Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 167gr | Sax KDG-S 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% | 56,898 psi | 88% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,450 psi | 88% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,637 psi | 86% | 3005 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 58,523 psi | 90% | 3005 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,478 psi | 87% | 3009 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2969 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,414 psi | 76% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,378 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,928 psi | 89% | 2992 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,782 psi | 87% | 3005 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,378 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,218 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,056 psi | 85% | 3005 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,769 psi | 89% | 2959 fps | 97.2% |
| Bofors RP15 | <<locked>> | 94% | 55,956 psi | 86% | 2992 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 3041 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,782 psi | 87% | 3005 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 55,303 psi | 85% | 2890 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 56,449 psi | 87% | 2995 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 55,056 psi | 85% | 2940 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,479 psi | 88% | 2956 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 56,144 psi | 86% | 2946 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,955 psi | 85% | 2927 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,697 psi | 90% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,014 psi | 88% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,999 psi | 86% | 2976 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 57% | 1913 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,305 psi | 88% | 2930 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,681 psi | 87% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,798 psi | 89% | 2936 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,869 psi | 88% | 2930 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 58,479 psi | 90% | 3048 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,730 psi | 69% | 2831 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 57,653 psi | 89% | 2913 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,043 psi | 86% | 2910 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,131 psi | 89% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,798 psi | 90% | 2989 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 45,339 psi | 70% | 2861 fps | 99.3% |
| Norma MRP | <<locked>> | 90% | 56,942 psi | 88% | 3025 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,724 psi | 86% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,506 psi | 85% | 3005 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 58,465 psi | 90% | 2986 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,523 psi | 90% | 2995 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 59% | 1955 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,783 psi | 89% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,101 psi | 86% | 2992 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,566 psi | 90% | 3107 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,957 psi | 89% | 3064 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,608 psi | 86% | 2920 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 57,609 psi | 89% | 2982 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,303 psi | 85% | 2890 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,653 psi | 89% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,043 psi | 86% | 2910 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,840 psi | 87% | 2864 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,174 psi | 88% | 2979 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 57,276 psi | 88% | 2904 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 56,550 psi | 87% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,044 psi | 89% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,667 psi | 89% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,276 psi | 88% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,957 psi | 89% | 2933 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,594 psi | 87% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,608 psi | 87% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,492 psi | 87% | 3022 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 57,029 psi | 88% | 3002 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,276 psi | 90% | 3061 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,085 psi | 85% | 3051 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,101 psi | 88% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,245 psi | 85% | 2943 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,392 psi | 88% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,291 psi | 90% | 2949 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% | 37,681 psi | 58% | 2585 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 50,067 psi | 77% | 2838 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,889 psi | 69% | 2815 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 41,582 psi | 64% | 2713 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 39,871 psi | 61% | 2700 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 38,783 psi | 60% | 2664 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 32,880 psi | 51% | 2566 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,674 psi | 73% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,655 psi | 64% | 2707 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,565 psi | 58% | 2648 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,245 psi | 56% | 2612 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,372 psi | 48% | 2520 fps | 97% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,466 psi | 62% | 2756 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,966 psi | 78% | 2848 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 37,347 psi | 57% | 2641 fps | 95.6% |
| Bofors RP30 | <<locked>> | 88% | 38,232 psi | 59% | 2680 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 37,565 psi | 58% | 2648 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 51,953 psi | 80% | 2838 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 36,999 psi | 57% | 2628 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 51,503 psi | 79% | 2887 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,824 psi | 83% | 2900 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,554 psi | 65% | 2707 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,785 psi | 64% | 2690 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,918 psi | 69% | 2723 fps | 100% |
| Hodgdon Retumbo | 78.9 gr | 84% | 35,012 psi | 54% | 2661 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 51,895 psi | 80% | 2913 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 43% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,384 psi | 73% | 2772 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,301 psi | 82% | 2864 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 47,384 psi | 73% | 2782 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,205 psi | 63% | 2651 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 84% | 41,234 psi | 63% | 2740 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,986 psi | 60% | 2713 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 50,937 psi | 78% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,313 psi | 76% | 2805 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 32,300 psi | 50% | 2461 fps | 96.6% |
| Norma 204 | <<locked>> | 80% | 47,761 psi | 74% | 2812 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 34,098 psi | 52% | 2618 fps | 96% |
| Norma MRP | <<locked>> | 80% | 39,537 psi | 61% | 2717 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 48,791 psi | 75% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,159 psi | 59% | 2680 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 47,703 psi | 73% | 2818 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 34,229 psi | 53% | 2559 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,543 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,285 psi | 77% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,530 psi | 75% | 2877 fps | 100% |
| ReloadSwiss RS 76 | 82.5 gr | 82% | 32,053 psi | 49% | 2569 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,322 psi | 65% | 2792 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 42,728 psi | 66% | 2690 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 40,973 psi | 63% | 2694 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 80% | 51,953 psi | 80% | 2838 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,937 psi | 78% | 2812 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,313 psi | 76% | 2805 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,763 psi | 77% | 2759 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,640 psi | 63% | 2687 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 43,787 psi | 67% | 2677 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 46,137 psi | 71% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,611 psi | 64% | 2674 fps | 98% |
| Vihtavuori N150 | <<locked>> | 80% | 54,157 psi | 83% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,227 psi | 77% | 2815 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,129 psi | 56% | 2546 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 49,603 psi | 76% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,451 psi | 62% | 2687 fps | 99.9% |
| Vihtavuori N560 | 80 gr | 82% | 42,540 psi | 65% | 2769 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 40,292 psi | 62% | 2700 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 46,847 psi | 72% | 2871 fps | 96% |
| Vihtavuori N570 | <<locked>> | 98% | 51,242 psi | 79% | 2986 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,676 psi | 76% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,692 psi | 80% | 2890 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,837 psi | 51% | 2638 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,159 psi | 59% | 2598 fps | 96.1% |
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 | 167gr | Sax KDG-S. Hodgdon Retumbo delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,114 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 167.0 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 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 | 167gr | Sax KDG-S 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.