Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 146.6gr | Sax KDG-S 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, 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>> | 96% | 58,610 psi | 90% | 3084 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,347 psi | 85% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,667 psi | 89% | 3179 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 56,434 psi | 87% | 3048 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,826 psi | 87% | 3127 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 54,853 psi | 84% | 3127 fps | 98% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,153 psi | 76% | 3005 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,903 psi | 68% | 2956 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,029 psi | 88% | 3123 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,725 psi | 89% | 3068 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,420 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,928 psi | 89% | 3150 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,333 psi | 87% | 3114 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,784 psi | 90% | 3182 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,869 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,709 psi | 86% | 3153 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,724 psi | 87% | 3182 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,638 psi | 89% | 3163 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,576 psi | 79% | 3077 fps | 98% |
| Bofors RP5 | <<locked>> | 96% | 58,784 psi | 90% | 3182 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 57,841 psi | 89% | 3077 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 3104 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 86% | 57,377 psi | 88% | 3127 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,275 psi | 87% | 3087 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 58,537 psi | 90% | 3123 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,493 psi | 88% | 3107 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,782 psi | 87% | 3051 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,476 psi | 84% | 3219 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 54,491 psi | 84% | 3100 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 57% | 2028 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,246 psi | 87% | 3061 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,854 psi | 86% | 3051 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 55,999 psi | 86% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,535 psi | 85% | 3048 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 96% | 56,507 psi | 87% | 3159 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 56,420 psi | 87% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,204 psi | 90% | 3094 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,564 psi | 86% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,392 psi | 88% | 3114 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 39,131 psi | 60% | 2864 fps | 96.6% |
| Norma MRP | <<locked>> | 92% | 54,650 psi | 84% | 3140 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 57,740 psi | 89% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,421 psi | 88% | 3179 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 56,811 psi | 87% | 3114 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,130 psi | 86% | 3107 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 58% | 2070 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,363 psi | 88% | 3140 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,782 psi | 86% | 3094 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,508 psi | 90% | 3182 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3215 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,691 psi | 78% | 3081 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 55,303 psi | 85% | 3028 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,001 psi | 89% | 3097 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 55,622 psi | 86% | 3100 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 57,841 psi | 89% | 3077 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,420 psi | 87% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,204 psi | 90% | 3094 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,290 psi | 88% | 3087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,216 psi | 85% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,767 psi | 86% | 2995 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,201 psi | 85% | 3097 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 58,682 psi | 90% | 3077 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,231 psi | 87% | 3025 fps | 97.6% |
| Somchem S365 | <<locked>> | 90% | 58,320 psi | 90% | 3114 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,159 psi | 86% | 3068 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 56,536 psi | 87% | 2995 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,767 psi | 86% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,115 psi | 86% | 3048 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,114 psi | 85% | 3054 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,972 psi | 89% | 3127 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,639 psi | 90% | 3199 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,479 psi | 90% | 3166 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,811 psi | 86% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,580 psi | 89% | 3133 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 58,465 psi | 90% | 3232 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,550 psi | 87% | 3064 fps | 99.1% |
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% | 33,011 psi | 51% | 2605 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 44,686 psi | 69% | 2894 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 49,705 psi | 76% | 3041 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 52,808 psi | 81% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,016 psi | 62% | 2815 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 44,150 psi | 68% | 2923 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 42,699 psi | 66% | 2874 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 94% | 35,665 psi | 55% | 2756 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,393 psi | 62% | 2815 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,998 psi | 83% | 3018 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,888 psi | 66% | 2907 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,096 psi | 77% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,972 psi | 62% | 2805 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,147 psi | 63% | 2861 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,720 psi | 49% | 2638 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,749 psi | 49% | 2651 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,983 psi | 54% | 2772 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 40,756 psi | 63% | 2851 fps | 95.5% |
| Bofors RP30 | <<locked>> | 94% | 41,408 psi | 64% | 2884 fps | 95.1% |
| Bofors RP5 | <<locked>> | 86% | 41,147 psi | 63% | 2861 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 47,616 psi | 73% | 2907 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 92% | 40,857 psi | 63% | 2838 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 46,572 psi | 72% | 2946 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 49,197 psi | 76% | 2969 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 47,427 psi | 73% | 2933 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,383 psi | 71% | 2917 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,335 psi | 62% | 2785 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,232 psi | 59% | 2871 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,586 psi | 72% | 2963 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 42% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,033 psi | 66% | 2828 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,965 psi | 75% | 2936 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 42,598 psi | 66% | 2841 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,672 psi | 70% | 2874 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 45,571 psi | 70% | 2963 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 46,398 psi | 71% | 2881 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 44,686 psi | 69% | 2864 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 32,242 psi | 50% | 2585 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 43,178 psi | 66% | 2858 fps | 96% |
| Norma 217 | <<locked>> | 98% | 36,506 psi | 56% | 2802 fps | 95.5% |
| Norma MRP | 80.9 gr | 82% | 37,449 psi | 58% | 2805 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 43,888 psi | 68% | 2884 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,235 psi | 65% | 2900 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 42,960 psi | 66% | 2871 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 37,739 psi | 58% | 2766 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,949 psi | 43% | 1864 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,316 psi | 82% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,904 psi | 69% | 2910 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,323 psi | 67% | 2930 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,215 psi | 54% | 2776 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,659 psi | 72% | 3005 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 51,590 psi | 79% | 2972 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,324 psi | 68% | 2858 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 39,276 psi | 60% | 2789 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 47,616 psi | 73% | 2907 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,398 psi | 71% | 2881 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 44,686 psi | 69% | 2864 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,388 psi | 82% | 3031 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,764 psi | 80% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,484 psi | 70% | 2825 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,957 psi | 60% | 2785 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 51,503 psi | 79% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,527 psi | 70% | 2841 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 40,770 psi | 63% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,144 psi | 57% | 2710 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 49,327 psi | 76% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,498 psi | 70% | 2884 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 39,566 psi | 61% | 2753 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 44,889 psi | 69% | 2881 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 35,592 psi | 55% | 2723 fps | 98.5% |
| Vihtavuori N560 | 86.8 gr | 88% | 46,992 psi | 72% | 2995 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 43,932 psi | 68% | 2907 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,904 psi | 69% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,746 psi | 72% | 2949 fps | 98.6% |
| Winchester StaBALL HD | 78.1 gr | 80% | 28,123 psi | 43% | 2625 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,247 psi | 60% | 2753 fps | 95% |
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 | 146.6gr | Sax KDG-S. Winchester StaBALL HD delivers the highest muzzle velocity at 3,232 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,232 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 57–90 %, leaving at least 10 % headroom. The 146.6 gr projectile in 0.308" calls for a 1:12.5 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 | 146.6gr | Sax KDG-S 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.