Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Lapua Mega bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP 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 3100 | <<locked>> | 94% | 55,796 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,710 psi | 87% | 3061 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,679 psi | 84% | 3104 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 57,116 psi | 88% | 3028 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,740 psi | 89% | 3114 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 55,724 psi | 86% | 3110 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,154 psi | 77% | 2999 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,860 psi | 69% | 2953 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 58,030 psi | 89% | 3110 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,653 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,421 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,882 psi | 84% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,305 psi | 88% | 3100 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,767 psi | 86% | 3107 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,072 psi | 88% | 3084 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,594 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,972 psi | 89% | 3173 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,754 psi | 89% | 3064 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 58,668 psi | 90% | 3150 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,576 psi | 81% | 3071 fps | 98.2% |
| Bofors RP5 | <<locked>> | 94% | 55,767 psi | 86% | 3107 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 58,798 psi | 90% | 3064 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3091 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 58,508 psi | 90% | 3117 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,159 psi | 88% | 3071 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 55,579 psi | 86% | 3048 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,334 psi | 90% | 3091 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,885 psi | 89% | 3038 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,419 psi | 85% | 3209 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 55,347 psi | 85% | 3084 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 57% | 1998 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,014 psi | 88% | 3045 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,637 psi | 87% | 3035 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 57,000 psi | 88% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,420 psi | 87% | 3035 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,450 psi | 88% | 3146 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 57,450 psi | 88% | 3031 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,550 psi | 85% | 3022 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,087 psi | 88% | 3035 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,305 psi | 90% | 3097 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 40,364 psi | 62% | 2871 fps | 97.2% |
| Norma MRP | <<locked>> | 92% | 55,724 psi | 86% | 3130 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 54,969 psi | 85% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,508 psi | 90% | 3169 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 57,812 psi | 89% | 3100 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,188 psi | 88% | 3097 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,768 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,421 psi | 90% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,898 psi | 88% | 3081 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,288 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,956 psi | 88% | 3205 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,793 psi | 80% | 3077 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,608 psi | 87% | 3015 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,056 psi | 85% | 3022 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 92% | 56,695 psi | 87% | 3087 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 58,798 psi | 90% | 3064 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,450 psi | 88% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,550 psi | 85% | 3022 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 58,262 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,072 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,811 psi | 87% | 2979 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,260 psi | 87% | 3084 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 56,057 psi | 86% | 3009 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,101 psi | 88% | 3009 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 55,593 psi | 86% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,377 psi | 88% | 3058 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,537 psi | 89% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,840 psi | 87% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,072 psi | 88% | 3035 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 56,072 psi | 86% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,347 psi | 85% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,477 psi | 85% | 3120 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 98% | 55,593 psi | 86% | 3094 fps | 98.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,692 psi | 81% | 3084 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,797 psi | 87% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,711 psi | 90% | 3117 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,158 psi | 85% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,493 psi | 88% | 3051 fps | 99.2% |
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% | 34,272 psi | 53% | 2612 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 45,948 psi | 71% | 2890 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 47,137 psi | 73% | 2966 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 53,664 psi | 83% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 41,046 psi | 63% | 2812 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 45,208 psi | 70% | 2920 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 43,642 psi | 67% | 2867 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 92% | 34,360 psi | 53% | 2697 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 41,423 psi | 64% | 2812 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 55,085 psi | 85% | 3002 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,874 psi | 68% | 2897 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,111 psi | 79% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 41,031 psi | 63% | 2802 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,378 psi | 61% | 2799 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,822 psi | 51% | 2644 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,676 psi | 47% | 2595 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,230 psi | 56% | 2779 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,128 psi | 83% | 3002 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 39,030 psi | 60% | 2785 fps | 95% |
| Bofors RP30 | <<locked>> | 94% | 42,482 psi | 65% | 2881 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 39,378 psi | 61% | 2799 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 48,472 psi | 75% | 2894 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 92% | 41,713 psi | 64% | 2831 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 47,703 psi | 73% | 2936 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 50,038 psi | 77% | 2953 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 48,327 psi | 74% | 2927 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,442 psi | 73% | 2907 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,365 psi | 64% | 2779 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,276 psi | 60% | 2871 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 47,543 psi | 73% | 2953 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,990 psi | 68% | 2818 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,835 psi | 77% | 2920 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 43,627 psi | 67% | 2831 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,601 psi | 72% | 2864 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 43,337 psi | 67% | 2890 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 47,485 psi | 73% | 2871 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 45,818 psi | 71% | 2854 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 33,634 psi | 52% | 2595 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 44,266 psi | 68% | 2854 fps | 96.5% |
| Norma 217 | <<locked>> | 98% | 37,710 psi | 58% | 2808 fps | 96.2% |
| Norma MRP | 77.7 gr | 80% | 35,926 psi | 55% | 2743 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 44,991 psi | 69% | 2877 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 43,308 psi | 67% | 2897 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,063 psi | 68% | 2867 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 86% | 36,013 psi | 55% | 2700 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 43% | 1841 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,346 psi | 84% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,064 psi | 71% | 2907 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,309 psi | 68% | 2920 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,260 psi | 56% | 2779 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,892 psi | 74% | 3005 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 52,866 psi | 81% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,194 psi | 70% | 2848 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 40,306 psi | 62% | 2785 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 48,472 psi | 75% | 2894 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,485 psi | 73% | 2871 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 45,818 psi | 71% | 2854 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,534 psi | 84% | 3018 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,765 psi | 81% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,572 psi | 72% | 2815 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,958 psi | 61% | 2782 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 52,605 psi | 81% | 2959 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,441 psi | 71% | 2828 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 41,989 psi | 65% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,232 psi | 59% | 2710 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 50,444 psi | 78% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,427 psi | 71% | 2871 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,913 psi | 58% | 2690 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 45,876 psi | 71% | 2871 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 36,912 psi | 57% | 2726 fps | 98.9% |
| Vihtavuori N560 | 83.5 gr | 86% | 44,773 psi | 69% | 2927 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 92% | 45,078 psi | 69% | 2907 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 48,834 psi | 75% | 3015 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,890 psi | 71% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,703 psi | 73% | 2936 fps | 98.8% |
| Winchester StaBALL HD | 76.9 gr | 80% | 29,356 psi | 45% | 2644 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,292 psi | 62% | 2749 fps | 95.6% |
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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Lapua Mega. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,209 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 150.0 gr projectile in 0.308" calls for a 1:11.5 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, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Lapua Mega 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.