Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Barnes RRLP 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,825 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,710 psi | 87% | 3064 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,595 psi | 90% | 3166 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 57,116 psi | 88% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,725 psi | 89% | 3114 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 55,506 psi | 85% | 3110 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,140 psi | 77% | 2995 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,860 psi | 69% | 2953 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,798 psi | 89% | 3107 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,624 psi | 90% | 3051 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,406 psi | 88% | 3117 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,824 psi | 84% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,072 psi | 88% | 3097 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,579 psi | 86% | 3104 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,811 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,769 psi | 89% | 3169 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,609 psi | 89% | 3061 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 58,450 psi | 90% | 3146 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,605 psi | 81% | 3071 fps | 98.2% |
| Bofors RP5 | <<locked>> | 94% | 55,579 psi | 86% | 3104 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 58,798 psi | 90% | 3064 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,448 psi | 85% | 3091 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 58,305 psi | 90% | 3114 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,956 psi | 88% | 3068 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 55,376 psi | 85% | 3048 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,088 psi | 89% | 3087 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,638 psi | 89% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3205 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 55,317 psi | 85% | 3084 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 57% | 1998 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,985 psi | 88% | 3041 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,652 psi | 87% | 3031 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 57,000 psi | 88% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,434 psi | 87% | 3035 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,232 psi | 88% | 3143 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 57,276 psi | 88% | 3031 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,550 psi | 85% | 3022 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,305 psi | 90% | 3100 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 40,219 psi | 62% | 2867 fps | 97.2% |
| Norma MRP | <<locked>> | 92% | 55,492 psi | 85% | 3127 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 58,639 psi | 90% | 3097 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,291 psi | 90% | 3166 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 57,783 psi | 89% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,014 psi | 88% | 3091 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 58% | 2044 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,407 psi | 90% | 3123 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,869 psi | 88% | 3077 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,259 psi | 85% | 3104 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,739 psi | 87% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,590 psi | 79% | 3074 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 56,405 psi | 87% | 3012 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,697 psi | 90% | 3077 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 56,681 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% | 57,276 psi | 88% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,550 psi | 85% | 3022 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 58,044 psi | 89% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,072 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,652 psi | 87% | 2976 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,231 psi | 87% | 3081 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 56,043 psi | 86% | 3009 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,898 psi | 88% | 3005 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 55,564 psi | 86% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,363 psi | 88% | 3058 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,508 psi | 89% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,811 psi | 87% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,840 psi | 87% | 3031 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 56,072 psi | 86% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,317 psi | 85% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,274 psi | 85% | 3117 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 98% | 55,637 psi | 86% | 3094 fps | 98.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,504 psi | 81% | 3081 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,565 psi | 87% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,508 psi | 90% | 3114 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,114 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% | 34,243 psi | 53% | 2612 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 45,890 psi | 71% | 2890 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 47,137 psi | 73% | 2966 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 53,635 psi | 83% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,886 psi | 63% | 2805 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 88% | 45,049 psi | 69% | 2917 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 96% | 43,613 psi | 67% | 2867 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 34,214 psi | 53% | 2694 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 41,263 psi | 64% | 2808 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 55,027 psi | 85% | 2999 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,642 psi | 67% | 2894 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,894 psi | 78% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,872 psi | 63% | 2802 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,233 psi | 60% | 2792 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,764 psi | 50% | 2641 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,545 psi | 47% | 2592 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,201 psi | 56% | 2779 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,969 psi | 83% | 3002 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 41,713 psi | 64% | 2844 fps | 95.9% |
| Bofors RP30 | <<locked>> | 94% | 42,467 psi | 65% | 2881 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 39,233 psi | 60% | 2792 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 48,428 psi | 75% | 2894 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 92% | 41,727 psi | 64% | 2831 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 47,514 psi | 73% | 2933 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 50,024 psi | 77% | 2953 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 48,153 psi | 74% | 2920 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 47,253 psi | 73% | 2907 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,350 psi | 64% | 2776 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 39,102 psi | 60% | 2864 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 47,514 psi | 73% | 2953 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 42% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,976 psi | 68% | 2818 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,835 psi | 77% | 2920 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 43,569 psi | 67% | 2831 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,412 psi | 71% | 2861 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 43,308 psi | 67% | 2890 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 47,442 psi | 73% | 2867 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 45,803 psi | 70% | 2858 fps | 98.6% |
| Lovex S071 | <<locked>> | 84% | 33,591 psi | 52% | 2595 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 44,063 psi | 68% | 2851 fps | 96.5% |
| Norma 217 | <<locked>> | 98% | 37,536 psi | 58% | 2805 fps | 96.1% |
| Norma MRP | 77.5 gr | 80% | 35,723 psi | 55% | 2736 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 44,976 psi | 69% | 2874 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 43,323 psi | 67% | 2897 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 43,903 psi | 68% | 2864 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 86% | 35,998 psi | 55% | 2700 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 43% | 1837 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,114 psi | 83% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,890 psi | 71% | 2900 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,150 psi | 68% | 2917 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 36,114 psi | 56% | 2776 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,688 psi | 73% | 3002 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,837 psi | 81% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,179 psi | 70% | 2848 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 40,263 psi | 62% | 2785 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 48,428 psi | 75% | 2894 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,442 psi | 73% | 2867 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 45,803 psi | 70% | 2858 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,288 psi | 84% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,736 psi | 81% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,412 psi | 71% | 2812 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,914 psi | 61% | 2779 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 52,576 psi | 81% | 2956 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,441 psi | 71% | 2831 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 41,945 psi | 65% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,189 psi | 59% | 2707 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 50,401 psi | 78% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,369 psi | 71% | 2867 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,898 psi | 58% | 2687 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 45,861 psi | 71% | 2871 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 36,724 psi | 57% | 2723 fps | 98.9% |
| Vihtavuori N560 | 83.3 gr | 86% | 44,599 psi | 69% | 2920 fps | 95% |
| Vihtavuori N565 | <<locked>> | 92% | 45,092 psi | 69% | 2907 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 48,820 psi | 75% | 3015 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,716 psi | 70% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,659 psi | 73% | 2936 fps | 98.8% |
| Winchester StaBALL HD | 76.7 gr | 80% | 29,225 psi | 45% | 2641 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,277 psi | 62% | 2746 fps | 95.5% |
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 | Barnes RRLP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,205 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 1:11.0 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 | Barnes RRLP 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.