Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Reichenberg HDB KUHS bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N560.
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>> | 92% | 56,231 psi | 87% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,971 psi | 88% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,376 psi | 85% | 2995 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 58,349 psi | 90% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,449 psi | 87% | 3005 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,708 psi | 84% | 2966 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,081 psi | 76% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,131 psi | 89% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,682 psi | 89% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,594 psi | 87% | 2995 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,030 psi | 89% | 2963 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,088 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,781 psi | 84% | 2992 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,667 psi | 89% | 2959 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 55,767 psi | 86% | 2982 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,827 psi | 89% | 3035 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,594 psi | 87% | 2995 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,668 psi | 90% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,289 psi | 87% | 2989 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 58,668 psi | 90% | 2989 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,174 psi | 88% | 2949 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 55,883 psi | 86% | 2940 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,784 psi | 90% | 2982 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,262 psi | 90% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,898 psi | 88% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,738 psi | 86% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 57% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,145 psi | 88% | 2923 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,594 psi | 87% | 2910 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,276 psi | 88% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,637 psi | 87% | 2927 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 58,421 psi | 90% | 3041 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,324 psi | 68% | 2818 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 57,188 psi | 88% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,564 psi | 86% | 2900 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,711 psi | 89% | 2923 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,581 psi | 90% | 2982 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,744 psi | 69% | 2848 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 56,550 psi | 87% | 3015 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,288 psi | 85% | 2920 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,448 psi | 85% | 2999 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 58,233 psi | 90% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,262 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1955 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,406 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,912 psi | 86% | 2986 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,262 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,711 psi | 89% | 3054 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,390 psi | 85% | 2910 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 57,290 psi | 88% | 2976 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,668 psi | 90% | 2940 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,188 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,564 psi | 86% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,376 psi | 87% | 2858 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,898 psi | 88% | 2969 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,116 psi | 88% | 2897 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 56,260 psi | 87% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,798 psi | 89% | 2946 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,276 psi | 88% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,072 psi | 88% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,624 psi | 89% | 2923 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,260 psi | 87% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,086 psi | 86% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,202 psi | 86% | 3012 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 96% | 56,637 psi | 87% | 2992 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 3054 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,940 psi | 85% | 3045 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,884 psi | 88% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,042 psi | 85% | 2940 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,232 psi | 88% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,957 psi | 89% | 2940 fps | 99.8% |
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% | 36,840 psi | 57% | 2566 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 49,400 psi | 76% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,425 psi | 68% | 2802 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,234 psi | 63% | 2703 fps | 97.1% |
| ADI AR 2213 | <<locked>> | 82% | 39,421 psi | 61% | 2687 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 38,363 psi | 59% | 2654 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 32,329 psi | 50% | 2546 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,398 psi | 73% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,234 psi | 63% | 2697 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,999 psi | 57% | 2635 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,563 psi | 55% | 2595 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,792 psi | 47% | 2503 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,958 psi | 61% | 2740 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,836 psi | 78% | 2844 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 36,796 psi | 57% | 2625 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 37,565 psi | 58% | 2664 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 36,999 psi | 57% | 2635 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 51,532 psi | 79% | 2831 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 36,550 psi | 56% | 2615 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 51,271 psi | 79% | 2881 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,519 psi | 82% | 2894 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,105 psi | 65% | 2697 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,336 psi | 64% | 2680 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,512 psi | 69% | 2710 fps | 100% |
| Hodgdon Retumbo | 79.8 gr | 84% | 34,563 psi | 53% | 2648 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 51,634 psi | 79% | 2904 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,789 psi | 43% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,036 psi | 72% | 2762 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,026 psi | 82% | 2858 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 46,847 psi | 72% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,799 psi | 63% | 2641 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 84% | 40,770 psi | 63% | 2730 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,421 psi | 59% | 2697 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 50,299 psi | 77% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,820 psi | 75% | 2795 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 31,473 psi | 48% | 2438 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 47,543 psi | 73% | 2805 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 33,460 psi | 51% | 2595 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 39,102 psi | 60% | 2703 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 48,370 psi | 74% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,710 psi | 58% | 2667 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 47,427 psi | 73% | 2812 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,678 psi | 52% | 2543 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,413 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,719 psi | 77% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,124 psi | 74% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 82% | 31,488 psi | 48% | 2549 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,814 psi | 64% | 2772 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 42,322 psi | 65% | 2680 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 40,495 psi | 62% | 2680 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 51,532 psi | 79% | 2831 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,299 psi | 77% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,820 psi | 75% | 2795 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,458 psi | 76% | 2753 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,176 psi | 62% | 2677 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 43,265 psi | 67% | 2664 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 45,614 psi | 70% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,017 psi | 63% | 2661 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 53,722 psi | 83% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,821 psi | 77% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,578 psi | 55% | 2533 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 49,110 psi | 76% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,798 psi | 61% | 2671 fps | 99.9% |
| Vihtavuori N560 | 80.8 gr | 82% | 42,018 psi | 65% | 2756 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 39,668 psi | 61% | 2684 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 46,485 psi | 72% | 2861 fps | 96% |
| Vihtavuori N570 | <<locked>> | 98% | 50,894 psi | 78% | 2972 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,240 psi | 76% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,271 psi | 79% | 2881 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,372 psi | 50% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,623 psi | 58% | 2585 fps | 96% |
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 | 168gr | Reichenberg HDB KUHS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,107 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 168.0 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 2218, ADI AR 2225 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Reichenberg HDB KUHS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.