Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 139gr | IBEX TRD bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 92% | 55,898 psi | 86% | 3091 fps | 99.9% |
| Accurate 4350 | <<locked>> | 84% | 56,405 psi | 87% | 3136 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,609 psi | 89% | 3225 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 90% | 56,391 psi | 87% | 3169 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 94% | 58,262 psi | 90% | 3228 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,823 psi | 81% | 3114 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,877 psi | 74% | 3081 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,999 psi | 86% | 3182 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,508 psi | 89% | 3199 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,014 psi | 86% | 3156 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,711 psi | 90% | 3228 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,115 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,680 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,014 psi | 88% | 3238 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 57,682 psi | 89% | 3212 fps | 99% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3199 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 58,711 psi | 90% | 3228 fps | 99.2% |
| Bofors RP7 | <<locked>> | 84% | 57,696 psi | 89% | 3127 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,204 psi | 90% | 3209 fps | 99% |
| Hodgdon H414 | <<locked>> | 84% | 57,276 psi | 88% | 3176 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 82% | 55,709 psi | 86% | 3127 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 92% | 58,030 psi | 89% | 3163 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,826 psi | 87% | 3143 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,884 psi | 88% | 3104 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,407 psi | 90% | 3330 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 58,189 psi | 90% | 3205 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 2080 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,840 psi | 86% | 3104 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,668 psi | 90% | 3143 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,434 psi | 87% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,726 psi | 90% | 3146 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 94% | 56,130 psi | 86% | 3202 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 56,478 psi | 87% | 3097 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 58,392 psi | 90% | 3143 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 57,043 psi | 88% | 3107 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 56,942 psi | 88% | 3153 fps | 98.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,801 psi | 67% | 3009 fps | 97.7% |
| Norma MRP | <<locked>> | 92% | 58,726 psi | 90% | 3251 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,711 psi | 89% | 3163 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,058 psi | 88% | 3222 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 86% | 56,681 psi | 87% | 3159 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 96% | 55,985 psi | 86% | 3153 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,087 psi | 59% | 2126 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,014 psi | 86% | 3143 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,957 psi | 89% | 3228 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,970 psi | 86% | 3264 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3205 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 57,435 psi | 88% | 3136 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,767 psi | 86% | 3150 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 84% | 57,696 psi | 89% | 3127 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,478 psi | 87% | 3097 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 58,392 psi | 90% | 3143 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,305 psi | 90% | 2999 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,840 psi | 86% | 3041 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,332 psi | 85% | 3143 fps | 98.7% |
| Somchem S355 | <<locked>> | 82% | 58,740 psi | 90% | 3127 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,825 psi | 86% | 3061 fps | 97.2% |
| Somchem S365 | <<locked>> | 88% | 58,682 psi | 90% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,681 psi | 87% | 3123 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 82% | 56,492 psi | 87% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,767 psi | 86% | 3100 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,144 psi | 86% | 3094 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 84% | 55,245 psi | 85% | 3104 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,682 psi | 90% | 3189 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,262 psi | 90% | 3241 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 96% | 55,245 psi | 85% | 3159 fps | 97.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,028 psi | 86% | 3209 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,288 psi | 85% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,464 psi | 88% | 3179 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,581 psi | 90% | 3287 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,391 psi | 87% | 3110 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% | 37,753 psi | 58% | 2756 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 49,298 psi | 76% | 3022 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 50,314 psi | 77% | 3097 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 82% | 43,294 psi | 67% | 2927 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 88% | 47,529 psi | 73% | 3038 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 96% | 46,282 psi | 71% | 2989 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 37,202 psi | 57% | 2831 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,122 psi | 71% | 3015 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,708 psi | 83% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,712 psi | 63% | 2864 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 42,264 psi | 65% | 2927 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,679 psi | 55% | 2779 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 33,330 psi | 51% | 2733 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,450 psi | 61% | 2920 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 41,858 psi | 64% | 2917 fps | 95.4% |
| Bofors RP30 | <<locked>> | 92% | 42,801 psi | 66% | 2956 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 42,264 psi | 65% | 2927 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 51,024 psi | 79% | 3015 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 44,367 psi | 68% | 2953 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 50,140 psi | 77% | 3058 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 52,344 psi | 81% | 3068 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 86% | 47,427 psi | 73% | 2976 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 49,763 psi | 77% | 3022 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,947 psi | 68% | 2897 fps | 100% |
| Hodgdon Retumbo | 85.1 gr | 88% | 39,450 psi | 61% | 2936 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,241 psi | 77% | 3077 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,949 psi | 43% | 1873 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,267 psi | 71% | 2933 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,924 psi | 80% | 3035 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 46,514 psi | 72% | 2956 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 48,878 psi | 75% | 2979 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 88% | 45,934 psi | 71% | 3012 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 50,183 psi | 77% | 2992 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 48,602 psi | 75% | 2979 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 34,940 psi | 54% | 2687 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 46,557 psi | 72% | 2969 fps | 96.6% |
| Norma 217 | <<locked>> | 96% | 38,450 psi | 59% | 2887 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 38,754 psi | 60% | 2877 fps | 96% |
| Norma URP | <<locked>> | 80% | 47,703 psi | 73% | 2999 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 46,195 psi | 71% | 3022 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 46,543 psi | 72% | 2986 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 39,059 psi | 60% | 2835 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,616 psi | 44% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,994 psi | 75% | 3031 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,775 psi | 72% | 3041 fps | 99.7% |
| ReloadSwiss RS 76 | 89 gr | 86% | 36,651 psi | 56% | 2848 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,688 psi | 73% | 3064 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 82% | 44,628 psi | 69% | 2907 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 40,205 psi | 62% | 2851 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 51,024 psi | 79% | 3015 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,183 psi | 77% | 2992 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 48,602 psi | 75% | 2979 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,737 psi | 84% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,153 psi | 76% | 2933 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 42,728 psi | 66% | 2907 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 55,405 psi | 85% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 48,950 psi | 75% | 2943 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,904 psi | 69% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,220 psi | 63% | 2838 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 53,069 psi | 82% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,950 psi | 75% | 2989 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 40,669 psi | 63% | 2812 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 48,675 psi | 75% | 2995 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 40,103 psi | 62% | 2864 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 47,500 psi | 73% | 3051 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 45,339 psi | 70% | 2976 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 52,011 psi | 80% | 3140 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,312 psi | 74% | 2940 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,328 psi | 77% | 3061 fps | 98.9% |
| Winchester StaBALL HD | 79.4 gr | 80% | 32,213 psi | 50% | 2795 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 40,292 psi | 62% | 2812 fps | 95% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 139gr | IBEX TRD. Hodgdon Retumbo delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 2,080 fps to 3,330 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 1:13.5 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 139gr | IBEX TRD they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, Vihtavuori N170, Vihtavuori N570 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.