Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 154gr | Hammer HHT bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,825 psi | 86% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,652 psi | 87% | 3035 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,737 psi | 84% | 3081 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,319 psi | 88% | 3005 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 58,001 psi | 89% | 3091 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 55,941 psi | 86% | 3091 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,372 psi | 78% | 2979 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,933 psi | 69% | 2933 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 58,204 psi | 90% | 3087 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,740 psi | 90% | 3025 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,754 psi | 89% | 3097 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,114 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,479 psi | 88% | 3077 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,927 psi | 86% | 3084 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,232 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 57,029 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 58,363 psi | 90% | 3150 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,870 psi | 89% | 3045 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 55,100 psi | 85% | 3071 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,852 psi | 81% | 3051 fps | 98.5% |
| Bofors RP5 | <<locked>> | 94% | 55,927 psi | 86% | 3084 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 55,259 psi | 85% | 2986 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,796 psi | 86% | 3074 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 86% | 58,682 psi | 90% | 3091 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,406 psi | 88% | 3051 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 55,767 psi | 86% | 3028 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,508 psi | 90% | 3071 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 58,059 psi | 89% | 3012 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,811 psi | 86% | 3189 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 55,738 psi | 86% | 3068 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,159 psi | 88% | 3022 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,826 psi | 87% | 3012 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 57,043 psi | 88% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,565 psi | 87% | 3012 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 57,725 psi | 89% | 3127 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 57,276 psi | 88% | 3005 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,535 psi | 85% | 2999 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3005 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,537 psi | 90% | 3077 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 40,350 psi | 62% | 2848 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 55,869 psi | 86% | 3107 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 55,056 psi | 85% | 3018 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,491 psi | 84% | 3081 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 57,943 psi | 89% | 3074 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,638 psi | 89% | 3077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,579 psi | 58% | 2024 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,798 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,956 psi | 88% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,521 psi | 85% | 3084 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,319 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 3058 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 82% | 56,362 psi | 87% | 2986 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,187 psi | 85% | 3002 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 92% | 56,826 psi | 87% | 3064 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,259 psi | 85% | 2986 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,276 psi | 88% | 3005 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,535 psi | 85% | 2999 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 58,450 psi | 90% | 3048 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,231 psi | 87% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,826 psi | 87% | 2959 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,391 psi | 87% | 3061 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 56,057 psi | 86% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,159 psi | 88% | 2989 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 55,680 psi | 86% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,348 psi | 88% | 3035 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,580 psi | 89% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,971 psi | 88% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,174 psi | 88% | 3012 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 56,115 psi | 86% | 3012 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,274 psi | 85% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,622 psi | 86% | 3100 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 55,796 psi | 86% | 3074 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,982 psi | 82% | 3068 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,942 psi | 88% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,998 psi | 85% | 3038 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,651 psi | 86% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,870 psi | 89% | 3035 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% | 33,823 psi | 52% | 2579 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 45,701 psi | 70% | 2861 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 47,152 psi | 73% | 2946 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,809 psi | 83% | 2953 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,915 psi | 63% | 2785 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 42,119 psi | 65% | 2831 fps | 95% |
| ADI AR 2217 | <<locked>> | 96% | 43,729 psi | 67% | 2851 fps | 96% |
| ADI AR 2225 | <<locked>> | 92% | 34,084 psi | 52% | 2671 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,580 psi | 59% | 2726 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 55,143 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,801 psi | 67% | 2871 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,097 psi | 79% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,232 psi | 59% | 2720 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 39,305 psi | 60% | 2776 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,619 psi | 50% | 2615 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,298 psi | 47% | 2566 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,042 psi | 55% | 2749 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 54,215 psi | 83% | 2982 fps | 95.5% |
| Bofors RP15 | <<locked>> | 86% | 38,943 psi | 60% | 2766 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 42,554 psi | 65% | 2861 fps | 96% |
| Bofors RP5 | <<locked>> | 84% | 39,305 psi | 60% | 2776 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,414 psi | 75% | 2871 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 41,640 psi | 64% | 2812 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 47,558 psi | 73% | 2910 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 50,169 psi | 77% | 2933 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 45,078 psi | 69% | 2841 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,237 psi | 68% | 2825 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,162 psi | 63% | 2749 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,463 psi | 56% | 2779 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 47,630 psi | 73% | 2930 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 42% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,005 psi | 68% | 2795 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,951 psi | 77% | 2900 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 43,482 psi | 67% | 2805 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,584 psi | 67% | 2782 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 43,323 psi | 67% | 2871 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,369 psi | 73% | 2848 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 45,672 psi | 70% | 2831 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 30,893 psi | 48% | 2507 fps | 95% |
| Norma 204 | <<locked>> | 80% | 44,106 psi | 68% | 2831 fps | 96.8% |
| Norma 217 | <<locked>> | 96% | 34,925 psi | 54% | 2717 fps | 95.3% |
| Norma MRP | 78 gr | 80% | 35,607 psi | 55% | 2713 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 44,947 psi | 69% | 2851 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 43,308 psi | 67% | 2877 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 43,918 psi | 68% | 2841 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 35,766 psi | 55% | 2677 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,447 psi | 84% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,992 psi | 71% | 2881 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,367 psi | 68% | 2897 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,998 psi | 55% | 2756 fps | 96.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 48,022 psi | 74% | 2986 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 52,779 psi | 81% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,337 psi | 65% | 2769 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 40,219 psi | 62% | 2762 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 48,414 psi | 75% | 2871 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,369 psi | 73% | 2848 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 45,672 psi | 70% | 2831 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,462 psi | 84% | 2992 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,692 psi | 81% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,296 psi | 71% | 2785 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,871 psi | 61% | 2756 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 52,605 psi | 81% | 2933 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 46,383 psi | 71% | 2808 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 41,916 psi | 65% | 2802 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,000 psi | 58% | 2684 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 80% | 50,386 psi | 78% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,427 psi | 71% | 2848 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 37,768 psi | 58% | 2664 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 45,803 psi | 70% | 2844 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 36,448 psi | 56% | 2694 fps | 99% |
| Vihtavuori N560 | 83.9 gr | 86% | 44,788 psi | 69% | 2904 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 92% | 44,918 psi | 69% | 2881 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 49,008 psi | 75% | 2995 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,934 psi | 71% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,732 psi | 73% | 2913 fps | 99% |
| Winchester StaBALL HD | 77.2 gr | 80% | 28,877 psi | 44% | 2612 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,190 psi | 62% | 2726 fps | 95.9% |
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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 154gr | Hammer HHT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,189 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,189 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:11.5 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, Vihtavuori N560, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 154gr | Hammer HHT 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.