Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 142gr | IBEX TRD bullet and 73 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% | 55,709 psi | 86% | 3064 fps | 99.9% |
| Accurate 4350 | <<locked>> | 84% | 56,159 psi | 86% | 3107 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,551 psi | 89% | 3202 fps | 97.3% |
| ADI AR 2209 | <<locked>> | 90% | 56,115 psi | 86% | 3143 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 94% | 58,146 psi | 89% | 3205 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 3087 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,688 psi | 73% | 3054 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,608 psi | 87% | 3140 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,608 psi | 87% | 3140 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,043 psi | 86% | 3159 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,363 psi | 88% | 3169 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,956 psi | 86% | 3130 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,595 psi | 90% | 3202 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,159 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,608 psi | 86% | 3179 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,855 psi | 88% | 3212 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 57,537 psi | 89% | 3186 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,738 psi | 86% | 3173 fps | 98.5% |
| Bofors RP5 | <<locked>> | 94% | 58,595 psi | 90% | 3202 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,551 psi | 89% | 3097 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 3179 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 57,145 psi | 88% | 3150 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 82% | 55,724 psi | 86% | 3104 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 92% | 57,827 psi | 89% | 3136 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,681 psi | 87% | 3117 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,710 psi | 87% | 3077 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,175 psi | 90% | 3304 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 58,015 psi | 89% | 3179 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 57% | 2054 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,709 psi | 86% | 3077 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,697 psi | 90% | 3120 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,275 psi | 87% | 3094 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,537 psi | 90% | 3117 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 94% | 55,999 psi | 86% | 3176 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 56,434 psi | 87% | 3071 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,233 psi | 90% | 3117 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 56,869 psi | 88% | 3081 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 56,869 psi | 88% | 3127 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 43,598 psi | 67% | 2986 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 58,595 psi | 90% | 3228 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,537 psi | 89% | 3136 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,985 psi | 88% | 3196 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 86% | 56,579 psi | 87% | 3136 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 96% | 55,782 psi | 86% | 3127 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 59% | 2106 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,956 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,696 psi | 89% | 3199 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,637 psi | 86% | 3235 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 3179 fps | 97.2% |
| Rottweil R 904 | <<locked>> | 90% | 57,334 psi | 88% | 3110 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,521 psi | 85% | 3123 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 84% | 57,551 psi | 89% | 3097 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,434 psi | 87% | 3071 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,233 psi | 90% | 3117 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,175 psi | 90% | 2969 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,695 psi | 86% | 3015 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,129 psi | 85% | 3117 fps | 98.8% |
| Somchem S355 | <<locked>> | 82% | 58,697 psi | 90% | 3100 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,651 psi | 86% | 3035 fps | 97.2% |
| Somchem S365 | <<locked>> | 88% | 58,334 psi | 90% | 3140 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,492 psi | 87% | 3097 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 82% | 56,405 psi | 87% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,593 psi | 86% | 3071 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,014 psi | 86% | 3071 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 84% | 55,143 psi | 85% | 3077 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,624 psi | 90% | 3159 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,102 psi | 89% | 3215 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 96% | 55,245 psi | 85% | 3136 fps | 97.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 3186 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,230 psi | 85% | 3022 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,334 psi | 88% | 3150 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,276 psi | 90% | 3261 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,246 psi | 87% | 3084 fps | 98.9% |
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% | 37,710 psi | 58% | 2733 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 49,211 psi | 76% | 2995 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 50,154 psi | 77% | 3074 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 40,567 psi | 62% | 2844 fps | 95% |
| ADI AR 2213 | <<locked>> | 88% | 47,514 psi | 73% | 3015 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 96% | 46,195 psi | 71% | 2966 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 37,057 psi | 57% | 2808 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,002 psi | 63% | 2848 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,002 psi | 63% | 2848 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,035 psi | 71% | 2992 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,476 psi | 82% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,669 psi | 63% | 2841 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 42,105 psi | 65% | 2904 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,592 psi | 55% | 2756 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,285 psi | 48% | 2654 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,334 psi | 61% | 2897 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 41,742 psi | 64% | 2894 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 42,670 psi | 66% | 2930 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 42,105 psi | 65% | 2904 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 50,937 psi | 78% | 2989 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 44,208 psi | 68% | 2930 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 50,125 psi | 77% | 3031 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 52,141 psi | 80% | 3041 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 86% | 47,369 psi | 73% | 2956 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 49,705 psi | 76% | 2999 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,830 psi | 67% | 2871 fps | 100% |
| Hodgdon Retumbo | 83.9 gr | 88% | 39,363 psi | 61% | 2917 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 50,125 psi | 77% | 3051 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,209 psi | 71% | 2910 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,851 psi | 80% | 3009 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 46,441 psi | 71% | 2933 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 48,747 psi | 75% | 2953 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 88% | 45,905 psi | 71% | 2989 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 50,082 psi | 77% | 2966 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 48,515 psi | 75% | 2953 fps | 98.8% |
| Lovex S071 | <<locked>> | 80% | 32,779 psi | 50% | 2612 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 46,528 psi | 72% | 2946 fps | 96.7% |
| Norma 217 | <<locked>> | 96% | 38,348 psi | 59% | 2864 fps | 96% |
| Norma MRP | <<locked>> | 80% | 38,624 psi | 59% | 2851 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 47,616 psi | 73% | 2976 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 45,992 psi | 71% | 2999 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 46,485 psi | 72% | 2963 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 38,899 psi | 60% | 2808 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 44% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,849 psi | 75% | 3005 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,804 psi | 72% | 3018 fps | 99.7% |
| ReloadSwiss RS 76 | 87.7 gr | 86% | 36,564 psi | 56% | 2828 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,529 psi | 73% | 3045 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 82% | 44,585 psi | 69% | 2881 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 40,147 psi | 62% | 2828 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 50,937 psi | 78% | 2989 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,082 psi | 77% | 2966 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 48,515 psi | 75% | 2953 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,752 psi | 84% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,139 psi | 76% | 2907 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,798 psi | 61% | 2822 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 55,317 psi | 85% | 3051 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 48,950 psi | 75% | 2923 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 44,831 psi | 69% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,031 psi | 63% | 2815 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 52,982 psi | 82% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,892 psi | 75% | 2963 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 38,029 psi | 59% | 2733 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 48,689 psi | 75% | 2969 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 40,001 psi | 62% | 2841 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 47,282 psi | 73% | 3022 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 90% | 45,194 psi | 70% | 2953 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 51,837 psi | 80% | 3117 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,196 psi | 74% | 2913 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,314 psi | 77% | 3035 fps | 99% |
| Winchester StaBALL HD | 78.3 gr | 80% | 32,227 psi | 50% | 2779 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 40,147 psi | 62% | 2789 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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 142gr | IBEX TRD. Hodgdon Retumbo delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 2,054 fps to 3,304 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 142.0 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, Bofors RP30 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 | 142gr | IBEX TRD 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.