Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 125gr | Nosler AccuBond bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ReloadSwiss RS 70.
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% | 58,465 psi | 90% | 3225 fps | 98.9% |
| Accurate 3100 | <<locked>> | 96% | 55,680 psi | 86% | 3209 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 58,160 psi | 90% | 3219 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,478 psi | 87% | 3271 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 58,595 psi | 90% | 3356 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 57,450 psi | 88% | 3248 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,798 psi | 89% | 3314 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 96% | 55,637 psi | 86% | 3301 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,582 psi | 64% | 3041 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,201 psi | 85% | 3219 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,188 psi | 88% | 3333 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,694 psi | 84% | 3291 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,276 psi | 88% | 3297 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,463 psi | 85% | 3297 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,449 psi | 87% | 3284 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,417 psi | 81% | 3271 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,479 psi | 88% | 3373 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 58,189 psi | 90% | 3340 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 56,434 psi | 87% | 3235 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 55,463 psi | 85% | 3297 fps | 98.2% |
| Bofors RP7 | <<locked>> | 86% | 55,390 psi | 85% | 3212 fps | 98.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 3209 fps | 97% |
| Hodgdon H380 | <<locked>> | 82% | 56,463 psi | 87% | 3248 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 58,595 psi | 90% | 3323 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 57,348 psi | 88% | 3278 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 94% | 55,753 psi | 86% | 3241 fps | 96.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 58,407 psi | 90% | 3284 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,667 psi | 89% | 3245 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,198 psi | 79% | 3314 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 86% | 55,593 psi | 86% | 3287 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 56% | 2175 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,695 psi | 87% | 3228 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,188 psi | 88% | 3245 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,043 psi | 88% | 3245 fps | 99.1% |
| IMR 4831 | <<locked>> | 90% | 56,956 psi | 88% | 3258 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,739 psi | 87% | 3232 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 98% | 57,305 psi | 88% | 3337 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 57,203 psi | 88% | 3225 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,653 psi | 89% | 3241 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 55,724 psi | 86% | 3228 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,910 psi | 81% | 3166 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 58,233 psi | 90% | 3284 fps | 100% |
| Norma 204 | <<locked>> | 90% | 58,552 psi | 90% | 3304 fps | 98.3% |
| Norma MRP | <<locked>> | 94% | 55,303 psi | 85% | 3320 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 58,668 psi | 90% | 3310 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 58,349 psi | 90% | 3360 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 57,827 psi | 89% | 3304 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,072 psi | 88% | 3284 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 57% | 2224 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,275 psi | 87% | 3225 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 58,117 psi | 89% | 3343 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,797 psi | 87% | 3287 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,187 psi | 85% | 3310 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,547 psi | 81% | 3314 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 56,463 psi | 87% | 3228 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,303 psi | 85% | 3219 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 94% | 56,652 psi | 87% | 3284 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 86% | 55,390 psi | 85% | 3212 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,653 psi | 89% | 3241 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 57,203 psi | 88% | 3225 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,724 psi | 86% | 3228 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 58,392 psi | 90% | 3287 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,536 psi | 87% | 3110 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,203 psi | 88% | 3186 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,188 psi | 86% | 3278 fps | 98.2% |
| Somchem S355 | <<locked>> | 84% | 56,304 psi | 87% | 3228 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,566 psi | 89% | 3202 fps | 96.7% |
| Somchem S365 | <<locked>> | 90% | 55,172 psi | 85% | 3255 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,421 psi | 88% | 3255 fps | 99% |
| Vihtavuori N150 | <<locked>> | 86% | 57,827 psi | 89% | 3196 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,797 psi | 87% | 3245 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,101 psi | 88% | 3228 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 58,291 psi | 90% | 3196 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 56,260 psi | 87% | 3245 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 58,697 psi | 90% | 3317 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,187 psi | 85% | 3307 fps | 96.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 3274 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,985 psi | 88% | 3192 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 58,784 psi | 90% | 3327 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3422 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,667 psi | 89% | 3245 fps | 98.4% |
