Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Swift A-Frame bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,535 psi | 85% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,072 psi | 86% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,465 psi | 90% | 3166 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 57,188 psi | 88% | 3107 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 55,216 psi | 85% | 3104 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 3061 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,066 psi | 74% | 3015 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,811 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,160 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,594 psi | 87% | 3091 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,506 psi | 85% | 3104 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,913 psi | 88% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,594 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,769 psi | 89% | 3163 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,753 psi | 87% | 3054 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 58,407 psi | 90% | 3146 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,579 psi | 87% | 3133 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,506 psi | 85% | 3104 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,885 psi | 89% | 3054 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,114 psi | 85% | 3087 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,624 psi | 89% | 3104 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,217 psi | 87% | 3061 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 90% | 54,926 psi | 85% | 3041 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,667 psi | 89% | 3084 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,276 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,564 psi | 86% | 3205 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,534 psi | 84% | 3071 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 57% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,231 psi | 87% | 3035 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,651 psi | 86% | 3022 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,449 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,724 psi | 86% | 3028 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 56,985 psi | 88% | 3143 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,497 psi | 67% | 2910 fps | 96.2% |
| Lovex S065 | <<locked>> | 84% | 56,449 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,378 psi | 90% | 3068 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,942 psi | 88% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,566 psi | 89% | 3091 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,816 psi | 67% | 2940 fps | 98.4% |
| Norma MRP | <<locked>> | 90% | 55,492 psi | 85% | 3123 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 58,030 psi | 89% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,160 psi | 90% | 3163 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,188 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,043 psi | 88% | 3094 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,956 psi | 58% | 2067 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,289 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,665 psi | 84% | 3094 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,855 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,463 psi | 87% | 3150 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 90% | 58,030 psi | 89% | 3074 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 56,275 psi | 87% | 3084 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,885 psi | 89% | 3054 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,449 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,378 psi | 90% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,581 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,796 psi | 86% | 2969 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,854 psi | 86% | 3077 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 56,188 psi | 86% | 3002 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,216 psi | 85% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,811 psi | 87% | 3051 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,594 psi | 87% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,057 psi | 86% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,695 psi | 87% | 3031 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,463 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,071 psi | 85% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,143 psi | 85% | 3114 fps | 98% |
| Vihtavuori N565 | <<locked>> | 96% | 55,695 psi | 86% | 3094 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,884 psi | 88% | 3150 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,840 psi | 86% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,812 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,535 psi | 85% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,811 psi | 87% | 3045 fps | 99.3% |
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% | 36,564 psi | 56% | 2664 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,762 psi | 75% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,862 psi | 72% | 2959 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 40,379 psi | 62% | 2795 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 44,585 psi | 69% | 2910 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 43,453 psi | 67% | 2867 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 34,185 psi | 53% | 2694 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,354 psi | 71% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,215 psi | 83% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,582 psi | 62% | 2795 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,131 psi | 60% | 2789 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,056 psi | 54% | 2694 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,371 psi | 47% | 2585 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,044 psi | 60% | 2838 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,374 psi | 82% | 2999 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 38,928 psi | 60% | 2782 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 42,714 psi | 66% | 2881 fps | 96% |
| Bofors RP5 | <<locked>> | 82% | 39,131 psi | 60% | 2789 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,763 psi | 78% | 2940 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,408 psi | 64% | 2828 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 50,256 psi | 77% | 2986 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,547 psi | 81% | 3002 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,469 psi | 68% | 2854 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,717 psi | 72% | 2897 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,758 psi | 67% | 2822 fps | 100% |
| Hodgdon Retumbo | 84.5 gr | 86% | 36,506 psi | 56% | 2799 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 50,691 psi | 78% | 3009 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,151 psi | 71% | 2861 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,098 psi | 80% | 2966 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,224 psi | 71% | 2877 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,803 psi | 70% | 2854 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 43,004 psi | 66% | 2884 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,582 psi | 62% | 2848 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 49,777 psi | 77% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,109 psi | 74% | 2900 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,285 psi | 48% | 2533 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 46,586 psi | 72% | 2904 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,491 psi | 55% | 2746 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,421 psi | 59% | 2799 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 47,471 psi | 73% | 2920 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 43,076 psi | 66% | 2894 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 46,514 psi | 72% | 2913 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,810 psi | 55% | 2697 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,849 psi | 75% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,166 psi | 73% | 2969 fps | 99.9% |
| ReloadSwiss RS 76 | 90.4 gr | 86% | 36,056 psi | 55% | 2772 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 48,138 psi | 74% | 3005 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 41,742 psi | 64% | 2779 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 39,900 psi | 61% | 2779 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,763 psi | 78% | 2940 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,777 psi | 77% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,109 psi | 74% | 2900 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,940 psi | 85% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,689 psi | 75% | 2858 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,581 psi | 61% | 2772 fps | 95.7% |
| Somchem S361 | <<locked>> | 82% | 45,861 psi | 71% | 2822 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 44,643 psi | 69% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,509 psi | 62% | 2759 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,881 psi | 81% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,023 psi | 75% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,579 psi | 58% | 2684 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,472 psi | 75% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,233 psi | 60% | 2776 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 44,353 psi | 68% | 2913 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,976 psi | 69% | 2904 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 49,023 psi | 75% | 3015 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,428 psi | 75% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,430 psi | 78% | 2989 fps | 99.4% |
| Winchester StaBALL HD | 80.7 gr | 80% | 31,430 psi | 48% | 2707 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,929 psi | 61% | 2743 fps | 95.8% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Swift A-Frame. Hodgdon Retumbo delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:16.0 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.