Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 220gr | Sako Hammerhead bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ADI AR 2218.
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% | 56,333 psi | 87% | 2589 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 47,268 psi | 73% | 2559 fps | 97% |
| Accurate MAGPRO | <<locked>> | 84% | 55,245 psi | 85% | 2690 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 84% | 57,276 psi | 88% | 2667 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 55,869 psi | 86% | 2684 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 54,926 psi | 85% | 2667 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 55,405 psi | 85% | 2782 fps | 99.3% |
| ADI AR 2225 | <<locked>> | 98% | 58,262 psi | 90% | 2740 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 57,406 psi | 88% | 2664 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 56,797 psi | 87% | 2657 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 56,376 psi | 87% | 2680 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 58,465 psi | 90% | 2638 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 55,129 psi | 85% | 2661 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 55,332 psi | 85% | 2671 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 57,261 psi | 88% | 2759 fps | 99.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 57,101 psi | 88% | 2753 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 56,188 psi | 86% | 2648 fps | 99.1% |
| Bofors RP15 | <<locked>> | 88% | 55,796 psi | 86% | 2671 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 54,969 psi | 85% | 2680 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 56,376 psi | 87% | 2680 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 56,318 psi | 87% | 2684 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 58,740 psi | 90% | 2677 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 86% | 57,479 psi | 88% | 2661 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,566 psi | 89% | 2572 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 58,552 psi | 90% | 2799 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,811 psi | 58% | 1690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 58,595 psi | 90% | 2651 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 58,392 psi | 90% | 2726 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 57,305 psi | 88% | 2608 fps | 96.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2726 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 58,189 psi | 90% | 2612 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2743 fps | 100% |
| Norma MRP | <<locked>> | 84% | 56,608 psi | 87% | 2694 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 55,666 psi | 86% | 2690 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 58,363 psi | 90% | 2677 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,827 psi | 60% | 1729 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 55,201 psi | 85% | 2730 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 58,595 psi | 90% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 57,580 psi | 89% | 2638 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 56,652 psi | 87% | 2651 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 49,400 psi | 76% | 2569 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 56,275 psi | 87% | 2648 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 55,259 psi | 85% | 2582 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 57,029 psi | 88% | 2621 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 56,971 psi | 88% | 2608 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 56,231 psi | 87% | 2641 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 84% | 56,492 psi | 87% | 2618 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 55,956 psi | 86% | 2697 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 90% | 57,087 psi | 88% | 2694 fps | 100% |
| Vihtavuori N568 | <<locked>> | 92% | 55,042 psi | 85% | 2707 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 94% | 56,246 psi | 87% | 2766 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 55,216 psi | 85% | 2677 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 56,826 psi | 87% | 2618 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% | 46,006 psi | 71% | 2448 fps | 100% |
| Accurate 8700 | <<locked>> | 96% | 40,944 psi | 63% | 2444 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 48,022 psi | 74% | 2579 fps | 99% |
| ADI AR 2209 | <<locked>> | 80% | 50,082 psi | 77% | 2566 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 45,324 psi | 70% | 2523 fps | 99.2% |
| ADI AR 2217 | <<locked>> | 80% | 33,823 psi | 52% | 2293 fps | 96.7% |
| ADI AR 2218 | 88.6 gr | 90% | 41,292 psi | 64% | 2523 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 31,154 psi | 48% | 2270 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 50,372 psi | 78% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,908 psi | 77% | 2559 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,093 psi | 71% | 2526 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 44,889 psi | 69% | 2457 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,059 psi | 60% | 2418 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,358 psi | 79% | 2618 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 39,392 psi | 61% | 2457 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 92% | 42,366 psi | 65% | 2510 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,265 psi | 67% | 2441 fps | 96.6% |
| Bofors RP15 | <<locked>> | 80% | 42,917 psi | 66% | 2467 fps | 99.5% |
| Bofors RP30 | <<locked>> | 80% | 36,492 psi | 56% | 2365 fps | 97.7% |
| Bofors RP5 | <<locked>> | 80% | 46,093 psi | 71% | 2526 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 80% | 36,898 psi | 57% | 2362 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 80% | 47,834 psi | 74% | 2516 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,949 psi | 72% | 2503 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,954 psi | 83% | 2530 fps | 100% |
| Hodgdon Retumbo | 74.3 gr | 80% | 38,145 psi | 59% | 2467 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 44% | 1512 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,515 psi | 75% | 2503 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 80% | 44,092 psi | 68% | 2507 fps | 99.1% |
| IMR 7977 Enduron | <<locked>> | 90% | 53,780 psi | 83% | 2556 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 82% | 30,792 psi | 47% | 2251 fps | 95.3% |
| Lovex S071 | <<locked>> | 80% | 39,740 psi | 61% | 2339 fps | 100% |
| Norma 217 | <<locked>> | 80% | 28,993 psi | 45% | 2221 fps | 96.8% |
| Norma MRP | <<locked>> | 80% | 49,124 psi | 76% | 2585 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,570 psi | 69% | 2523 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 80% | 40,132 psi | 62% | 2408 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,254 psi | 45% | 1552 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 37,666 psi | 58% | 2448 fps | 99.9% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 34,548 psi | 53% | 2346 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 50,720 psi | 78% | 2539 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 80% | 49,734 psi | 77% | 2552 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 96% | 42,975 psi | 66% | 2461 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,385 psi | 76% | 2549 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 51,648 psi | 79% | 2530 fps | 99.6% |
| Somchem S385 | <<locked>> | 80% | 49,980 psi | 77% | 2523 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,787 psi | 67% | 2418 fps | 99.8% |
| Vihtavuori N170 | <<locked>> | 86% | 45,934 psi | 71% | 2477 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 49,690 psi | 76% | 2526 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,646 psi | 75% | 2589 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 80% | 40,625 psi | 63% | 2428 fps | 98.1% |
| Vihtavuori N568 | <<locked>> | 80% | 35,665 psi | 55% | 2362 fps | 95.2% |
| Vihtavuori N570 | 82.9 gr | 86% | 42,177 psi | 65% | 2530 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,888 psi | 68% | 2523 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,195 psi | 71% | 2467 fps | 99.8% |
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 53 powders for .300 Rem. Ultra Mag. loaded with the .308 | 220gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 2,799 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,799 fps. Accurate 8700 gives the best case fill at 100 %, and 53 of the 53 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 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, Alliant Reloder-50, Hodgdon TrailBoss 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. Vihtavuori N570, Hodgdon Retumbo, ADI AR 2218 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 220gr | Sako Hammerhead 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.