Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 125gr | Barnes Solid bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Alliant Reloder-16 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 58,088 psi | 89% | 3215 fps | 98.8% |
| Accurate 3100 | <<locked>> | 96% | 55,259 psi | 85% | 3202 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 57,711 psi | 89% | 3212 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,072 psi | 86% | 3261 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 58,030 psi | 89% | 3346 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 57,232 psi | 88% | 3245 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,435 psi | 88% | 3307 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 96% | 55,317 psi | 85% | 3294 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,307 psi | 64% | 3035 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 58,624 psi | 90% | 3268 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 58,479 psi | 90% | 3294 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,724 psi | 87% | 3323 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 58,566 psi | 90% | 3346 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,913 psi | 88% | 3291 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,056 psi | 85% | 3291 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,057 psi | 86% | 3278 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,866 psi | 80% | 3261 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,043 psi | 88% | 3366 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,841 psi | 89% | 3333 fps | 98.4% |
| Bofors RP3 | <<locked>> | 82% | 55,985 psi | 86% | 3228 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 55,056 psi | 85% | 3291 fps | 98.1% |
| Bofors RP7 | <<locked>> | 86% | 55,216 psi | 85% | 3209 fps | 98.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,198 psi | 79% | 3196 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 82% | 56,231 psi | 87% | 3245 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 58,189 psi | 90% | 3317 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 56,971 psi | 88% | 3271 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 94% | 55,172 psi | 85% | 3232 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 96% | 58,015 psi | 89% | 3278 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,232 psi | 88% | 3238 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,879 psi | 78% | 3310 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 86% | 55,216 psi | 85% | 3281 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,506 psi | 56% | 2172 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,478 psi | 87% | 3228 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,811 psi | 87% | 3238 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,666 psi | 87% | 3235 fps | 99.1% |
| IMR 4831 | <<locked>> | 90% | 56,536 psi | 87% | 3251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,420 psi | 87% | 3225 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 98% | 56,724 psi | 87% | 3330 fps | 97.2% |
| Lovex S062 | <<locked>> | 82% | 56,927 psi | 88% | 3219 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,276 psi | 88% | 3235 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 55,332 psi | 85% | 3222 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,489 psi | 81% | 3159 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 57,783 psi | 89% | 3278 fps | 100% |
| Norma 204 | <<locked>> | 90% | 58,189 psi | 90% | 3294 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 54,940 psi | 85% | 3317 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 58,276 psi | 90% | 3304 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,783 psi | 89% | 3346 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 90% | 57,450 psi | 88% | 3297 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,550 psi | 87% | 3274 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 57% | 2221 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,912 psi | 86% | 3222 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,870 psi | 89% | 3340 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,391 psi | 87% | 3278 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,810 psi | 84% | 3307 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 3307 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 58,711 psi | 90% | 3235 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 56,246 psi | 87% | 3225 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 58,682 psi | 90% | 3274 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 56,260 psi | 87% | 3278 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 86% | 55,216 psi | 85% | 3209 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,276 psi | 88% | 3235 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 56,927 psi | 88% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,332 psi | 85% | 3222 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,972 psi | 89% | 3284 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,304 psi | 87% | 3107 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,826 psi | 87% | 3179 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,811 psi | 86% | 3271 fps | 98.1% |
| Somchem S355 | <<locked>> | 84% | 55,898 psi | 86% | 3222 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,043 psi | 88% | 3192 fps | 96.5% |
| Somchem S365 | <<locked>> | 92% | 58,639 psi | 90% | 3301 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,840 psi | 87% | 3245 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 86% | 57,392 psi | 88% | 3189 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,376 psi | 87% | 3238 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,565 psi | 87% | 3219 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 58,059 psi | 89% | 3192 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,898 psi | 86% | 3238 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 58,291 psi | 90% | 3310 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,781 psi | 84% | 3301 fps | 96.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 3268 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,652 psi | 87% | 3189 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 58,378 psi | 90% | 3317 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,856 psi | 89% | 3409 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,290 psi | 88% | 3241 fps | 98.3% |
