Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Nosler AccuBond bullet and 66 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 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>> | 88% | 55,129 psi | 85% | 2680 fps | 100% |
| Accurate High Country | <<locked>> | 86% | 56,913 psi | 88% | 2831 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 58,015 psi | 89% | 2838 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 56,463 psi | 87% | 2766 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 58,639 psi | 90% | 2831 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 57,290 psi | 88% | 2805 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,693 psi | 83% | 2851 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,709 psi | 86% | 2822 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,608 psi | 87% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,521 psi | 87% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,999 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,245 psi | 85% | 2772 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,014 psi | 88% | 2736 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,145 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,899 psi | 89% | 2822 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,172 psi | 85% | 2835 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 50,705 psi | 78% | 2759 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,521 psi | 85% | 2740 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 58,117 psi | 89% | 2812 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,942 psi | 88% | 2818 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,245 psi | 85% | 2772 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 54,781 psi | 84% | 2772 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,754 psi | 89% | 2769 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,739 psi | 87% | 2753 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,768 psi | 87% | 2677 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,043 psi | 86% | 2884 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 58% | 1759 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,042 psi | 85% | 2687 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,825 psi | 86% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 58,175 psi | 90% | 2749 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,927 psi | 88% | 2815 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,169 psi | 79% | 2749 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 58,769 psi | 90% | 2713 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 57,217 psi | 88% | 2717 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,768 psi | 87% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,333 psi | 87% | 2746 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,156 psi | 80% | 2772 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,245 psi | 85% | 2785 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,203 psi | 88% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,305 psi | 90% | 2835 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 56,333 psi | 87% | 2743 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,724 psi | 87% | 2769 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,189 psi | 90% | 2799 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,203 psi | 88% | 2874 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,550 psi | 87% | 2841 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 57,029 psi | 88% | 2736 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,709 psi | 86% | 2746 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,769 psi | 90% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,217 psi | 88% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,740 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,317 psi | 85% | 2743 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,595 psi | 90% | 2726 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 54,897 psi | 84% | 2684 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,014 psi | 86% | 2717 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,941 psi | 86% | 2703 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,114 psi | 85% | 2720 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 58,131 psi | 89% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,784 psi | 90% | 2759 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,682 psi | 90% | 2844 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 55,550 psi | 85% | 2779 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 57,087 psi | 88% | 2844 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 58,276 psi | 90% | 2904 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,349 psi | 90% | 2671 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,840 psi | 87% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,840 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% | 42,018 psi | 65% | 2484 fps | 99.9% |
| Accurate High Country | <<locked>> | 80% | 46,093 psi | 71% | 2657 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 80% | 43,540 psi | 67% | 2602 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 46,021 psi | 71% | 2602 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 41,307 psi | 64% | 2546 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 84% | 35,259 psi | 54% | 2415 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 46,325 psi | 71% | 2713 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 28,195 psi | 43% | 2270 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,398 psi | 71% | 2602 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,866 psi | 81% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,963 psi | 71% | 2595 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,032 psi | 65% | 2556 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,756 psi | 63% | 2500 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,201 psi | 54% | 2441 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,151 psi | 71% | 2657 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,976 psi | 68% | 2648 fps | 95.4% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,949 psi | 72% | 2694 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 42,960 psi | 66% | 2520 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 39,088 psi | 60% | 2493 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 32,735 psi | 50% | 2375 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 42,032 psi | 65% | 2556 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 33,446 psi | 51% | 2372 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 43,947 psi | 68% | 2549 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,163 psi | 66% | 2533 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,864 psi | 77% | 2585 fps | 100% |
| Hodgdon Retumbo | 73.2 gr | 80% | 34,374 psi | 53% | 2474 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,648 psi | 79% | 2638 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,330 psi | 81% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,005 psi | 69% | 2539 fps | 98% |
| IMR 7828 SSC | <<locked>> | 80% | 40,001 psi | 62% | 2530 fps | 97.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,852 psi | 52% | 2418 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 55,201 psi | 85% | 2667 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,722 psi | 83% | 2667 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,274 psi | 56% | 2372 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 52,591 psi | 81% | 2690 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,617 psi | 46% | 2329 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 44,628 psi | 69% | 2621 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,606 psi | 83% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,089 psi | 62% | 2543 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 80% | 52,663 psi | 81% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,042 psi | 55% | 2428 fps | 98.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1614 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,201 psi | 83% | 2746 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,721 psi | 52% | 2451 fps | 98.4% |
| ReloadSwiss RS 80 | 84.9 gr | 86% | 38,493 psi | 59% | 2530 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 46,949 psi | 72% | 2579 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,643 psi | 70% | 2589 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,201 psi | 85% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,722 psi | 83% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,186 psi | 83% | 2625 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,295 psi | 70% | 2585 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 47,964 psi | 74% | 2569 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 51,329 psi | 79% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,035 psi | 71% | 2562 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 40,147 psi | 62% | 2451 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 51,503 psi | 79% | 2664 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 54,418 psi | 84% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,339 psi | 70% | 2572 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,367 psi | 68% | 2615 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 80% | 36,796 psi | 57% | 2444 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 86% | 39,711 psi | 61% | 2546 fps | 95.6% |
| Vihtavuori N570 | 87.4 gr | 92% | 46,876 psi | 72% | 2717 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,592 psi | 84% | 2625 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,667 psi | 60% | 2552 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,409 psi | 65% | 2500 fps | 98.8% |
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 66 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Nosler AccuBond. Vihtavuori N570 delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,904 fps. ADI AR 2218 gives the best case fill at 100 %, and 66 of the 66 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. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Nosler AccuBond 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.