Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 220gr | Nosler Custom Competition bullet and 56 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 Alliant Reloder-33.
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>> | 86% | 55,056 psi | 85% | 2572 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 45,890 psi | 71% | 2533 fps | 96.5% |
| Accurate High Country | <<locked>> | 84% | 56,942 psi | 88% | 2720 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 57,885 psi | 89% | 2726 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 84% | 56,159 psi | 86% | 2651 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 58,392 psi | 90% | 2717 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 57,406 psi | 88% | 2700 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,812 psi | 89% | 2818 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 98% | 56,347 psi | 87% | 2717 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 56,347 psi | 87% | 2648 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 55,767 psi | 86% | 2641 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 55,114 psi | 85% | 2661 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,116 psi | 88% | 2621 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,348 psi | 88% | 2687 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,957 psi | 89% | 2707 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 55,564 psi | 86% | 2736 fps | 99% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,259 psi | 85% | 2726 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,697 psi | 90% | 2680 fps | 99.3% |
| Bofors RP15 | <<locked>> | 90% | 58,189 psi | 90% | 2700 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,246 psi | 88% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 55,114 psi | 85% | 2661 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 54,853 psi | 84% | 2664 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,290 psi | 88% | 2654 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,260 psi | 87% | 2641 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 56,333 psi | 87% | 2556 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,855 psi | 88% | 2776 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 58% | 1686 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,233 psi | 90% | 2621 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,464 psi | 88% | 2631 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 88% | 56,855 psi | 88% | 2703 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 56,159 psi | 86% | 2585 fps | 96.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,405 psi | 85% | 2703 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 56,927 psi | 88% | 2595 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,753 psi | 87% | 2723 fps | 100% |
| Norma MRP | <<locked>> | 84% | 55,259 psi | 85% | 2677 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,276 psi | 90% | 2723 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 56,724 psi | 87% | 2657 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,885 psi | 60% | 1726 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,609 psi | 89% | 2762 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,855 psi | 88% | 2740 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 84% | 56,536 psi | 87% | 2621 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 55,521 psi | 85% | 2635 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 47,935 psi | 74% | 2546 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 55,143 psi | 85% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,899 psi | 89% | 2615 fps | 99.9% |
| Somchem S365 | <<locked>> | 82% | 58,740 psi | 90% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 55,825 psi | 86% | 2605 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 55,811 psi | 86% | 2592 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 58,740 psi | 90% | 2671 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 84% | 55,259 psi | 85% | 2602 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,610 psi | 90% | 2733 fps | 100% |
| Vihtavuori N565 | <<locked>> | 90% | 55,695 psi | 86% | 2674 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 57,421 psi | 88% | 2743 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 96% | 58,740 psi | 90% | 2802 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,609 psi | 89% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 55,448 psi | 85% | 2602 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% | 44,933 psi | 69% | 2428 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 42,641 psi | 66% | 2477 fps | 95.4% |
| Accurate High Country | <<locked>> | 80% | 49,487 psi | 76% | 2608 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 80% | 46,818 psi | 72% | 2556 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 80% | 49,139 psi | 76% | 2549 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 44,237 psi | 68% | 2503 fps | 99% |
| ADI AR 2217 | <<locked>> | 80% | 33,083 psi | 51% | 2274 fps | 96.3% |
| ADI AR 2218 | <<locked>> | 92% | 43,076 psi | 66% | 2562 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 30,342 psi | 47% | 2251 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,269 psi | 76% | 2546 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,805 psi | 75% | 2539 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,005 psi | 69% | 2507 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,859 psi | 68% | 2441 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,116 psi | 59% | 2402 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,951 psi | 77% | 2602 fps | 100% |
| Alliant Reloder-33 | 86.3 gr | 88% | 41,089 psi | 63% | 2493 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,121 psi | 68% | 2543 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,569 psi | 66% | 2425 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 42,003 psi | 65% | 2451 fps | 99.3% |
| Bofors RP30 | <<locked>> | 80% | 35,462 psi | 55% | 2343 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 45,005 psi | 69% | 2507 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 35,984 psi | 55% | 2343 fps | 98% |
| Hodgdon H4831 | <<locked>> | 80% | 46,775 psi | 72% | 2500 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,934 psi | 71% | 2484 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,895 psi | 81% | 2516 fps | 100% |
| Hodgdon Retumbo | 72.7 gr | 80% | 37,086 psi | 57% | 2444 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 44% | 1509 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,650 psi | 84% | 2575 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,703 psi | 73% | 2487 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 80% | 43,149 psi | 66% | 2490 fps | 98.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 52,634 psi | 81% | 2536 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 84% | 32,039 psi | 49% | 2283 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 38,812 psi | 60% | 2323 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 28,050 psi | 43% | 2198 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 47,979 psi | 74% | 2569 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,395 psi | 67% | 2503 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 80% | 39,117 psi | 60% | 2392 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 45% | 1542 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,564 psi | 56% | 2425 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 36,056 psi | 55% | 2382 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 49,661 psi | 76% | 2523 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 48,602 psi | 75% | 2533 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 44,831 psi | 69% | 2497 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,254 psi | 74% | 2530 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 50,778 psi | 78% | 2513 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 54,955 psi | 85% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,921 psi | 75% | 2507 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 42,786 psi | 66% | 2398 fps | 99.7% |
| Vihtavuori N170 | <<locked>> | 86% | 44,976 psi | 69% | 2457 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 48,472 psi | 75% | 2510 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,572 psi | 73% | 2569 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 80% | 39,639 psi | 61% | 2408 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 82% | 37,362 psi | 57% | 2398 fps | 95.8% |
| Vihtavuori N570 | 81.2 gr | 86% | 41,031 psi | 63% | 2507 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,540 psi | 65% | 2503 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,208 psi | 70% | 2451 fps | 99.7% |
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 56 powders for .300 Rem. Ultra Mag. loaded with the .308 | 220gr | Nosler Custom Competition. ADI AR 2218 delivers the highest muzzle velocity at 2,818 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,818 fps. Accurate 8700 gives the best case fill at 100 %, and 56 of the 56 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 220.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, 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, Alliant Reloder-33 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 220gr | Nosler Custom Competition 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.