Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 156gr | Reichenbeg HDB Ogival 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, Alliant Reloder-26 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% | 57,174 psi | 88% | 2995 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,870 psi | 89% | 3038 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,289 psi | 87% | 3091 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 58,421 psi | 90% | 3005 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,332 psi | 85% | 3038 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 57,435 psi | 88% | 3100 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,547 psi | 79% | 2989 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,195 psi | 71% | 2946 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,216 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,347 psi | 87% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,755 psi | 90% | 3084 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,464 psi | 88% | 3094 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,653 psi | 90% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,697 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,477 psi | 85% | 3091 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,317 psi | 85% | 2992 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 56,391 psi | 87% | 3077 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,418 psi | 84% | 3061 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 57,464 psi | 88% | 3094 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 56,289 psi | 87% | 2989 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,261 psi | 88% | 3084 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 55,898 psi | 86% | 3035 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 58,479 psi | 90% | 3051 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,000 psi | 88% | 3035 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,767 psi | 86% | 3015 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,492 psi | 85% | 2963 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,421 psi | 88% | 3199 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,072 psi | 88% | 3071 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 57% | 1975 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,392 psi | 90% | 3025 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,841 psi | 89% | 3015 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 58,407 psi | 90% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,696 psi | 89% | 3018 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,187 psi | 85% | 3074 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 58,523 psi | 90% | 3009 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,594 psi | 87% | 2999 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,233 psi | 90% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,883 psi | 86% | 3025 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,568 psi | 64% | 2861 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 57,479 psi | 88% | 3117 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,231 psi | 87% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,130 psi | 86% | 3094 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 55,434 psi | 85% | 3022 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,723 psi | 84% | 3022 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 58% | 2018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,363 psi | 90% | 3058 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,956 psi | 88% | 3087 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,520 psi | 84% | 3123 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,867 psi | 83% | 3071 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 57,551 psi | 89% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,391 psi | 87% | 3009 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 58,146 psi | 89% | 3071 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,289 psi | 87% | 2989 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,523 psi | 90% | 3009 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,594 psi | 87% | 2999 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,087 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,827 psi | 89% | 2959 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,711 psi | 89% | 3064 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,174 psi | 88% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,450 psi | 90% | 2995 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 57,174 psi | 88% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,610 psi | 90% | 3038 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 58,668 psi | 90% | 2949 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,102 psi | 89% | 3012 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,639 psi | 90% | 3018 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 57,406 psi | 88% | 3015 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,710 psi | 87% | 3038 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,174 psi | 88% | 3110 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 57,334 psi | 88% | 3084 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,549 psi | 84% | 3077 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,160 psi | 90% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,101 psi | 86% | 3041 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,421 psi | 88% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,071 psi | 85% | 2979 fps | 99.2% |
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% | 34,766 psi | 54% | 2592 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 46,833 psi | 72% | 2864 fps | 100% |
| Accurate MAGPRO | 86.5 gr | 86% | 45,092 psi | 69% | 2890 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 54,694 psi | 84% | 2949 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,972 psi | 60% | 2730 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 43,062 psi | 66% | 2841 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 41,698 psi | 64% | 2795 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 90% | 32,663 psi | 50% | 2621 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,933 psi | 69% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,518 psi | 81% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,146 psi | 60% | 2726 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,507 psi | 58% | 2720 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,431 psi | 51% | 2621 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,096 psi | 48% | 2579 fps | 96.1% |
| Alliant Reloder-26 | 81.3 gr | 80% | 37,115 psi | 57% | 2759 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,837 psi | 80% | 2933 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 39,914 psi | 61% | 2772 fps | 95.9% |
| Bofors RP30 | <<locked>> | 92% | 40,727 psi | 63% | 2808 fps | 95.6% |
| Bofors RP5 | <<locked>> | 82% | 37,507 psi | 58% | 2720 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 49,414 psi | 76% | 2877 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 39,740 psi | 61% | 2756 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,631 psi | 75% | 2917 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 51,169 psi | 79% | 2936 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,050 psi | 71% | 2848 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,208 psi | 70% | 2831 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,250 psi | 65% | 2756 fps | 100% |
| Hodgdon Retumbo | 83.7 gr | 88% | 37,492 psi | 58% | 2792 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 48,878 psi | 75% | 2940 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 42% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,788 psi | 69% | 2799 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,749 psi | 78% | 2900 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,541 psi | 69% | 2812 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,454 psi | 68% | 2789 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 41,408 psi | 64% | 2815 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,196 psi | 74% | 2848 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,514 psi | 72% | 2835 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,676 psi | 49% | 2513 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 45,092 psi | 69% | 2835 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 35,998 psi | 55% | 2730 fps | 96% |
| Norma MRP | <<locked>> | 80% | 36,593 psi | 56% | 2723 fps | 96.3% |
| Norma URP | <<locked>> | 80% | 45,847 psi | 71% | 2851 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,336 psi | 64% | 2822 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,933 psi | 69% | 2844 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 36,811 psi | 57% | 2690 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 43% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,094 psi | 72% | 2884 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,469 psi | 70% | 2904 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,330 psi | 53% | 2697 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,759 psi | 70% | 2930 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 53,722 psi | 83% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,120 psi | 66% | 2772 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,334 psi | 59% | 2710 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 49,414 psi | 76% | 2877 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,196 psi | 74% | 2848 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,514 psi | 72% | 2835 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,563 psi | 82% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,210 psi | 73% | 2792 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,014 psi | 59% | 2703 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 53,505 psi | 82% | 2930 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,237 psi | 68% | 2756 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 42,902 psi | 66% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,914 psi | 60% | 2690 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,271 psi | 79% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,485 psi | 73% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,027 psi | 55% | 2615 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 46,818 psi | 72% | 2848 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,507 psi | 58% | 2703 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 86% | 46,006 psi | 71% | 2913 fps | 96% |
| Vihtavuori N565 | <<locked>> | 90% | 42,960 psi | 66% | 2828 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 96% | 46,760 psi | 72% | 2940 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,905 psi | 72% | 2802 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,805 psi | 75% | 2920 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 29,704 psi | 46% | 2625 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,276 psi | 59% | 2671 fps | 95.4% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 156gr | Reichenbeg HDB Ogival. Hodgdon Retumbo delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,199 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 156.0 gr projectile in 0.308" calls for a 1:12.5 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. Accurate MAGPRO, Alliant Reloder-26, Hodgdon Retumbo rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 156gr | Reichenbeg HDB Ogival 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.