Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Reichenberg HDB Universal bullet and 72 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% | 56,115 psi | 86% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,840 psi | 87% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,317 psi | 85% | 2995 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 58,276 psi | 90% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,347 psi | 87% | 3002 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,621 psi | 84% | 2963 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,008 psi | 75% | 2920 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 58,508 psi | 90% | 2995 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,204 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,769 psi | 89% | 2986 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,536 psi | 87% | 2999 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,914 psi | 89% | 2963 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,986 psi | 89% | 3028 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,665 psi | 84% | 2992 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,783 psi | 89% | 2963 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 55,666 psi | 86% | 2982 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,725 psi | 89% | 3031 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 56,536 psi | 87% | 2999 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,581 psi | 90% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,202 psi | 86% | 2989 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 58,755 psi | 90% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,087 psi | 88% | 2946 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 55,782 psi | 86% | 2936 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,726 psi | 90% | 2982 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,363 psi | 90% | 2910 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,782 psi | 87% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,637 psi | 86% | 2966 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 57% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,029 psi | 88% | 2923 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,507 psi | 87% | 2910 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,406 psi | 88% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,579 psi | 87% | 2923 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 58,349 psi | 90% | 3038 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,222 psi | 68% | 2818 fps | 97.4% |
| Lovex S065 | <<locked>> | 84% | 57,261 psi | 88% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,448 psi | 85% | 2900 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,595 psi | 89% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,494 psi | 90% | 2979 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,788 psi | 69% | 2848 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 56,434 psi | 87% | 3012 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,187 psi | 85% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,332 psi | 85% | 2999 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 58,117 psi | 89% | 2976 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,160 psi | 90% | 2989 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,290 psi | 88% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,999 psi | 86% | 2986 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,160 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3051 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 55,303 psi | 85% | 2910 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 57,232 psi | 88% | 2976 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,581 psi | 90% | 2940 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,261 psi | 88% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,448 psi | 85% | 2900 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,478 psi | 87% | 2858 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,797 psi | 87% | 2969 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,014 psi | 88% | 2897 fps | 98.8% |
| Somchem S365 | <<locked>> | 86% | 56,130 psi | 86% | 2920 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,711 psi | 89% | 2943 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,348 psi | 88% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,985 psi | 88% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,522 psi | 89% | 2923 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,173 psi | 86% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,014 psi | 86% | 2940 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,086 psi | 86% | 3012 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 56,579 psi | 87% | 2992 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,044 psi | 89% | 3054 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,853 psi | 84% | 3045 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,782 psi | 87% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,755 psi | 90% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,159 psi | 88% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,856 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% | 36,767 psi | 57% | 2562 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 49,298 psi | 76% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,353 psi | 68% | 2802 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 41,118 psi | 63% | 2703 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 39,320 psi | 61% | 2687 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 90% | 38,276 psi | 59% | 2651 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 88% | 32,242 psi | 50% | 2546 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,524 psi | 64% | 2700 fps | 97.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,282 psi | 73% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,147 psi | 63% | 2694 fps | 97.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,927 psi | 57% | 2631 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,621 psi | 55% | 2595 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,734 psi | 47% | 2503 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,871 psi | 61% | 2740 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,763 psi | 78% | 2841 fps | 95.7% |
| Bofors RP15 | <<locked>> | 82% | 36,869 psi | 57% | 2628 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 37,637 psi | 58% | 2664 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 36,927 psi | 57% | 2631 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 51,459 psi | 79% | 2828 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 36,492 psi | 56% | 2615 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 51,155 psi | 79% | 2877 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 53,403 psi | 82% | 2894 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 42,177 psi | 65% | 2697 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,263 psi | 64% | 2677 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,570 psi | 69% | 2713 fps | 100% |
| Hodgdon Retumbo | 79.7 gr | 84% | 34,476 psi | 53% | 2644 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,517 psi | 79% | 2904 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1713 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,920 psi | 72% | 2759 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,939 psi | 81% | 2854 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 46,746 psi | 72% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,741 psi | 63% | 2641 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 40,698 psi | 63% | 2726 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,334 psi | 59% | 2694 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 50,372 psi | 78% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,718 psi | 75% | 2792 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 31,401 psi | 48% | 2438 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 47,427 psi | 73% | 2802 fps | 98.4% |
| Norma 217 | <<locked>> | 92% | 33,373 psi | 51% | 2595 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 39,044 psi | 60% | 2703 fps | 97.9% |
| Norma URP | <<locked>> | 80% | 48,283 psi | 74% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,652 psi | 58% | 2667 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 47,340 psi | 73% | 2808 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,634 psi | 52% | 2543 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,603 psi | 76% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,037 psi | 74% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 83.3 gr | 82% | 31,401 psi | 48% | 2546 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,713 psi | 64% | 2772 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 42,250 psi | 65% | 2680 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 40,408 psi | 62% | 2680 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 51,459 psi | 79% | 2828 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,372 psi | 78% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,718 psi | 75% | 2792 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,356 psi | 76% | 2749 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,089 psi | 62% | 2674 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 43,178 psi | 66% | 2664 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 45,498 psi | 70% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,930 psi | 63% | 2661 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 53,635 psi | 83% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,705 psi | 76% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,520 psi | 55% | 2530 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 49,182 psi | 76% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,711 psi | 61% | 2671 fps | 99.9% |
| Vihtavuori N560 | 80.8 gr | 82% | 42,090 psi | 65% | 2756 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 39,610 psi | 61% | 2684 fps | 95% |
| Vihtavuori N568 | <<locked>> | 94% | 46,383 psi | 71% | 2858 fps | 96% |
| Vihtavuori N570 | <<locked>> | 98% | 50,792 psi | 78% | 2972 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,356 psi | 76% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,343 psi | 79% | 2881 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,314 psi | 50% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,521 psi | 58% | 2582 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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Reichenberg HDB Universal. Hodgdon Retumbo delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,104 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 2225, Bofors RP30 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 Universal 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.