Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 159gr | Hasler Bull bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Hodgdon Retumbo.
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% | 57,769 psi | 89% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,392 psi | 90% | 3022 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,898 psi | 88% | 3081 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 58,769 psi | 90% | 2986 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 56,028 psi | 86% | 3025 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 57,827 psi | 89% | 3087 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,083 psi | 80% | 2979 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,557 psi | 72% | 2933 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,115 psi | 86% | 3022 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,738 psi | 86% | 3028 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,087 psi | 88% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,434 psi | 85% | 3012 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,841 psi | 89% | 3077 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,448 psi | 85% | 2999 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,056 psi | 85% | 3051 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,159 psi | 86% | 3081 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,753 psi | 86% | 2979 fps | 96.3% |
| Bofors RP15 | <<locked>> | 96% | 56,985 psi | 88% | 3064 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 3048 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 57,841 psi | 89% | 3077 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 56,681 psi | 87% | 2972 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,885 psi | 89% | 3071 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 56,405 psi | 87% | 3022 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,114 psi | 85% | 2979 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 57,551 psi | 89% | 3025 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,289 psi | 87% | 3002 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,956 psi | 86% | 2946 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,928 psi | 89% | 3186 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,653 psi | 89% | 3058 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 57% | 1959 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,100 psi | 85% | 2956 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,247 psi | 90% | 2999 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,042 psi | 85% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,160 psi | 90% | 3005 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 55,796 psi | 86% | 3061 fps | 98.8% |
| Lovex S065 | <<locked>> | 84% | 55,230 psi | 85% | 2940 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,203 psi | 88% | 2986 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,013 psi | 85% | 2946 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,362 psi | 87% | 3012 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 42,148 psi | 65% | 2854 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 58,131 psi | 89% | 3100 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,884 psi | 88% | 3005 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,826 psi | 87% | 3081 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 55,927 psi | 86% | 3009 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,434 psi | 85% | 3012 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 58% | 2001 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,795 psi | 84% | 2986 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,551 psi | 89% | 3071 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,274 psi | 85% | 3117 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,462 psi | 84% | 3061 fps | 98% |
| Rottweil R 903 | <<locked>> | 82% | 57,957 psi | 89% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,898 psi | 88% | 2992 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 58,697 psi | 90% | 3058 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 56,681 psi | 87% | 2972 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,230 psi | 85% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,203 psi | 88% | 2986 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,624 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,247 psi | 90% | 2943 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,262 psi | 90% | 3054 fps | 99.7% |
| Somchem S355 | <<locked>> | 82% | 57,566 psi | 89% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,769 psi | 90% | 2982 fps | 98.6% |
| Somchem S365 | <<locked>> | 88% | 57,711 psi | 89% | 3005 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,317 psi | 85% | 2969 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,230 psi | 85% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,566 psi | 90% | 2995 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,274 psi | 85% | 2953 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 57,870 psi | 89% | 3002 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,276 psi | 88% | 3022 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,798 psi | 89% | 3097 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 57,972 psi | 89% | 3074 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,042 psi | 85% | 3068 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,682 psi | 90% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,608 psi | 87% | 3025 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,305 psi | 90% | 3130 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,622 psi | 86% | 2966 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% | 35,099 psi | 54% | 2582 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 47,268 psi | 73% | 2854 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,585 psi | 70% | 2884 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 55,216 psi | 85% | 2936 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,465 psi | 61% | 2723 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 43,468 psi | 67% | 2828 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 42,105 psi | 65% | 2789 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 33,011 psi | 51% | 2615 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,856 psi | 61% | 2723 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,324 psi | 70% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,982 psi | 82% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,494 psi | 61% | 2717 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,869 psi | 58% | 2707 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,765 psi | 52% | 2612 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,341 psi | 45% | 2510 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,565 psi | 58% | 2753 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,286 psi | 80% | 2923 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 37,695 psi | 58% | 2700 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 41,234 psi | 63% | 2799 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 37,869 psi | 58% | 2707 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 49,734 psi | 77% | 2861 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 40,147 psi | 62% | 2749 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 49,197 psi | 76% | 2907 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 51,576 psi | 79% | 2923 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 43,279 psi | 67% | 2776 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,614 psi | 70% | 2822 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,598 psi | 66% | 2740 fps | 100% |
| Hodgdon Retumbo | 83.4 gr | 88% | 37,913 psi | 58% | 2785 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 49,400 psi | 76% | 2927 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 42% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,281 psi | 70% | 2789 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,256 psi | 79% | 2890 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 44,904 psi | 69% | 2795 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,788 psi | 69% | 2776 fps | 95.8% |
| IMR 7828 SSC | 81.4 gr | 86% | 41,814 psi | 64% | 2805 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 48,515 psi | 75% | 2831 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,007 psi | 72% | 2822 fps | 99.2% |
| Lovex S071 | <<locked>> | 82% | 32,111 psi | 49% | 2507 fps | 96% |
| Norma 204 | <<locked>> | 80% | 45,469 psi | 70% | 2825 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 33,895 psi | 52% | 2661 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 37,144 psi | 57% | 2717 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 46,398 psi | 71% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 41,800 psi | 64% | 2815 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 45,310 psi | 70% | 2831 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 34,447 psi | 53% | 2615 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1798 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,514 psi | 73% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,919 psi | 71% | 2890 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,722 psi | 53% | 2690 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,224 psi | 71% | 2920 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 54,346 psi | 84% | 2920 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,654 psi | 63% | 2700 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 38,696 psi | 60% | 2697 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 49,734 psi | 77% | 2861 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,515 psi | 75% | 2831 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,007 psi | 72% | 2822 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,056 psi | 83% | 2799 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,703 psi | 73% | 2782 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,363 psi | 59% | 2694 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 53,882 psi | 83% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,614 psi | 69% | 2746 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 43,482 psi | 67% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,262 psi | 60% | 2680 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,808 psi | 80% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,848 psi | 74% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,506 psi | 56% | 2608 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 47,181 psi | 73% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,869 psi | 58% | 2690 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 43,149 psi | 66% | 2838 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 43,453 psi | 67% | 2818 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 47,413 psi | 73% | 2933 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,297 psi | 73% | 2789 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,197 psi | 76% | 2907 fps | 99.4% |
| Winchester StaBALL HD | 77.8 gr | 80% | 30,037 psi | 46% | 2618 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,624 psi | 59% | 2661 fps | 95.7% |
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 75 powders for .300 Rem. Ultra Mag. loaded with the .308 | 159gr | Hasler Bull. Hodgdon Retumbo delivers the highest muzzle velocity at 3,186 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,186 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 159.0 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, Bofors RP30 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, IMR 7828 SSC, Hodgdon Retumbo rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 159gr | Hasler Bull 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.