Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Impala LW CFN bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 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>> | 92% | 57,972 psi | 89% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,421 psi | 90% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,072 psi | 86% | 3117 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 90% | 58,334 psi | 90% | 3114 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 56,608 psi | 87% | 3117 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 3074 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,806 psi | 77% | 3041 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,320 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,044 psi | 89% | 3104 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,203 psi | 88% | 3123 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,595 psi | 90% | 3094 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,160 psi | 90% | 3150 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,579 psi | 86% | 3127 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,928 psi | 89% | 3064 fps | 96.2% |
| Bofors RP15 | <<locked>> | 94% | 56,159 psi | 86% | 3104 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,392 psi | 90% | 3153 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 57,203 psi | 88% | 3123 fps | 99.4% |
| Bofors RP7 | <<locked>> | 82% | 55,985 psi | 86% | 3012 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 98% | 56,449 psi | 87% | 3100 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 82% | 55,448 psi | 85% | 3061 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 82% | 57,667 psi | 89% | 3071 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 90% | 56,275 psi | 87% | 3054 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,143 psi | 85% | 3035 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,172 psi | 85% | 2989 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,942 psi | 88% | 3225 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 56,202 psi | 86% | 3091 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 58% | 2011 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,609 psi | 89% | 3045 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,927 psi | 88% | 3031 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 58,392 psi | 90% | 3061 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,869 psi | 88% | 3035 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 58,465 psi | 90% | 3156 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,469 psi | 70% | 2946 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 58,291 psi | 90% | 3035 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,623 psi | 87% | 3028 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 55,825 psi | 86% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,143 psi | 85% | 3045 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 46,050 psi | 71% | 2979 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 57,116 psi | 88% | 3143 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 56,028 psi | 86% | 3048 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,405 psi | 85% | 3110 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 58,784 psi | 90% | 3104 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,755 psi | 90% | 3110 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,261 psi | 59% | 2057 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,218 psi | 90% | 3087 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,144 psi | 86% | 3110 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,465 psi | 90% | 3219 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 3173 fps | 98.3% |
| Rottweil R 904 | <<locked>> | 88% | 55,767 psi | 86% | 3028 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 90% | 57,928 psi | 89% | 3100 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 55,985 psi | 86% | 3012 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,291 psi | 90% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,623 psi | 87% | 3028 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,522 psi | 89% | 2982 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,522 psi | 89% | 3094 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 57,783 psi | 89% | 3015 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 57,159 psi | 88% | 3054 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,624 psi | 90% | 3068 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 58,305 psi | 90% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,638 psi | 89% | 3038 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,175 psi | 90% | 3041 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 57,130 psi | 88% | 3045 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,319 psi | 88% | 3077 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,565 psi | 87% | 3130 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 57,682 psi | 89% | 3120 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,581 psi | 90% | 3173 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,305 psi | 88% | 2982 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,651 psi | 86% | 3064 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,435 psi | 88% | 3179 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,465 psi | 90% | 3058 fps | 99.4% |
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 3100 | <<locked>> | 80% | 39,363 psi | 61% | 2717 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 51,256 psi | 79% | 2969 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 48,921 psi | 75% | 2992 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 42,134 psi | 65% | 2825 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 84% | 43,381 psi | 67% | 2874 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 42,322 psi | 65% | 2831 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 34,156 psi | 53% | 2684 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,950 psi | 74% | 2963 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,322 psi | 65% | 2822 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,450 psi | 59% | 2766 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,275 psi | 57% | 2736 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,576 psi | 50% | 2641 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,379 psi | 64% | 2881 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,491 psi | 84% | 3005 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 40,886 psi | 63% | 2818 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 41,901 psi | 64% | 2861 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 38,450 psi | 59% | 2766 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 52,562 psi | 81% | 2956 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 88% | 40,408 psi | 62% | 2792 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 52,069 psi | 80% | 3005 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 53,983 psi | 83% | 3012 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 46,122 psi | 71% | 2874 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,339 psi | 70% | 2858 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,672 psi | 70% | 2841 fps | 100% |
| Hodgdon Retumbo | 82.2 gr | 86% | 38,580 psi | 59% | 2844 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 52,315 psi | 81% | 3028 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 43% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,834 psi | 74% | 2884 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,519 psi | 82% | 2976 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 48,254 psi | 74% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,556 psi | 69% | 2815 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 86% | 44,773 psi | 69% | 2910 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 42,757 psi | 66% | 2890 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 51,706 psi | 80% | 2933 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 50,169 psi | 77% | 2927 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 34,258 psi | 53% | 2595 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 48,283 psi | 74% | 2923 fps | 97.7% |
| Norma 217 | <<locked>> | 92% | 35,505 psi | 55% | 2740 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 40,466 psi | 62% | 2838 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 49,429 psi | 76% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,872 psi | 64% | 2858 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,327 psi | 74% | 2936 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 37,971 psi | 58% | 2736 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 44% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,894 psi | 78% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,820 psi | 75% | 2992 fps | 100% |
| ReloadSwiss RS 76 | 85.9 gr | 84% | 35,737 psi | 55% | 2756 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 46,572 psi | 72% | 2969 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 43,337 psi | 67% | 2799 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,858 psi | 64% | 2808 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 52,562 psi | 81% | 2956 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,706 psi | 80% | 2933 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 50,169 psi | 77% | 2927 fps | 99.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,763 psi | 78% | 2877 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,510 psi | 64% | 2802 fps | 96.2% |
| Somchem S361 | <<locked>> | 80% | 44,599 psi | 69% | 2785 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 46,847 psi | 72% | 2904 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,699 psi | 66% | 2795 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 54,737 psi | 84% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,763 psi | 78% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,159 psi | 57% | 2661 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 50,430 psi | 78% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,858 psi | 64% | 2818 fps | 99.7% |
| Vihtavuori N560 | 83.3 gr | 84% | 46,282 psi | 71% | 2946 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 44,309 psi | 68% | 2881 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 94% | 47,442 psi | 73% | 2982 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,038 psi | 77% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,185 psi | 80% | 3005 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,721 psi | 52% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,030 psi | 60% | 2710 fps | 95.3% |
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 | 150gr | Impala LW CFN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,225 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,225 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 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Impala LW CFN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, Alliant Reloder-50 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.