Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Ferrobull Entox Sport 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, Winchester StaBALL HD 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>> | 94% | 57,798 psi | 89% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,537 psi | 90% | 3097 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,942 psi | 88% | 3150 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 58,682 psi | 90% | 3061 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,941 psi | 86% | 3094 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 58,015 psi | 89% | 3159 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,243 psi | 80% | 3045 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,818 psi | 72% | 3002 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,738 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,014 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,521 psi | 85% | 3084 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,073 psi | 89% | 3150 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,463 psi | 85% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,347 psi | 85% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,289 psi | 87% | 3150 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,883 psi | 86% | 3048 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 56,971 psi | 88% | 3130 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,187 psi | 85% | 3120 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 58,073 psi | 89% | 3150 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 56,637 psi | 87% | 3045 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 3140 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 56,478 psi | 87% | 3097 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,201 psi | 85% | 3051 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 57,609 psi | 89% | 3094 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,376 psi | 87% | 3074 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,927 psi | 86% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,204 psi | 90% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,754 psi | 89% | 3130 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,898 psi | 57% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,042 psi | 85% | 3025 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,320 psi | 90% | 3071 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,201 psi | 85% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,378 psi | 90% | 3081 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,840 psi | 86% | 3133 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 55,347 psi | 85% | 3015 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,203 psi | 88% | 3061 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,158 psi | 85% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,304 psi | 87% | 3081 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 42,337 psi | 65% | 2917 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 58,291 psi | 90% | 3173 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,855 psi | 88% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,913 psi | 88% | 3153 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 55,898 psi | 86% | 3081 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,709 psi | 86% | 3081 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 58% | 2067 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,998 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,754 psi | 89% | 3146 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,521 psi | 85% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,940 psi | 85% | 3130 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 57,972 psi | 89% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,029 psi | 88% | 3068 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 54,882 psi | 84% | 3071 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 56,637 psi | 87% | 3045 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,347 psi | 85% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,203 psi | 88% | 3061 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,435 psi | 88% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,378 psi | 90% | 3015 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,465 psi | 90% | 3127 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,638 psi | 89% | 3041 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,114 psi | 85% | 2992 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 57,740 psi | 89% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,521 psi | 85% | 3041 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,259 psi | 85% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,682 psi | 90% | 3071 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,303 psi | 85% | 3018 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 57,870 psi | 89% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,363 psi | 88% | 3094 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,943 psi | 89% | 3169 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 58,059 psi | 89% | 3143 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 3136 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,781 psi | 84% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,666 psi | 87% | 3097 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,494 psi | 90% | 3202 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,637 psi | 86% | 3035 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% | 34,998 psi | 54% | 2638 fps | 96.7% |
| Accurate 4350 | <<locked>> | 80% | 47,123 psi | 73% | 2917 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,600 psi | 70% | 2946 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 55,042 psi | 85% | 3009 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,363 psi | 61% | 2782 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 43,526 psi | 67% | 2897 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 94% | 42,192 psi | 65% | 2851 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 92% | 35,331 psi | 54% | 2733 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,295 psi | 70% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,026 psi | 82% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,378 psi | 61% | 2776 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,927 psi | 58% | 2769 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,736 psi | 52% | 2671 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,488 psi | 48% | 2628 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,652 psi | 58% | 2812 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,315 psi | 81% | 2989 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 40,437 psi | 62% | 2825 fps | 95.9% |
| Bofors RP30 | <<locked>> | 92% | 41,350 psi | 64% | 2861 fps | 95.6% |
| Bofors RP5 | <<locked>> | 82% | 37,927 psi | 58% | 2769 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 49,705 psi | 76% | 2930 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 40,306 psi | 62% | 2812 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 49,153 psi | 76% | 2976 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 51,547 psi | 79% | 2992 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,659 psi | 72% | 2907 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,672 psi | 70% | 2887 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,612 psi | 66% | 2808 fps | 100% |
| Hodgdon Retumbo | 86.4 gr | 88% | 37,884 psi | 58% | 2848 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 49,356 psi | 76% | 2992 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 42% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,179 psi | 70% | 2851 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,184 psi | 79% | 2959 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,817 psi | 69% | 2861 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,846 psi | 69% | 2841 fps | 95.5% |
| IMR 7828 SSC | 84.4 gr | 86% | 41,901 psi | 64% | 2871 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 48,501 psi | 75% | 2900 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,934 psi | 72% | 2890 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,981 psi | 49% | 2559 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 45,542 psi | 70% | 2894 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 36,492 psi | 56% | 2782 fps | 96% |
| Norma MRP | <<locked>> | 80% | 37,028 psi | 57% | 2776 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 46,354 psi | 71% | 2910 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,713 psi | 64% | 2874 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 45,397 psi | 70% | 2900 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 37,420 psi | 58% | 2743 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,079 psi | 43% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,558 psi | 73% | 2940 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,876 psi | 71% | 2956 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,824 psi | 54% | 2749 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,514 psi | 72% | 2986 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 54,244 psi | 83% | 2992 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,613 psi | 67% | 2828 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,609 psi | 59% | 2759 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 49,705 psi | 76% | 2930 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,501 psi | 75% | 2900 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,934 psi | 72% | 2890 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,998 psi | 83% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,601 psi | 73% | 2848 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,290 psi | 59% | 2753 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 53,824 psi | 83% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,628 psi | 69% | 2808 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 43,366 psi | 67% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,247 psi | 60% | 2740 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,764 psi | 80% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,747 psi | 73% | 2904 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,448 psi | 56% | 2664 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 47,166 psi | 73% | 2904 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,826 psi | 58% | 2753 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 46,586 psi | 72% | 2969 fps | 96% |
| Vihtavuori N565 | <<locked>> | 90% | 43,598 psi | 67% | 2881 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 47,674 psi | 73% | 2999 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,398 psi | 73% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,327 psi | 76% | 2976 fps | 99.3% |
| Winchester StaBALL HD | 80.7 gr | 80% | 30,095 psi | 46% | 2677 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,667 psi | 60% | 2720 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 79 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Ferrobull Entox Sport. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,258 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 150.0 gr projectile in 0.308" calls for a 1:12.5 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, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Ferrobull Entox Sport 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.