Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | Berger Hybrid Target bullet and 70 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>> | 90% | 56,101 psi | 86% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,623 psi | 87% | 2812 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,998 psi | 85% | 2884 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 88% | 57,653 psi | 89% | 2874 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,709 psi | 86% | 2881 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,073 psi | 89% | 2907 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,778 psi | 78% | 2874 fps | 96.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,576 psi | 81% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,580 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,130 psi | 88% | 2861 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,115 psi | 86% | 2877 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,696 psi | 89% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,943 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 54,563 psi | 84% | 2874 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,898 psi | 86% | 2933 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,782 psi | 87% | 2841 fps | 97.9% |
| Bofors RP15 | <<locked>> | 92% | 55,506 psi | 85% | 2867 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 57,711 psi | 89% | 2920 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 56,115 psi | 86% | 2877 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,827 psi | 89% | 2808 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,753 psi | 86% | 2874 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,117 psi | 89% | 2864 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,158 psi | 85% | 2818 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,856 psi | 89% | 2858 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,841 psi | 89% | 2785 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,666 psi | 87% | 2989 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,376 psi | 87% | 2799 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,855 psi | 88% | 2802 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,854 psi | 86% | 2802 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 57,827 psi | 89% | 2920 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,008 psi | 74% | 2785 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 56,695 psi | 87% | 2779 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,639 psi | 90% | 2828 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,740 psi | 89% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,798 psi | 89% | 2854 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,718 psi | 75% | 2808 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,202 psi | 86% | 2894 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,523 psi | 90% | 2841 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,955 psi | 85% | 2881 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 57,638 psi | 89% | 2851 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,783 psi | 89% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 59% | 1864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,840 psi | 87% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,303 psi | 85% | 2858 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,088 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,377 psi | 88% | 2943 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 58,349 psi | 90% | 2844 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 56,797 psi | 87% | 2854 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,827 psi | 89% | 2808 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,695 psi | 87% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,639 psi | 90% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,709 psi | 86% | 2733 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,391 psi | 87% | 2848 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,159 psi | 86% | 2779 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 55,985 psi | 86% | 2795 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,305 psi | 88% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,376 psi | 87% | 2782 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,145 psi | 88% | 2808 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,275 psi | 87% | 2818 fps | 96% |
| Vihtavuori N550 | <<locked>> | 82% | 55,637 psi | 86% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,028 psi | 86% | 2822 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,738 psi | 86% | 2894 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 56,550 psi | 87% | 2881 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 57,899 psi | 89% | 2943 fps | 99.1% |
| Vihtavuori N570 | <<locked>> | 98% | 54,839 psi | 84% | 2936 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,912 psi | 86% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,117 psi | 89% | 2864 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,348 psi | 88% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,188 psi | 88% | 2818 fps | 99.9% |
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% | 40,016 psi | 62% | 2526 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 52,953 psi | 81% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,249 psi | 63% | 2635 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 43,976 psi | 68% | 2651 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 39,378 psi | 61% | 2585 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 35,882 psi | 55% | 2500 fps | 95.2% |
| ADI AR 2218 | <<locked>> | 98% | 47,253 psi | 73% | 2805 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 84% | 30,632 psi | 47% | 2411 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,372 psi | 78% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,976 psi | 68% | 2648 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,958 psi | 61% | 2595 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,653 psi | 59% | 2549 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,388 psi | 51% | 2477 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,439 psi | 67% | 2700 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,921 psi | 74% | 2799 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,978 psi | 72% | 2674 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,173 psi | 57% | 2536 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 35,476 psi | 55% | 2516 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 39,958 psi | 61% | 2595 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 54,288 psi | 84% | 2759 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,026 psi | 52% | 2461 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 54,302 psi | 84% | 2812 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,843 psi | 64% | 2589 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,220 psi | 63% | 2575 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,587 psi | 73% | 2644 fps | 100% |
| Hodgdon Retumbo | 73.9 gr | 80% | 32,590 psi | 50% | 2500 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 43% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,719 psi | 77% | 2697 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 49,966 psi | 77% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,265 psi | 67% | 2589 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,014 psi | 59% | 2566 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,347 psi | 56% | 2552 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 53,258 psi | 82% | 2730 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,706 psi | 80% | 2726 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,418 psi | 53% | 2408 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 50,401 psi | 78% | 2746 fps | 99.4% |
| Norma 217 | <<locked>> | 88% | 31,937 psi | 49% | 2464 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 42,293 psi | 65% | 2664 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 51,401 psi | 79% | 2743 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,768 psi | 58% | 2569 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,415 psi | 78% | 2746 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,866 psi | 52% | 2454 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,718 psi | 44% | 1673 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,084 psi | 82% | 2779 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,532 psi | 79% | 2802 fps | 100% |
| ReloadSwiss RS 76 | 79.1 gr | 80% | 31,821 psi | 49% | 2470 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,015 psi | 60% | 2618 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 44,918 psi | 69% | 2628 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 43,395 psi | 67% | 2635 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 54,288 psi | 84% | 2759 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,258 psi | 82% | 2730 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,706 psi | 80% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,069 psi | 80% | 2680 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,047 psi | 66% | 2628 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 46,006 psi | 71% | 2615 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 48,936 psi | 75% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,005 psi | 68% | 2615 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 52,866 psi | 81% | 2736 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,305 psi | 59% | 2493 fps | 97.7% |
| Vihtavuori N170 | <<locked>> | 94% | 52,562 psi | 81% | 2759 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 52,214 psi | 80% | 2740 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,989 psi | 66% | 2621 fps | 100% |
| Vihtavuori N560 | 76.7 gr | 80% | 42,148 psi | 65% | 2657 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 37,231 psi | 57% | 2533 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 43,279 psi | 67% | 2697 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 94% | 47,384 psi | 73% | 2808 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,301 psi | 80% | 2687 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,491 psi | 84% | 2812 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,969 psi | 55% | 2592 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,292 psi | 62% | 2539 fps | 97.7% |
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 70 powders for .300 Rem. Ultra Mag. loaded with the .308 | 185gr | Berger Hybrid Target. Hodgdon Retumbo delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,821 fps to 2,989 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 185.0 gr projectile in 0.308" calls for a 1:11.0 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 | 185gr | Berger Hybrid Target 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.