Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 156gr | Reichenberg 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 Alliant Reloder-26, Hodgdon Retumbo and Winchester StaBALL HD.
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% | 57,363 psi | 88% | 2999 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,117 psi | 89% | 3038 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,449 psi | 87% | 3097 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 58,392 psi | 90% | 3002 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,521 psi | 85% | 3041 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 57,435 psi | 88% | 3100 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,663 psi | 80% | 2992 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,354 psi | 71% | 2946 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,434 psi | 85% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,536 psi | 87% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,143 psi | 85% | 3028 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,450 psi | 88% | 3094 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,882 psi | 84% | 3012 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,668 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,680 psi | 86% | 3094 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,419 psi | 85% | 2995 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 56,594 psi | 87% | 3081 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,549 psi | 84% | 3064 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 57,450 psi | 88% | 3094 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 56,275 psi | 87% | 2989 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,392 psi | 88% | 3084 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 56,115 psi | 86% | 3038 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 58,653 psi | 90% | 3058 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,203 psi | 88% | 3038 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,941 psi | 86% | 3018 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,680 psi | 86% | 2966 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3202 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,029 psi | 88% | 3071 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 57% | 1972 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,392 psi | 90% | 3025 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,841 psi | 89% | 3012 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 58,378 psi | 90% | 3028 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,885 psi | 89% | 3022 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,405 psi | 85% | 3077 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 58,523 psi | 90% | 3009 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,782 psi | 87% | 3002 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,854 psi | 86% | 3025 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,742 psi | 64% | 2864 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 57,682 psi | 89% | 3117 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,420 psi | 87% | 3022 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,347 psi | 87% | 3097 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 55,434 psi | 85% | 3025 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,911 psi | 85% | 3025 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 58% | 2018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,537 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,174 psi | 88% | 3091 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,708 psi | 84% | 3130 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,041 psi | 83% | 3074 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 57,740 psi | 89% | 2989 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,594 psi | 87% | 3012 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 58,363 psi | 90% | 3074 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,275 psi | 87% | 2989 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,523 psi | 90% | 3009 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,782 psi | 87% | 3002 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,305 psi | 88% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,030 psi | 89% | 2963 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,928 psi | 89% | 3071 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,174 psi | 88% | 2982 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,421 psi | 90% | 2995 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 57,159 psi | 88% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,984 psi | 85% | 2986 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 58,682 psi | 90% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,305 psi | 90% | 3015 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,784 psi | 90% | 3022 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 57,595 psi | 89% | 3018 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,913 psi | 88% | 3041 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,377 psi | 88% | 3114 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 98% | 57,464 psi | 88% | 3087 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,723 psi | 84% | 3081 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,363 psi | 90% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,318 psi | 87% | 3045 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,609 psi | 89% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,274 psi | 85% | 2982 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% | 34,766 psi | 54% | 2592 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 46,862 psi | 72% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,092 psi | 69% | 2890 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 54,882 psi | 84% | 2953 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,146 psi | 60% | 2733 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 43,221 psi | 67% | 2844 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 41,829 psi | 64% | 2799 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 32,677 psi | 50% | 2621 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,962 psi | 69% | 2877 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,533 psi | 81% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,175 psi | 60% | 2726 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,521 psi | 58% | 2720 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,591 psi | 52% | 2625 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,212 psi | 48% | 2582 fps | 96.1% |
| Alliant Reloder-26 | 81.5 gr | 80% | 37,289 psi | 57% | 2766 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,982 psi | 80% | 2933 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 40,059 psi | 62% | 2776 fps | 96% |
| Bofors RP30 | <<locked>> | 92% | 40,872 psi | 63% | 2812 fps | 95.6% |
| Bofors RP5 | <<locked>> | 82% | 37,521 psi | 58% | 2720 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 49,414 psi | 76% | 2874 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 39,885 psi | 61% | 2759 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,805 psi | 75% | 2920 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,198 psi | 79% | 2936 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,209 psi | 71% | 2851 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,353 psi | 70% | 2835 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,264 psi | 65% | 2753 fps | 100% |
| Hodgdon Retumbo | 83.8 gr | 88% | 37,507 psi | 58% | 2795 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 48,892 psi | 75% | 2940 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 42% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,962 psi | 69% | 2802 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,937 psi | 78% | 2904 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,570 psi | 69% | 2812 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,599 psi | 69% | 2792 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 41,423 psi | 64% | 2815 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 48,370 psi | 74% | 2851 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,688 psi | 72% | 2835 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 31,821 psi | 49% | 2516 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 45,252 psi | 70% | 2841 fps | 97.3% |
| Norma 217 | <<locked>> | 96% | 36,143 psi | 56% | 2736 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 36,738 psi | 57% | 2726 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,035 psi | 71% | 2858 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,321 psi | 64% | 2822 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 45,107 psi | 69% | 2851 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 36,970 psi | 57% | 2694 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 43% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,108 psi | 73% | 2884 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,469 psi | 70% | 2900 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,461 psi | 53% | 2700 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,934 psi | 71% | 2930 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 53,954 psi | 83% | 2936 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,279 psi | 67% | 2776 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,363 psi | 59% | 2710 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 49,414 psi | 76% | 2874 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,370 psi | 74% | 2851 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,688 psi | 72% | 2835 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,780 psi | 83% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,398 psi | 73% | 2795 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,043 psi | 59% | 2703 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 53,679 psi | 83% | 2933 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,396 psi | 68% | 2759 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 43,091 psi | 66% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,928 psi | 60% | 2690 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 51,459 psi | 79% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,485 psi | 73% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,158 psi | 56% | 2618 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 46,818 psi | 72% | 2851 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,521 psi | 58% | 2703 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 84% | 42,888 psi | 66% | 2851 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 43,149 psi | 66% | 2831 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 46,934 psi | 72% | 2943 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,079 psi | 72% | 2805 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,994 psi | 75% | 2923 fps | 99.3% |
| Winchester StaBALL HD | 78.3 gr | 80% | 29,849 psi | 46% | 2631 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,450 psi | 59% | 2674 fps | 95.5% |
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 | 156gr | Reichenberg HDB Ogival. Hodgdon Retumbo delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 1,972 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 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. Alliant Reloder-26, Hodgdon Retumbo, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 156gr | Reichenberg HDB Ogival 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.