% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,521 psi | 87% | 3074 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 42,656 psi | 66% | 2917 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 58,276 psi | 90% | 3166 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,058 psi | 88% | 3074 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,826 psi | 87% | 3143 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 56,159 psi | 86% | 3074 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,593 psi | 86% | 3071 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 58% | 2057 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,172 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,783 psi | 89% | 3143 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,521 psi | 85% | 3182 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 3123 fps | 97.7% |
| Rottweil R 903 | <<locked>> | 82% | 58,450 psi | 90% | 3041 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,029 psi | 88% | 3054 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 90% | 55,172 psi | 85% | 3064 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,971 psi | 88% | 3038 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,579 psi | 86% | 3009 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,479 psi | 88% | 3054 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,812 psi | 89% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,682 psi | 90% | 3012 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,566 psi | 90% | 3120 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 57,812 psi | 89% | 3035 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,158 psi | 85% | 2982 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 58,015 psi | 89% | 3074 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,796 psi | 86% | 3035 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 55,637 psi | 86% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,129 psi | 85% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,521 psi | 85% | 3012 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 58,189 psi | 90% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,638 psi | 89% | 3091 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,899 psi | 89% | 3159 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 58,320 psi | 90% | 3136 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,550 psi | 85% | 3133 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,853 psi | 84% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,913 psi | 88% | 3094 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,508 psi | 90% | 3196 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,840 psi | 86% | 3028 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% | 35,737 psi | 55% | 2644 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 47,747 psi | 73% | 2920 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 49,472 psi | 76% | 3012 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 39,697 psi | 61% | 2782 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 43,801 psi | 67% | 2890 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 94% | 42,482 psi | 65% | 2848 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 33,475 psi | 52% | 2671 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,132 psi | 62% | 2782 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,498 psi | 70% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,171 psi | 82% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,755 psi | 61% | 2776 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,305 psi | 59% | 2769 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,330 psi | 53% | 2680 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,908 psi | 49% | 2631 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,116 psi | 59% | 2818 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,533 psi | 81% | 2982 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 40,814 psi | 63% | 2825 fps | 95.8% |
| Bofors RP30 | <<locked>> | 92% | 41,713 psi | 64% | 2861 fps | 95.6% |
| Bofors RP5 | <<locked>> | 82% | 38,305 psi | 59% | 2769 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 50,038 psi | 77% | 2927 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 90% | 40,596 psi | 62% | 2808 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 49,356 psi | 76% | 2969 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 51,793 psi | 80% | 2989 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 46,789 psi | 72% | 2897 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,934 psi | 71% | 2881 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,946 psi | 66% | 2805 fps | 100% |
| Hodgdon Retumbo | 85.1 gr | 88% | 38,290 psi | 59% | 2848 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,617 psi | 76% | 2989 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,484 psi | 70% | 2848 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,387 psi | 79% | 2953 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 45,295 psi | 70% | 2861 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,034 psi | 69% | 2835 fps | 95.4% |
| IMR 7828 SSC | 85 gr | 88% | 45,237 psi | 70% | 2930 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 49,066 psi | 76% | 2900 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,384 psi | 73% | 2887 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 32,866 psi | 51% | 2575 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 45,774 psi | 70% | 2887 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 37,014 psi | 57% | 2785 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 37,550 psi | 58% | 2779 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 46,717 psi | 72% | 2907 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,090 psi | 65% | 2874 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 45,614 psi | 70% | 2897 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 37,797 psi | 58% | 2743 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,906 psi | 74% | 2940 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,267 psi | 71% | 2956 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,259 psi | 54% | 2753 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,688 psi | 72% | 2979 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 54,723 psi | 84% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,772 psi | 67% | 2822 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 39,044 psi | 60% | 2759 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 50,038 psi | 77% | 2927 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,066 psi | 76% | 2900 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 47,384 psi | 73% | 2887 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,317 psi | 84% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,066 psi | 74% | 2844 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,711 psi | 60% | 2753 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 54,389 psi | 84% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,005 psi | 69% | 2805 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,816 psi | 67% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,813 psi | 61% | 2746 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 52,083 psi | 80% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,080 psi | 74% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,941 psi | 57% | 2667 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 47,616 psi | 73% | 2904 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,450 psi | 59% | 2759 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 46,746 psi | 72% | 2963 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 90% | 44,034 psi | 68% | 2884 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 47,747 psi | 73% | 2992 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,645 psi | 73% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,530 psi | 76% | 2972 fps | 99.2% |
| Winchester StaBALL HD | 79.4 gr | 80% | 30,632 psi | 47% | 2684 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,160 psi | 60% | 2723 fps | 95.4% |
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 | 150gr | Berger Target FB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,251 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 150.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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, IMR 7828 SSC, Hodgdon Retumbo rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Berger Target FB 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.