Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 130gr | Barnes X BT bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Alliant Reloder-26 and Winchester StaBALL HD.
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% | 57,827 psi | 89% | 3192 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 58,334 psi | 90% | 3241 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,869 psi | 86% | 3264 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 82% | 57,943 psi | 89% | 3199 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 58,508 psi | 90% | 3278 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 94% | 56,521 psi | 87% | 3268 fps | 97.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,300 psi | 79% | 3150 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,412 psi | 71% | 3110 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,001 psi | 89% | 3291 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,680 psi | 86% | 3248 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,189 psi | 90% | 3264 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,884 psi | 88% | 3274 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,986 psi | 89% | 3255 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3307 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,013 psi | 85% | 3284 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 55,854 psi | 86% | 3255 fps | 98.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,940 psi | 83% | 3235 fps | 97.6% |
| Bofors RP5 | <<locked>> | 94% | 56,884 psi | 88% | 3274 fps | 98.7% |
| Bofors RP7 | <<locked>> | 84% | 56,376 psi | 87% | 3179 fps | 99% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 3248 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,622 psi | 86% | 3222 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 84% | 57,943 psi | 89% | 3235 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 92% | 56,376 psi | 87% | 3205 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,216 psi | 85% | 3186 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,216 psi | 85% | 3156 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,521 psi | 87% | 3369 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 84% | 56,434 psi | 87% | 3251 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 57% | 2146 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,783 psi | 89% | 3205 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,363 psi | 88% | 3199 fps | 99.4% |
| IMR 4831 | <<locked>> | 88% | 58,349 psi | 90% | 3225 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,319 psi | 88% | 3192 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 96% | 58,291 psi | 90% | 3310 fps | 97.9% |
| Lovex S065 | <<locked>> | 86% | 58,566 psi | 90% | 3202 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 56,898 psi | 88% | 3192 fps | 99.5% |
| Lovex S071 | <<locked>> | 98% | 55,332 psi | 85% | 3153 fps | 99.7% |
| Norma 204 | <<locked>> | 86% | 55,303 psi | 85% | 3199 fps | 98% |
| Norma 217ᴾ | <<locked>> | 100% | 42,293 psi | 65% | 3038 fps | 96.7% |
| Norma MRP | <<locked>> | 92% | 57,000 psi | 88% | 3297 fps | 99.5% |
| Norma URP | <<locked>> | 86% | 56,086 psi | 86% | 3219 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,274 psi | 85% | 3258 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 86% | 54,984 psi | 85% | 3209 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 98% | 58,465 psi | 90% | 3258 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,898 psi | 58% | 2192 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,233 psi | 90% | 3251 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,188 psi | 86% | 3274 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,305 psi | 90% | 3369 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,432 psi | 82% | 3238 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 82% | 58,131 psi | 89% | 3196 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,014 psi | 86% | 3182 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 92% | 57,841 psi | 89% | 3255 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 84% | 56,376 psi | 87% | 3179 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,566 psi | 90% | 3202 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 56,898 psi | 88% | 3192 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,942 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,044 psi | 89% | 3146 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,392 psi | 88% | 3248 fps | 98.7% |
| Somchem S355 | <<locked>> | 82% | 57,363 psi | 88% | 3189 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,059 psi | 89% | 3163 fps | 97.1% |
| Somchem S365 | <<locked>> | 88% | 56,739 psi | 87% | 3222 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,624 psi | 90% | 3225 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 58,697 psi | 90% | 3153 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,769 psi | 89% | 3205 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,291 psi | 90% | 3196 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 86% | 57,290 psi | 88% | 3212 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,985 psi | 88% | 3238 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,579 psi | 87% | 3281 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 98% | 57,334 psi | 88% | 3264 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,638 psi | 89% | 3150 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,796 psi | 86% | 3225 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,246 psi | 87% | 3337 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,610 psi | 90% | 3215 fps | 98.8% |
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% | 36,579 psi | 56% | 2792 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 47,848 psi | 74% | 3068 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 52,011 psi | 80% | 3196 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 54,462 psi | 84% | 3146 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 44,904 psi | 69% | 3028 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 90% | 49,443 psi | 76% | 3140 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 98% | 48,022 psi | 74% | 3087 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 94% | 38,319 psi | 59% | 2920 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,686 psi | 69% | 3064 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,967 psi | 80% | 3192 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 45,034 psi | 69% | 3022 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 43,569 psi | 67% | 3025 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,447 psi | 53% | 2815 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 34,374 psi | 53% | 2822 fps | 95.7% |
| Alliant Reloder-26 | 83.7 gr | 80% | 37,942 psi | 58% | 2953 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 43,149 psi | 66% | 3012 fps | 95.2% |
| Bofors RP30 | <<locked>> | 96% | 47,268 psi | 73% | 3110 fps | 96% |
| Bofors RP5 | <<locked>> | 86% | 43,569 psi | 67% | 3025 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,690 psi | 76% | 3061 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 94% | 46,050 psi | 71% | 3051 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 48,747 psi | 75% | 3100 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 50,879 psi | 78% | 3117 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 88% | 49,414 psi | 76% | 3081 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 51,808 psi | 80% | 3127 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,583 psi | 66% | 2943 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 90% | 40,669 psi | 63% | 3028 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 48,559 psi | 75% | 3114 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 43% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,092 psi | 69% | 2979 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,633 psi | 78% | 3084 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 45,208 psi | 70% | 3005 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 50,604 psi | 78% | 3074 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 47,572 psi | 73% | 3114 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 48,863 psi | 75% | 3041 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 47,253 psi | 73% | 3025 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 35,868 psi | 55% | 2776 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 45,223 psi | 70% | 3012 fps | 95.6% |
| Norma 217 | <<locked>> | 98% | 39,508 psi | 61% | 2972 fps | 95.6% |
| Norma MRP | <<locked>> | 82% | 40,103 psi | 62% | 2976 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 46,238 psi | 71% | 3048 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 47,921 psi | 74% | 3123 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 45,165 psi | 70% | 3031 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 88% | 40,509 psi | 62% | 2930 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 44% | 1975 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,500 psi | 73% | 3077 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,455 psi | 70% | 3087 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 37,985 psi | 58% | 2943 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 49,545 psi | 76% | 3166 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 54,433 psi | 84% | 3143 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 49,255 psi | 76% | 3061 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 44,382 psi | 68% | 3009 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 49,690 psi | 76% | 3061 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,863 psi | 75% | 3041 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 47,253 psi | 73% | 3025 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,505 psi | 82% | 3015 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,906 psi | 74% | 2979 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 44,077 psi | 68% | 3005 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 53,954 psi | 83% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 51,024 psi | 79% | 3048 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 43,453 psi | 67% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,900 psi | 61% | 2877 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 51,648 psi | 79% | 3051 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,645 psi | 73% | 3038 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 42,018 psi | 65% | 2907 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 47,413 psi | 73% | 3045 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 38,841 psi | 60% | 2907 fps | 98.6% |
| Vihtavuori N560 | 89.4 gr | 88% | 49,269 psi | 76% | 3150 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 50,125 psi | 77% | 3136 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,891 psi | 72% | 2989 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,921 psi | 75% | 3104 fps | 98.2% |
| Winchester StaBALL HD | 80.4 gr | 80% | 31,140 psi | 48% | 2822 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 44,628 psi | 69% | 2969 fps | 95.8% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 130gr | Barnes X BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,369 fps; across all powders the maximum-charge window runs from 2,146 fps to 3,369 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 130.0 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, 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. Vihtavuori N560, Alliant Reloder-26, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 130gr | Barnes X BT 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.