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% | 54,491 psi | 84% | 3159 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 36,303 psi | 56% | 2835 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 54,505 psi | 84% | 3166 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,380 psi | 65% | 3015 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 54,331 psi | 84% | 3287 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,676 psi | 78% | 3140 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 46,978 psi | 72% | 3120 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 94% | 51,938 psi | 80% | 3232 fps | 96% |
| ADI AR 2225 | <<locked>> | 98% | 38,914 psi | 60% | 2976 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,706 psi | 80% | 3163 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,582 psi | 62% | 3025 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,239 psi | 73% | 3166 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 46,717 psi | 72% | 3107 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 44,831 psi | 69% | 3097 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,197 psi | 46% | 2743 fps | 96.4% |
| Alliant Reloder-25 | <<locked>> | 88% | 34,751 psi | 53% | 2877 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,040 psi | 51% | 2864 fps | 95.3% |
| Bofors RP15 | <<locked>> | 92% | 44,222 psi | 68% | 3084 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 52,634 psi | 81% | 3176 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 44,831 psi | 69% | 3097 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,600 psi | 70% | 3031 fps | 96.6% |
| Hodgdon H1000 | <<locked>> | 98% | 48,037 psi | 74% | 3136 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 52,692 psi | 81% | 3186 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 44,353 psi | 68% | 3064 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 46,920 psi | 72% | 3087 fps | 96.2% |
| Hodgdon H4831 | <<locked>> | 92% | 51,851 psi | 80% | 3173 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,549 psi | 84% | 3222 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,218 psi | 59% | 2904 fps | 99% |
| Hodgdon Retumbo | <<locked>> | 96% | 44,541 psi | 69% | 3169 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 43,976 psi | 68% | 3071 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 42% | 1959 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,301 psi | 82% | 3179 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,133 psi | 63% | 2943 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,978 psi | 72% | 3064 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 40,451 psi | 62% | 2959 fps | 98.3% |
| IMR 4955 Enduron | <<locked>> | 92% | 53,040 psi | 82% | 3166 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 94% | 49,705 psi | 76% | 3199 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 53,606 psi | 83% | 3169 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,628 psi | 69% | 3012 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 42,873 psi | 66% | 2986 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 37,782 psi | 58% | 2871 fps | 95.9% |
| Norma 203B | <<locked>> | 80% | 54,418 psi | 84% | 3222 fps | 100% |
| Norma 204 | <<locked>> | 84% | 47,413 psi | 73% | 3104 fps | 95.8% |
| Norma MRP | 87.3 gr | 86% | 41,089 psi | 63% | 3045 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 41,800 psi | 64% | 3009 fps | 98.4% |
| Ramshot Grand | <<locked>> | 94% | 49,937 psi | 77% | 3212 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 40,857 psi | 63% | 2989 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 92% | 41,742 psi | 64% | 3002 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 43% | 2005 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,663 psi | 81% | 3166 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,125 psi | 77% | 3225 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,583 psi | 66% | 3031 fps | 98.4% |
| ReloadSwiss RS 70 | 82.9 gr | 80% | 40,959 psi | 63% | 3038 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 38,711 psi | 60% | 3002 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 49,414 psi | 76% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 48,312 psi | 74% | 3094 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 45,992 psi | 71% | 3091 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 45,600 psi | 70% | 3031 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,628 psi | 69% | 3012 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 53,606 psi | 83% | 3169 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,873 psi | 66% | 2986 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,923 psi | 78% | 3173 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,748 psi | 77% | 3012 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,700 psi | 67% | 2946 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 45,585 psi | 70% | 3084 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 49,443 psi | 76% | 3117 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 53,679 psi | 83% | 3136 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 38,479 psi | 59% | 2956 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 40,683 psi | 63% | 2943 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,268 psi | 73% | 3035 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,149 psi | 66% | 3002 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 43,294 psi | 67% | 2982 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 54,534 psi | 84% | 3143 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,757 psi | 66% | 3002 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 33,663 psi | 52% | 2828 fps | 96.5% |
| Vihtavuori N560 | 93.4 gr | 92% | 51,372 psi | 79% | 3238 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 51,387 psi | 79% | 3205 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,757 psi | 66% | 2966 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 44,483 psi | 68% | 3068 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,905 psi | 41% | 2703 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 46,499 psi | 72% | 3051 fps | 95.9% |
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 81 powders for .300 Rem. Ultra Mag. loaded with the .308 | 125gr | Nosler AccuBond. Winchester StaBALL HD delivers the highest muzzle velocity at 3,422 fps; across all powders the maximum-charge window runs from 2,175 fps to 3,422 fps. ADI AR 2225 gives the best case fill at 100 %, and 81 of the 81 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 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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, Vihtavuori N560, ReloadSwiss RS 70 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 125gr | Nosler AccuBond 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.