Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | Berger JUG bullet and 69 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 ReloadSwiss RS 80.
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% | 57,029 psi | 88% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,290 psi | 88% | 2822 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,927 psi | 86% | 2897 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 58,421 psi | 90% | 2887 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,666 psi | 87% | 2894 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,056 psi | 85% | 2864 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2894 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,606 psi | 83% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,479 psi | 90% | 2874 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,870 psi | 89% | 2874 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,029 psi | 88% | 2890 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,697 psi | 90% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 54,926 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,390 psi | 85% | 2884 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,956 psi | 88% | 2946 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,551 psi | 89% | 2854 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 56,217 psi | 87% | 2877 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 58,639 psi | 90% | 2930 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,029 psi | 88% | 2890 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,421 psi | 90% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,637 psi | 87% | 2884 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,697 psi | 90% | 2874 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,898 psi | 86% | 2831 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,740 psi | 90% | 2871 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,465 psi | 90% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,682 psi | 89% | 2999 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 58% | 1827 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,116 psi | 88% | 2808 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,638 psi | 89% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,521 psi | 87% | 2815 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 54,766 psi | 84% | 2874 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,863 psi | 75% | 2799 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 57,276 psi | 88% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,666 psi | 86% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,523 psi | 90% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,349 psi | 90% | 2864 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,850 psi | 77% | 2825 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,159 psi | 88% | 2907 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,477 psi | 85% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,985 psi | 86% | 2894 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 58,204 psi | 90% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,740 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,653 psi | 89% | 2841 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,144 psi | 86% | 2867 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,650 psi | 84% | 2933 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,465 psi | 90% | 2956 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 55,274 psi | 85% | 2802 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 57,580 psi | 89% | 2864 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,421 psi | 90% | 2818 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,276 psi | 88% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,666 psi | 86% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,231 psi | 87% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,174 psi | 88% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,942 psi | 88% | 2789 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 56,855 psi | 88% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,015 psi | 89% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,985 psi | 88% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,841 psi | 89% | 2815 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,043 psi | 88% | 2828 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 82% | 56,391 psi | 87% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,826 psi | 87% | 2831 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,666 psi | 87% | 2907 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 57,406 psi | 88% | 2894 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 54,737 psi | 84% | 2894 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 55,941 psi | 86% | 2953 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,594 psi | 87% | 2740 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,508 psi | 90% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,044 psi | 89% | 2831 fps | 100% |
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% | 40,567 psi | 62% | 2539 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 53,621 psi | 83% | 2772 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,974 psi | 65% | 2651 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 44,556 psi | 69% | 2664 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 39,885 psi | 61% | 2598 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 36,448 psi | 56% | 2516 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 47,892 psi | 74% | 2822 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 28,979 psi | 45% | 2362 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,068 psi | 79% | 2772 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,541 psi | 69% | 2657 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,509 psi | 62% | 2608 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,276 psi | 60% | 2562 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,895 psi | 52% | 2490 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,266 psi | 68% | 2713 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,353 psi | 70% | 2749 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,442 psi | 73% | 2687 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 37,724 psi | 58% | 2546 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 36,143 psi | 56% | 2530 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 40,509 psi | 62% | 2608 fps | 97.9% |
| Bofors RP7 | <<locked>> | 80% | 54,882 psi | 84% | 2769 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,606 psi | 53% | 2474 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 54,897 psi | 84% | 2822 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,511 psi | 65% | 2605 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,756 psi | 64% | 2589 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,051 psi | 74% | 2654 fps | 100% |
| Hodgdon Retumbo | 74.8 gr | 80% | 33,098 psi | 51% | 2513 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 43% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,285 psi | 77% | 2707 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,575 psi | 78% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,772 psi | 67% | 2602 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 38,580 psi | 59% | 2579 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,130 psi | 57% | 2572 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 53,853 psi | 83% | 2740 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,301 psi | 80% | 2736 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,824 psi | 54% | 2418 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 50,966 psi | 78% | 2753 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,284 psi | 47% | 2418 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 42,873 psi | 66% | 2677 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,040 psi | 80% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,450 psi | 59% | 2585 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 50,966 psi | 78% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,505 psi | 53% | 2470 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,737 psi | 83% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,156 psi | 80% | 2812 fps | 100% |
| ReloadSwiss RS 76 | 80 gr | 80% | 32,242 psi | 50% | 2484 fps | 96.9% |
| ReloadSwiss RS 80 | 88.7 gr | 88% | 39,639 psi | 61% | 2631 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 45,469 psi | 70% | 2638 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 43,976 psi | 68% | 2644 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 54,882 psi | 84% | 2769 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,853 psi | 83% | 2740 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,301 psi | 80% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,605 psi | 81% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,642 psi | 67% | 2641 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 46,470 psi | 72% | 2625 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 49,661 psi | 76% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,556 psi | 69% | 2625 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 53,476 psi | 82% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,812 psi | 60% | 2503 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 94% | 53,316 psi | 82% | 2772 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,808 psi | 81% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,627 psi | 67% | 2635 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,685 psi | 66% | 2664 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 37,898 psi | 58% | 2549 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 40,930 psi | 63% | 2651 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 94% | 48,283 psi | 74% | 2825 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,808 psi | 81% | 2694 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,666 psi | 56% | 2602 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,959 psi | 63% | 2552 fps | 97.9% |
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 69 powders for .300 Rem. Ultra Mag. loaded with the .308 | 185gr | Berger JUG. Hodgdon Retumbo delivers the highest muzzle velocity at 2,999 fps; across all powders the maximum-charge window runs from 1,827 fps to 2,999 fps. ADI AR 2218 gives the best case fill at 100 %, and 69 of the 69 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 185gr | Berger JUG 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.