Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 139gr | Prvi Partizan FMJ 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% | 55,825 psi | 86% | 3100 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 56,463 psi | 87% | 3150 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,668 psi | 90% | 3248 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 56,985 psi | 88% | 3120 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,522 psi | 89% | 3196 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 55,651 psi | 86% | 3192 fps | 97.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,038 psi | 77% | 3071 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,860 psi | 69% | 3025 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,392 psi | 90% | 3140 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,188 psi | 88% | 3205 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,621 psi | 84% | 3163 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,043 psi | 88% | 3182 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,753 psi | 86% | 3189 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,884 psi | 88% | 3166 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 3222 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,841 psi | 89% | 3255 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 58,494 psi | 90% | 3232 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 3146 fps | 97.9% |
| Bofors RP5 | <<locked>> | 94% | 55,753 psi | 86% | 3189 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 58,726 psi | 90% | 3150 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,361 psi | 85% | 3169 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 86% | 58,291 psi | 90% | 3199 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 57,029 psi | 88% | 3156 fps | 99% |
| Hodgdon H4831 | <<locked>> | 92% | 55,463 psi | 85% | 3130 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,291 psi | 90% | 3173 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,551 psi | 89% | 3123 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,361 psi | 85% | 3287 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 84% | 55,230 psi | 85% | 3166 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 57% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,869 psi | 88% | 3127 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,463 psi | 87% | 3117 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 56,884 psi | 88% | 3136 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,231 psi | 87% | 3114 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 96% | 57,276 psi | 88% | 3228 fps | 98.2% |
| Lovex S065 | <<locked>> | 86% | 57,188 psi | 88% | 3117 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,405 psi | 85% | 3107 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3114 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 58,146 psi | 89% | 3182 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 40,292 psi | 62% | 2940 fps | 96.6% |
| Norma MRP | <<locked>> | 92% | 55,608 psi | 86% | 3209 fps | 99.6% |
| Norma URP | <<locked>> | 88% | 58,566 psi | 90% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,334 psi | 90% | 3248 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 57,653 psi | 89% | 3182 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 57,203 psi | 88% | 3176 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,594 psi | 58% | 2126 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,146 psi | 89% | 3212 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,782 psi | 87% | 3166 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,071 psi | 85% | 3189 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,072 psi | 88% | 3287 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,880 psi | 80% | 3153 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 56,333 psi | 87% | 3104 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,740 psi | 90% | 3163 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 56,492 psi | 87% | 3169 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 58,726 psi | 90% | 3150 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,188 psi | 88% | 3117 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,405 psi | 85% | 3107 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,943 psi | 89% | 3159 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,883 psi | 86% | 2979 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,652 psi | 87% | 3064 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,057 psi | 86% | 3163 fps | 98.9% |
| Somchem S355 | <<locked>> | 82% | 55,854 psi | 86% | 3097 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,029 psi | 88% | 3091 fps | 97.5% |
| Somchem S365 | <<locked>> | 88% | 55,419 psi | 85% | 3130 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,232 psi | 88% | 3140 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 57,348 psi | 88% | 3064 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,608 psi | 87% | 3120 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,971 psi | 88% | 3114 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 55,956 psi | 86% | 3123 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,245 psi | 85% | 3143 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,361 psi | 85% | 3199 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 98% | 55,593 psi | 86% | 3173 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,739 psi | 87% | 3071 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,508 psi | 90% | 3205 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,969 psi | 85% | 3241 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,392 psi | 88% | 3130 fps | 99% |
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% | 34,098 psi | 52% | 2677 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 45,716 psi | 70% | 2969 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 50,691 psi | 78% | 3110 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,447 psi | 82% | 3064 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,656 psi | 67% | 2943 fps | 96% |
| ADI AR 2213 | <<locked>> | 88% | 45,049 psi | 69% | 2992 fps | 95% |
| ADI AR 2217 | <<locked>> | 98% | 46,702 psi | 72% | 3005 fps | 96% |
| ADI AR 2225 | <<locked>> | 94% | 36,637 psi | 56% | 2825 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,766 psi | 84% | 3087 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,627 psi | 67% | 2976 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,850 psi | 78% | 3104 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,756 psi | 63% | 2874 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,061 psi | 65% | 2930 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,590 psi | 50% | 2710 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,605 psi | 50% | 2720 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,027 psi | 55% | 2844 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 41,655 psi | 64% | 2920 fps | 95.4% |
| Bofors RP30 | <<locked>> | 94% | 42,467 psi | 65% | 2953 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 42,061 psi | 65% | 2930 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,399 psi | 74% | 2979 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 44,759 psi | 69% | 2969 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 47,355 psi | 73% | 3015 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 49,792 psi | 77% | 3035 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 88% | 48,109 psi | 74% | 2999 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,210 psi | 73% | 2982 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,147 psi | 63% | 2854 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,160 psi | 60% | 2936 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,355 psi | 73% | 3028 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 42% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,859 psi | 68% | 2894 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,734 psi | 77% | 3005 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 43,453 psi | 67% | 2910 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,412 psi | 71% | 2936 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 46,398 psi | 71% | 3031 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,253 psi | 73% | 2953 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 45,513 psi | 70% | 2933 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 33,330 psi | 51% | 2657 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 43,918 psi | 68% | 2927 fps | 95.9% |
| Norma 217 | <<locked>> | 98% | 37,565 psi | 58% | 2871 fps | 95.5% |
| Norma MRP | 83 gr | 82% | 38,435 psi | 59% | 2877 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 44,686 psi | 69% | 2953 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 46,499 psi | 72% | 3038 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 43,758 psi | 67% | 2940 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 88% | 38,769 psi | 60% | 2835 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 43% | 1916 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,027 psi | 83% | 3156 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,803 psi | 70% | 2982 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,005 psi | 68% | 2995 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,100 psi | 56% | 2841 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,892 psi | 74% | 3077 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 52,562 psi | 81% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,034 psi | 69% | 2923 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 42,888 psi | 66% | 2920 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 48,399 psi | 74% | 2979 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,253 psi | 73% | 2953 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 45,513 psi | 70% | 2933 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,128 psi | 83% | 3100 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,533 psi | 81% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,441 psi | 71% | 2894 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,525 psi | 65% | 2913 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 52,359 psi | 81% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,603 psi | 76% | 2966 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 41,756 psi | 64% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,014 psi | 59% | 2779 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 50,125 psi | 77% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,209 psi | 71% | 2949 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 40,466 psi | 62% | 2822 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,788 psi | 70% | 2953 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 36,637 psi | 56% | 2795 fps | 98.4% |
| Vihtavuori N560 | 89.1 gr | 88% | 48,008 psi | 74% | 3064 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 92% | 45,078 psi | 69% | 2979 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,701 psi | 70% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,529 psi | 73% | 3018 fps | 98.4% |
| Winchester StaBALL HD | 80.1 gr | 80% | 29,095 psi | 45% | 2700 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,163 psi | 66% | 2884 fps | 96% |
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 | 139gr | Prvi Partizan FMJ. Hodgdon Retumbo delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,287 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 139.0 gr projectile in 0.308" calls for a 1:14.5 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, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 139gr | Prvi Partizan FMJ 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.