Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 154gr | Hasler Hunting bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand and Alliant Reloder-26.
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% | 56,579 psi | 87% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,493 psi | 88% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,666 psi | 86% | 3094 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 57,943 psi | 89% | 3012 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,998 psi | 85% | 3048 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 56,826 psi | 87% | 3107 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,155 psi | 79% | 2992 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,658 psi | 70% | 2946 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,624 psi | 90% | 3107 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,970 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,204 psi | 90% | 3091 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,826 psi | 87% | 3097 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,218 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,030 psi | 89% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,810 psi | 84% | 3097 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 58,711 psi | 90% | 3061 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 55,782 psi | 86% | 3081 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 3064 fps | 98.7% |
| Bofors RP5 | <<locked>> | 94% | 56,826 psi | 87% | 3097 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 55,825 psi | 86% | 2995 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,594 psi | 87% | 3087 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 55,390 psi | 85% | 3045 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 57,957 psi | 89% | 3061 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,637 psi | 87% | 3045 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,434 psi | 85% | 3025 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,940 psi | 85% | 2969 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 56,753 psi | 87% | 3202 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,478 psi | 87% | 3077 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,912 psi | 57% | 1985 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,885 psi | 89% | 3035 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,392 psi | 88% | 3022 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 57,841 psi | 89% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,377 psi | 88% | 3028 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 58,697 psi | 90% | 3143 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 58,044 psi | 89% | 3015 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,304 psi | 87% | 3012 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,332 psi | 85% | 3031 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 41,191 psi | 63% | 2864 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 56,840 psi | 87% | 3120 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 55,869 psi | 86% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,463 psi | 85% | 3097 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 86% | 54,926 psi | 85% | 3031 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 58,798 psi | 90% | 3094 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 58% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,972 psi | 89% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,565 psi | 87% | 3097 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,142 psi | 82% | 3074 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 57,014 psi | 88% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,898 psi | 86% | 3012 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 57,769 psi | 89% | 3077 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 55,825 psi | 86% | 2995 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,044 psi | 89% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,304 psi | 87% | 3012 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,855 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,348 psi | 88% | 2966 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,319 psi | 88% | 3077 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 56,695 psi | 87% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,914 psi | 89% | 3002 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 56,565 psi | 87% | 3028 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,262 psi | 90% | 3048 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 58,189 psi | 90% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,740 psi | 89% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,059 psi | 89% | 3025 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 56,840 psi | 87% | 3022 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,130 psi | 86% | 3045 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,550 psi | 87% | 3114 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 56,666 psi | 87% | 3087 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 53,853 psi | 83% | 3081 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,827 psi | 89% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,579 psi | 86% | 3045 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 56,855 psi | 88% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 58,711 psi | 90% | 3045 fps | 99.5% |
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% | 34,360 psi | 53% | 2592 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 46,354 psi | 71% | 2871 fps | 99.9% |
| Accurate MAGPRO | 88.5 gr | 88% | 48,008 psi | 74% | 2963 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 54,433 psi | 84% | 2963 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,740 psi | 60% | 2736 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 86% | 42,612 psi | 66% | 2844 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 94% | 41,394 psi | 64% | 2802 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 92% | 34,592 psi | 53% | 2687 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,469 psi | 68% | 2884 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,982 psi | 80% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,769 psi | 60% | 2730 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,827 psi | 61% | 2785 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,025 psi | 51% | 2628 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,850 psi | 47% | 2585 fps | 95.8% |
| Alliant Reloder-26 | 81.4 gr | 80% | 36,767 psi | 57% | 2766 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,013 psi | 85% | 2999 fps | 95.8% |
| Bofors RP15 | <<locked>> | 86% | 39,610 psi | 61% | 2779 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 40,205 psi | 62% | 2808 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 39,827 psi | 61% | 2785 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 48,994 psi | 75% | 2881 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 39,436 psi | 61% | 2762 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 48,341 psi | 74% | 2927 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 50,734 psi | 78% | 2943 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 45,730 psi | 70% | 2854 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,744 psi | 69% | 2835 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,814 psi | 64% | 2759 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,057 psi | 57% | 2792 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,370 psi | 74% | 2943 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 42% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,541 psi | 69% | 2808 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,517 psi | 78% | 2910 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 44,092 psi | 68% | 2815 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,048 psi | 68% | 2792 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 88% | 43,990 psi | 68% | 2884 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 47,776 psi | 74% | 2854 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,238 psi | 71% | 2841 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,430 psi | 48% | 2520 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 44,817 psi | 69% | 2844 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 35,520 psi | 55% | 2730 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,289 psi | 56% | 2726 fps | 96% |
| Norma URP | <<locked>> | 80% | 45,571 psi | 70% | 2864 fps | 99.9% |
| Ramshot Grand | 84.2 gr | 86% | 40,828 psi | 63% | 2825 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 44,628 psi | 69% | 2854 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 36,535 psi | 56% | 2694 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 43% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,615 psi | 72% | 2890 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,947 psi | 69% | 2907 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,040 psi | 52% | 2700 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,136 psi | 69% | 2927 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 53,417 psi | 82% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,844 psi | 66% | 2779 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 37,942 psi | 58% | 2710 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 48,994 psi | 75% | 2881 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,776 psi | 74% | 2854 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,238 psi | 71% | 2841 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,316 psi | 82% | 2825 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,978 psi | 72% | 2802 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,608 psi | 58% | 2707 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,026 psi | 82% | 2940 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,816 psi | 67% | 2759 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 42,569 psi | 66% | 2815 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,522 psi | 59% | 2694 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 50,995 psi | 78% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,021 psi | 72% | 2858 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 82% | 35,766 psi | 55% | 2621 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 46,369 psi | 71% | 2858 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,072 psi | 57% | 2707 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 45,484 psi | 70% | 2917 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 90% | 42,641 psi | 66% | 2835 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 96% | 46,369 psi | 71% | 2943 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,427 psi | 71% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,341 psi | 74% | 2927 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,457 psi | 45% | 2631 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,000 psi | 58% | 2677 fps | 95.2% |
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 79 powders for .300 Rem. Ultra Mag. loaded with the .308 | 154gr | Hasler Hunting. Hodgdon Retumbo delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,202 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 154.0 gr projectile in 0.308" calls for a 1:12.0 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. Accurate MAGPRO, Ramshot Grand, Alliant Reloder-26 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 154gr | Hasler Hunting they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.