Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 145gr | SUS-TAC HPT bullet and 75 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% | 55,201 psi | 85% | 3045 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 56,057 psi | 86% | 3094 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,073 psi | 89% | 3192 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 56,739 psi | 87% | 3061 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,246 psi | 88% | 3143 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 55,114 psi | 85% | 3140 fps | 97.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,705 psi | 76% | 3022 fps | 97.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,382 psi | 68% | 2976 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,218 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,782 psi | 87% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,378 psi | 90% | 3166 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,782 psi | 87% | 3130 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,201 psi | 85% | 3136 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,434 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 3169 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,377 psi | 88% | 3202 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,986 psi | 89% | 3176 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,025 psi | 80% | 3097 fps | 97.9% |
| Bofors RP5 | <<locked>> | 94% | 55,201 psi | 85% | 3136 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 58,305 psi | 90% | 3094 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 3117 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 86% | 57,812 psi | 89% | 3146 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,623 psi | 87% | 3104 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 92% | 55,042 psi | 85% | 3077 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,725 psi | 89% | 3120 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,232 psi | 88% | 3068 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,839 psi | 84% | 3235 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 84% | 54,781 psi | 84% | 3114 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 2034 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,637 psi | 87% | 3077 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,202 psi | 86% | 3064 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 56,608 psi | 87% | 3084 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,956 psi | 86% | 3064 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 56,768 psi | 87% | 3173 fps | 98.3% |
| Lovex S065 | <<locked>> | 86% | 56,956 psi | 88% | 3064 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,755 psi | 90% | 3110 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 3061 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,841 psi | 89% | 3130 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 39,943 psi | 61% | 2894 fps | 96.8% |
| Norma MRP | <<locked>> | 92% | 55,056 psi | 85% | 3156 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 58,189 psi | 90% | 3130 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,899 psi | 89% | 3196 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 57,276 psi | 88% | 3130 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,507 psi | 87% | 3123 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 58% | 2080 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,769 psi | 89% | 3156 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,362 psi | 87% | 3110 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,737 psi | 84% | 3140 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,420 psi | 87% | 3235 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,271 psi | 79% | 3100 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 55,956 psi | 86% | 3048 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,218 psi | 90% | 3110 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 56,144 psi | 86% | 3117 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 58,305 psi | 90% | 3094 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,956 psi | 88% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,755 psi | 90% | 3110 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,696 psi | 89% | 3104 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,767 psi | 86% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,318 psi | 87% | 3012 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,695 psi | 86% | 3110 fps | 98.9% |
| Somchem S355 | <<locked>> | 82% | 55,651 psi | 86% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,550 psi | 87% | 3038 fps | 97.5% |
| Somchem S365 | <<locked>> | 88% | 55,085 psi | 85% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,840 psi | 87% | 3087 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 57,072 psi | 88% | 3012 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,246 psi | 87% | 3068 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,449 psi | 87% | 3061 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 55,695 psi | 86% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,508 psi | 90% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,810 psi | 84% | 3146 fps | 97.5% |
| Vihtavuori N565 | <<locked>> | 98% | 55,042 psi | 85% | 3123 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,275 psi | 87% | 3018 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,073 psi | 89% | 3150 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,433 psi | 84% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,101 psi | 88% | 3084 fps | 99.1% |
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% | 33,881 psi | 52% | 2635 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 45,469 psi | 70% | 2920 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 50,154 psi | 77% | 3061 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 53,301 psi | 82% | 3012 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,524 psi | 62% | 2831 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 44,672 psi | 69% | 2943 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 43,149 psi | 66% | 2890 fps | 95% |
| ADI AR 2225 | <<locked>> | 94% | 36,201 psi | 56% | 2776 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,476 psi | 84% | 3031 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,323 psi | 67% | 2923 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,546 psi | 78% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,640 psi | 63% | 2828 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,742 psi | 64% | 2884 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,343 psi | 50% | 2667 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,387 psi | 50% | 2680 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,723 psi | 55% | 2799 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 41,336 psi | 64% | 2871 fps | 95.5% |
| Bofors RP30 | <<locked>> | 94% | 41,945 psi | 65% | 2904 fps | 95.1% |
| Bofors RP5 | <<locked>> | 86% | 41,742 psi | 64% | 2884 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,138 psi | 74% | 2927 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 92% | 41,292 psi | 64% | 2854 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 47,079 psi | 72% | 2966 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 49,632 psi | 76% | 2982 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 47,747 psi | 73% | 2949 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,876 psi | 72% | 2933 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,872 psi | 63% | 2802 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,754 psi | 60% | 2887 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 47,094 psi | 72% | 2982 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 42% | 1831 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,656 psi | 67% | 2848 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,487 psi | 76% | 2953 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 43,221 psi | 67% | 2861 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,151 psi | 71% | 2890 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 46,064 psi | 71% | 2982 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 46,978 psi | 72% | 2900 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 45,440 psi | 70% | 2884 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 33,170 psi | 51% | 2618 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 43,642 psi | 67% | 2877 fps | 96% |
| Norma 217 | <<locked>> | 98% | 37,188 psi | 57% | 2828 fps | 95.6% |
| Norma MRP | 80.5 gr | 82% | 38,101 psi | 59% | 2828 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 44,599 psi | 69% | 2907 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,844 psi | 66% | 2920 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,468 psi | 67% | 2890 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 38,435 psi | 59% | 2792 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 43% | 1873 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,722 psi | 83% | 3100 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,556 psi | 70% | 2933 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,830 psi | 67% | 2946 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,810 psi | 55% | 2795 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,239 psi | 73% | 3028 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 52,475 psi | 81% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,788 psi | 69% | 2874 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 39,871 psi | 61% | 2812 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,138 psi | 74% | 2927 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,978 psi | 72% | 2900 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 45,440 psi | 70% | 2884 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,809 psi | 83% | 3048 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,315 psi | 81% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,035 psi | 71% | 2841 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,523 psi | 61% | 2805 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 52,069 psi | 80% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,093 psi | 71% | 2858 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 41,510 psi | 64% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,840 psi | 58% | 2733 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 50,038 psi | 77% | 2910 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,006 psi | 71% | 2900 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 40,190 psi | 62% | 2772 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 45,455 psi | 70% | 2900 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 36,361 psi | 56% | 2749 fps | 98.6% |
| Vihtavuori N560 | 86.4 gr | 88% | 47,558 psi | 73% | 3015 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 44,527 psi | 69% | 2930 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,382 psi | 70% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,253 psi | 73% | 2966 fps | 98.6% |
| Winchester StaBALL HD | 77.7 gr | 80% | 28,877 psi | 44% | 2657 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,842 psi | 61% | 2772 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 82 powders for .300 Rem. Ultra Mag. loaded with the .308 | 145gr | SUS-TAC HPT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,034 fps to 3,235 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 145.0 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 | 145gr | SUS-TAC HPT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 Enduron 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.