Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Berger Hybrid Target bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and ReloadSwiss RS 76.
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% | 58,740 psi | 90% | 2726 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,667 psi | 89% | 2835 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 56,086 psi | 86% | 2759 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 58,479 psi | 90% | 2831 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,724 psi | 87% | 2799 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2844 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,347 psi | 87% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,666 psi | 86% | 2749 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 54,897 psi | 84% | 2769 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,666 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,768 psi | 87% | 2799 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,493 psi | 88% | 2815 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,694 psi | 84% | 2828 fps | 98.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,241 psi | 77% | 2753 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,245 psi | 85% | 2733 fps | 98.2% |
| Bofors RP15 | <<locked>> | 92% | 57,986 psi | 89% | 2812 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,594 psi | 87% | 2815 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 54,897 psi | 84% | 2769 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 58,610 psi | 90% | 2825 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,435 psi | 88% | 2762 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,376 psi | 87% | 2749 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,347 psi | 87% | 2674 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,883 psi | 86% | 2881 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 58% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,450 psi | 90% | 2736 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,448 psi | 85% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,827 psi | 89% | 2743 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,594 psi | 87% | 2812 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,850 psi | 78% | 2746 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 58,639 psi | 90% | 2710 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 57,072 psi | 88% | 2713 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,623 psi | 87% | 2700 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,985 psi | 86% | 2740 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,590 psi | 79% | 2766 fps | 100% |
| Norma MRP | <<locked>> | 86% | 54,882 psi | 84% | 2785 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,043 psi | 88% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,914 psi | 89% | 2831 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,956 psi | 86% | 2736 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,376 psi | 87% | 2762 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 59% | 1798 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,001 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,840 psi | 87% | 2871 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,202 psi | 86% | 2838 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 56,681 psi | 87% | 2730 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,332 psi | 85% | 2740 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,639 psi | 90% | 2710 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,072 psi | 88% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,624 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,740 psi | 90% | 2789 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,276 psi | 90% | 2723 fps | 99.7% |
| Somchem S365 | <<locked>> | 84% | 58,508 psi | 90% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,869 psi | 86% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,566 psi | 90% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,796 psi | 86% | 2700 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,740 psi | 90% | 2772 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 82% | 57,754 psi | 89% | 2723 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,610 psi | 90% | 2759 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,305 psi | 90% | 2841 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,201 psi | 85% | 2776 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 56,782 psi | 87% | 2841 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 98% | 57,928 psi | 89% | 2897 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,247 psi | 90% | 2667 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,391 psi | 87% | 2815 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,753 psi | 86% | 2710 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% | 41,858 psi | 64% | 2480 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 43,381 psi | 67% | 2598 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 45,847 psi | 71% | 2602 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 41,176 psi | 63% | 2546 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 35,143 psi | 54% | 2411 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 46,050 psi | 71% | 2710 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 80% | 28,079 psi | 43% | 2267 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,678 psi | 81% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,788 psi | 70% | 2595 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,872 psi | 64% | 2552 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,553 psi | 62% | 2497 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,041 psi | 54% | 2438 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,774 psi | 70% | 2651 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,511 psi | 67% | 2638 fps | 95.2% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,659 psi | 72% | 2687 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,888 psi | 66% | 2520 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,928 psi | 60% | 2493 fps | 97.9% |
| Bofors RP30 | <<locked>> | 80% | 32,561 psi | 50% | 2372 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 41,872 psi | 64% | 2552 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 33,301 psi | 51% | 2369 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,816 psi | 67% | 2546 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,989 psi | 66% | 2530 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,487 psi | 76% | 2582 fps | 100% |
| Hodgdon Retumbo | 72.9 gr | 80% | 34,243 psi | 53% | 2470 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,517 psi | 79% | 2638 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,953 psi | 80% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,860 psi | 69% | 2536 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,842 psi | 61% | 2526 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,562 psi | 52% | 2411 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 55,042 psi | 85% | 2664 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,577 psi | 82% | 2664 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,129 psi | 56% | 2369 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 52,446 psi | 81% | 2687 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,486 psi | 45% | 2326 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 44,469 psi | 68% | 2618 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,417 psi | 82% | 2680 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,769 psi | 61% | 2536 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 52,504 psi | 81% | 2687 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,766 psi | 55% | 2421 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1611 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,824 psi | 83% | 2743 fps | 100% |
| ReloadSwiss RS 76 | 78 gr | 80% | 33,446 psi | 51% | 2444 fps | 98.3% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 38,189 psi | 59% | 2523 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 46,804 psi | 72% | 2579 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 45,469 psi | 70% | 2585 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,042 psi | 85% | 2664 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,577 psi | 82% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,099 psi | 83% | 2621 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,136 psi | 69% | 2582 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 47,688 psi | 73% | 2562 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 51,155 psi | 79% | 2635 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,861 psi | 71% | 2562 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 54,853 psi | 84% | 2671 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 40,001 psi | 62% | 2448 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 51,227 psi | 79% | 2657 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 54,259 psi | 84% | 2674 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,150 psi | 69% | 2569 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,222 psi | 68% | 2612 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 36,622 psi | 56% | 2441 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 86% | 39,581 psi | 61% | 2543 fps | 95.5% |
| Vihtavuori N570 | 87 gr | 92% | 46,557 psi | 72% | 2713 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,244 psi | 83% | 2621 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,479 psi | 59% | 2549 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,250 psi | 65% | 2497 fps | 98.7% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Berger Hybrid Target. Vihtavuori N570 delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,897 fps. Accurate 8700 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 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Berger Hybrid Target they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT 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.