Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 135gr | Atomic 29 FNHP 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, IMR 7828 SSC 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>> | 96% | 58,030 psi | 89% | 3166 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 58,784 psi | 90% | 3215 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,261 psi | 88% | 3258 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,898 psi | 86% | 3140 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,376 psi | 87% | 3212 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 58,291 psi | 90% | 3268 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,834 psi | 75% | 3077 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,555 psi | 67% | 3022 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,072 psi | 88% | 3159 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,956 psi | 86% | 3225 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,305 psi | 88% | 3238 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,898 psi | 86% | 3199 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,131 psi | 89% | 3261 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,419 psi | 85% | 3182 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 3232 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,318 psi | 87% | 3264 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,029 psi | 88% | 3241 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 58,305 psi | 90% | 3176 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,923 psi | 78% | 3150 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 58,131 psi | 89% | 3261 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 57,363 psi | 88% | 3166 fps | 99.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,099 psi | 83% | 3179 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 82% | 58,508 psi | 90% | 3196 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 56,942 psi | 88% | 3215 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 55,724 psi | 86% | 3169 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 94% | 58,030 psi | 89% | 3202 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,811 psi | 87% | 3186 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,188 psi | 86% | 3140 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,998 psi | 83% | 3294 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 58,334 psi | 90% | 3248 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,564 psi | 56% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,724 psi | 86% | 3143 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,317 psi | 85% | 3136 fps | 99.4% |
| IMR 4831 | <<locked>> | 88% | 55,434 psi | 85% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,216 psi | 85% | 3130 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 96% | 55,927 psi | 86% | 3238 fps | 97.8% |
| Lovex S065 | <<locked>> | 86% | 55,782 psi | 86% | 3130 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 57,682 psi | 89% | 3179 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 3123 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 57,029 psi | 88% | 3199 fps | 98.6% |
| Norma MRP | <<locked>> | 94% | 58,421 psi | 90% | 3287 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 57,159 psi | 88% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,971 psi | 88% | 3261 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 56,449 psi | 87% | 3199 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 55,651 psi | 86% | 3186 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 57% | 2159 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 58,291 psi | 90% | 3179 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,782 psi | 87% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,216 psi | 85% | 3176 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,073 psi | 89% | 3271 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,463 psi | 85% | 3291 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 58,537 psi | 90% | 3173 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,450 psi | 88% | 3179 fps | 98% |
| Rottweil R 905 | <<locked>> | 92% | 55,172 psi | 85% | 3182 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 86% | 57,363 psi | 88% | 3166 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,782 psi | 86% | 3130 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 88% | 57,682 psi | 89% | 3179 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,739 psi | 87% | 3179 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,334 psi | 90% | 3048 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,361 psi | 85% | 3077 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 58,624 psi | 90% | 3238 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 58,117 psi | 89% | 3166 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,753 psi | 86% | 3100 fps | 97.1% |
| Somchem S365 | <<locked>> | 90% | 57,740 psi | 89% | 3199 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,869 psi | 86% | 3153 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 84% | 55,956 psi | 86% | 3084 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,332 psi | 85% | 3136 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,579 psi | 86% | 3127 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 58,392 psi | 90% | 3192 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,217 psi | 88% | 3209 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,117 psi | 89% | 3278 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,044 psi | 89% | 3241 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,361 psi | 85% | 3087 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,174 psi | 88% | 3215 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,798 psi | 89% | 3314 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,028 psi | 86% | 3146 fps | 98.7% |
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>> | 82% | 34,896 psi | 54% | 2726 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 44,092 psi | 68% | 2969 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 92% | 53,098 psi | 82% | 3189 fps | 96.1% |
| ADI AR 2208 | <<locked>> | 80% | 52,402 psi | 81% | 3084 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 42,569 psi | 66% | 2953 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 47,065 psi | 72% | 3068 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 98% | 45,397 psi | 70% | 3005 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 37,797 psi | 58% | 2884 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,461 psi | 82% | 3107 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,264 psi | 65% | 2982 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,371 psi | 76% | 3114 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,424 psi | 65% | 2940 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 43,772 psi | 67% | 3002 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,299 psi | 48% | 2703 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 33,620 psi | 52% | 2779 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,548 psi | 53% | 2835 fps | 96.9% |
| Bofors RP15 | <<locked>> | 90% | 43,163 psi | 66% | 2982 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 54,346 psi | 84% | 3117 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 44,048 psi | 68% | 3015 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 43,772 psi | 67% | 3002 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 47,021 psi | 72% | 2986 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 94% | 43,337 psi | 67% | 2969 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 54,607 psi | 84% | 3136 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,035 psi | 71% | 3022 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 48,602 psi | 75% | 3048 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 90% | 50,285 psi | 77% | 3074 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,400 psi | 76% | 3054 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,740 psi | 61% | 2858 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 92% | 40,596 psi | 62% | 3002 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 46,006 psi | 71% | 3035 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 42% | 1900 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,554 psi | 65% | 2904 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,515 psi | 75% | 3015 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 42,047 psi | 65% | 2913 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 88% | 48,385 psi | 74% | 3009 fps | 95.4% |
| IMR 7828 SSC | 90.9 gr | 92% | 48,457 psi | 75% | 3104 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 45,963 psi | 71% | 2963 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 44,193 psi | 68% | 2940 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 34,127 psi | 53% | 2707 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 42,656 psi | 66% | 2933 fps | 95.2% |
| Norma MRP | 84.1 gr | 82% | 36,941 psi | 57% | 2867 fps | 95% |
| Norma URP | <<locked>> | 80% | 43,366 psi | 67% | 2959 fps | 99.2% |
| Ramshot Grand | <<locked>> | 90% | 45,121 psi | 69% | 3041 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 42,424 psi | 65% | 2946 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 40,379 psi | 62% | 2900 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 43% | 1942 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,346 psi | 84% | 3117 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,533 psi | 81% | 3169 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,251 psi | 68% | 2982 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,772 psi | 66% | 3002 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 37,478 psi | 58% | 2907 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 51,053 psi | 79% | 3058 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 46,963 psi | 72% | 2995 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 41,640 psi | 64% | 2923 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 47,021 psi | 72% | 2986 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,963 psi | 71% | 2963 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 80% | 44,193 psi | 68% | 2940 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,808 psi | 81% | 3117 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,343 psi | 79% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,991 psi | 69% | 2897 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,278 psi | 64% | 2920 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 51,053 psi | 79% | 3061 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 48,443 psi | 75% | 2976 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 40,176 psi | 62% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 39,334 psi | 61% | 2841 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 48,849 psi | 75% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,918 psi | 69% | 2959 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 86% | 39,189 psi | 60% | 2822 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 44,382 psi | 68% | 2959 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 34,954 psi | 54% | 2785 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 90% | 50,198 psi | 77% | 3140 fps | 96% |
| Vihtavuori N565 | <<locked>> | 94% | 46,615 psi | 72% | 3038 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,527 psi | 69% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,195 psi | 71% | 3025 fps | 98% |
| Winchester StaBALL HD | 81.2 gr | 80% | 27,731 psi | 43% | 2677 fps | 97.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,829 psi | 64% | 2884 fps | 95.3% |
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 | 135gr | Atomic 29 FNHP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,314 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 56–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:15.5 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, IMR 7828 SSC, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 135gr | Atomic 29 FNHP 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.