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 2700 | <<locked>> | 80% | 54,288 psi | 84% | 3156 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 36,085 psi | 56% | 2828 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 54,041 psi | 83% | 3159 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,119 psi | 65% | 3009 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 94% | 53,940 psi | 83% | 3278 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 50,270 psi | 77% | 3130 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 46,601 psi | 72% | 3110 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 94% | 51,430 psi | 79% | 3225 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 98% | 38,551 psi | 59% | 2963 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,271 psi | 79% | 3156 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,795 psi | 84% | 3235 fps | 100% |
| Alliant Reloder-16 | 75.4 gr | 80% | 40,350 psi | 62% | 3018 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,833 psi | 72% | 3156 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 46,354 psi | 71% | 3097 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 44,469 psi | 68% | 3087 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,907 psi | 46% | 2733 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 88% | 34,447 psi | 53% | 2867 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,750 psi | 50% | 2858 fps | 95.1% |
| Bofors RP15 | <<locked>> | 92% | 44,019 psi | 68% | 3077 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 52,199 psi | 80% | 3169 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 44,469 psi | 68% | 3087 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 45,382 psi | 70% | 3025 fps | 96.4% |
| Hodgdon H1000 | <<locked>> | 98% | 47,747 psi | 73% | 3127 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 52,446 psi | 81% | 3182 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 43,976 psi | 68% | 3058 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 46,528 psi | 72% | 3081 fps | 96% |
| Hodgdon H4831 | <<locked>> | 92% | 51,517 psi | 79% | 3166 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 53,969 psi | 83% | 3209 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,956 psi | 58% | 2897 fps | 98.9% |
| Hodgdon Retumbo | <<locked>> | 96% | 44,222 psi | 68% | 3163 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 43,613 psi | 67% | 3064 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 42% | 1959 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,881 psi | 81% | 3169 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,930 psi | 63% | 2936 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,789 psi | 72% | 3058 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 40,205 psi | 62% | 2953 fps | 98.2% |
| IMR 4955 Enduron | <<locked>> | 92% | 52,721 psi | 81% | 3159 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 94% | 49,197 psi | 76% | 3189 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 53,374 psi | 82% | 3166 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,251 psi | 68% | 3002 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 42,627 psi | 66% | 2982 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 37,579 psi | 58% | 2864 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 54,143 psi | 83% | 3219 fps | 100% |
| Norma 204 | <<locked>> | 84% | 47,065 psi | 72% | 3097 fps | 95.7% |
| Norma MRP | 86.8 gr | 86% | 40,727 psi | 63% | 3035 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 41,539 psi | 64% | 3002 fps | 98.3% |
| Ramshot Grand | <<locked>> | 94% | 49,588 psi | 76% | 3202 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 40,495 psi | 62% | 2979 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 92% | 41,408 psi | 64% | 2992 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 43% | 2005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,243 psi | 80% | 3159 fps | 98.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,676 psi | 76% | 3219 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,192 psi | 65% | 3022 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,770 psi | 63% | 3031 fps | 97.9% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 41,466 psi | 64% | 3071 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 80% | 55,027 psi | 85% | 3182 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 49,168 psi | 76% | 3110 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 51,430 psi | 79% | 3150 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 88% | 45,643 psi | 70% | 3081 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,382 psi | 70% | 3025 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,251 psi | 68% | 3002 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 53,374 psi | 82% | 3166 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,627 psi | 66% | 2982 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,502 psi | 78% | 3163 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,472 psi | 76% | 3009 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,526 psi | 67% | 2940 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 45,252 psi | 70% | 3077 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 49,037 psi | 75% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 53,330 psi | 82% | 3133 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 38,218 psi | 59% | 2949 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 43,265 psi | 67% | 2999 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 47,065 psi | 72% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,946 psi | 66% | 2999 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 90% | 42,975 psi | 66% | 2976 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 54,331 psi | 84% | 3140 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,569 psi | 66% | 2999 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,431 psi | 51% | 2822 fps | 96.4% |
| Vihtavuori N560 | 92.9 gr | 92% | 50,966 psi | 78% | 3232 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 51,053 psi | 79% | 3199 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,424 psi | 65% | 2956 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 44,135 psi | 68% | 3061 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 28,616 psi | 44% | 2769 fps | 96.7% |
| Winchester Supreme 780 | <<locked>> | 90% | 46,166 psi | 71% | 3045 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 89 powders for .300 Rem. Ultra Mag. loaded with the .308 | 125gr | Barnes Solid. Winchester StaBALL HD delivers the highest muzzle velocity at 3,409 fps; across all powders the maximum-charge window runs from 2,172 fps to 3,409 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 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 125.0 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-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. Norma MRP, Alliant Reloder-16, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 125gr | Barnes Solid they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.