Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 145gr | CutEdge ESP Raptor bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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% | 55,216 psi | 85% | 3048 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 55,956 psi | 86% | 3094 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,436 psi | 90% | 3202 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 56,884 psi | 88% | 3068 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,464 psi | 88% | 3150 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 55,448 psi | 85% | 3146 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,792 psi | 77% | 3028 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,498 psi | 68% | 2979 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,189 psi | 90% | 3091 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,058 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,769 psi | 90% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,971 psi | 88% | 3136 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,434 psi | 85% | 3140 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,536 psi | 87% | 3120 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,492 psi | 87% | 3176 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,595 psi | 89% | 3205 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 58,262 psi | 90% | 3182 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,301 psi | 80% | 3100 fps | 98.1% |
| Bofors RP5 | <<locked>> | 94% | 55,434 psi | 85% | 3140 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 58,407 psi | 90% | 3104 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,216 psi | 85% | 3127 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 58,102 psi | 89% | 3153 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,840 psi | 87% | 3110 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 55,172 psi | 85% | 3084 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,044 psi | 89% | 3130 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,551 psi | 89% | 3077 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,201 psi | 85% | 3241 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 55,129 psi | 85% | 3120 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 2041 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,724 psi | 87% | 3081 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,231 psi | 87% | 3071 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 56,550 psi | 87% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,130 psi | 86% | 3071 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 96% | 57,130 psi | 88% | 3182 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,797 psi | 87% | 3068 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,711 psi | 90% | 3114 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,449 psi | 87% | 3068 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,073 psi | 89% | 3136 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 39,784 psi | 61% | 2890 fps | 96.8% |
| Norma MRP | <<locked>> | 92% | 55,303 psi | 85% | 3163 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 58,291 psi | 90% | 3133 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,247 psi | 90% | 3202 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 57,508 psi | 89% | 3136 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,116 psi | 88% | 3133 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 58% | 2087 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,044 psi | 89% | 3159 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,492 psi | 87% | 3114 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,984 psi | 85% | 3143 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,797 psi | 87% | 3238 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,517 psi | 79% | 3104 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 55,767 psi | 86% | 3048 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,450 psi | 90% | 3117 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 56,318 psi | 87% | 3123 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 58,407 psi | 90% | 3104 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,797 psi | 87% | 3068 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,711 psi | 90% | 3114 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,899 psi | 89% | 3110 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,695 psi | 86% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,275 psi | 87% | 3015 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,869 psi | 86% | 3117 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 55,550 psi | 85% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,695 psi | 87% | 3041 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 55,129 psi | 85% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,014 psi | 88% | 3094 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,942 psi | 88% | 3012 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,333 psi | 87% | 3071 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,666 psi | 87% | 3068 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,608 psi | 86% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,697 psi | 90% | 3146 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,085 psi | 85% | 3153 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 98% | 55,216 psi | 85% | 3127 fps | 98% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,431 psi | 81% | 3117 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,449 psi | 87% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,320 psi | 90% | 3156 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,810 psi | 84% | 3192 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,348 psi | 88% | 3091 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% | 33,388 psi | 51% | 2625 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 45,194 psi | 70% | 2917 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 50,314 psi | 77% | 3064 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 53,258 psi | 82% | 3015 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,553 psi | 62% | 2838 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 44,759 psi | 69% | 2946 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 96% | 43,178 psi | 66% | 2897 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 36,085 psi | 56% | 2779 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,520 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,395 psi | 67% | 2930 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,546 psi | 78% | 3051 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,509 psi | 62% | 2831 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,669 psi | 64% | 2884 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,126 psi | 49% | 2661 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,169 psi | 50% | 2674 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,491 psi | 55% | 2792 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 41,220 psi | 63% | 2871 fps | 95.6% |
| Bofors RP30 | <<locked>> | 94% | 41,974 psi | 65% | 2904 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 41,669 psi | 64% | 2884 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 47,877 psi | 74% | 2927 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 92% | 41,336 psi | 64% | 2858 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 47,152 psi | 73% | 2966 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 49,647 psi | 76% | 2989 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 47,848 psi | 74% | 2956 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,992 psi | 72% | 2940 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,785 psi | 63% | 2805 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,638 psi | 59% | 2890 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 47,094 psi | 72% | 2982 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 42% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,439 psi | 67% | 2848 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,385 psi | 76% | 2956 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 43,047 psi | 66% | 2858 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,122 psi | 71% | 2894 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 46,151 psi | 71% | 2986 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,847 psi | 72% | 2904 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 45,121 psi | 69% | 2884 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 32,634 psi | 50% | 2605 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 43,700 psi | 67% | 2884 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 36,999 psi | 57% | 2822 fps | 95.7% |
| Norma MRP | 82.2 gr | 82% | 37,956 psi | 58% | 2825 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 44,353 psi | 68% | 2904 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,830 psi | 66% | 2923 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 43,497 psi | 67% | 2894 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 38,247 psi | 59% | 2789 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 43% | 1877 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,838 psi | 83% | 3104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,310 psi | 70% | 2930 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,859 psi | 68% | 2949 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,665 psi | 55% | 2795 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,442 psi | 73% | 3028 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 52,098 psi | 80% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,846 psi | 69% | 2881 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 39,697 psi | 61% | 2812 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 47,877 psi | 74% | 2927 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,847 psi | 72% | 2904 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 45,121 psi | 69% | 2884 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,027 psi | 83% | 3054 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,286 psi | 80% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,876 psi | 71% | 2841 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,349 psi | 61% | 2802 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 51,982 psi | 80% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,050 psi | 71% | 2861 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 41,249 psi | 63% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,536 psi | 58% | 2730 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 49,792 psi | 77% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,934 psi | 71% | 2904 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 84% | 37,347 psi | 57% | 2713 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 45,281 psi | 70% | 2900 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 36,027 psi | 55% | 2740 fps | 98.5% |
| Vihtavuori N560 | 88.2 gr | 88% | 47,630 psi | 73% | 3018 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 44,483 psi | 68% | 2930 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 98% | 48,573 psi | 75% | 3045 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,397 psi | 70% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,326 psi | 73% | 2969 fps | 98.6% |
| Winchester StaBALL HD | 79.4 gr | 80% | 28,558 psi | 44% | 2648 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,856 psi | 61% | 2776 fps | 95.2% |
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 | CutEdge ESP Raptor. Hodgdon Retumbo delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 2,041 fps to 3,241 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 1:13.5 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, Vihtavuori N560, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 145gr | CutEdge ESP Raptor 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.