Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 240gr | Woodleigh PP SN bullet and 54 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Hodgdon Retumbo.
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>> | 84% | 55,216 psi | 85% | 2474 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 50,314 psi | 77% | 2516 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 84% | 55,143 psi | 85% | 2585 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 82% | 56,086 psi | 86% | 2549 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 58,784 psi | 90% | 2621 fps | 100% |
| ADI AR 2217 | <<locked>> | 94% | 58,146 psi | 89% | 2608 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 58,726 psi | 90% | 2736 fps | 99.9% |
| ADI AR 2225 | <<locked>> | 96% | 57,595 psi | 89% | 2628 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 55,724 psi | 86% | 2543 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 55,579 psi | 86% | 2566 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 86% | 57,435 psi | 88% | 2520 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 58,204 psi | 90% | 2592 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 58,450 psi | 90% | 2602 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 56,623 psi | 87% | 2654 fps | 99.6% |
| Alliant Reloder-50 | <<locked>> | 98% | 56,521 psi | 87% | 2651 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 58,682 psi | 90% | 2589 fps | 99.7% |
| Bofors RP15 | <<locked>> | 88% | 58,639 psi | 90% | 2605 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 58,073 psi | 89% | 2618 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 55,579 psi | 86% | 2566 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 55,593 psi | 86% | 2572 fps | 100% |
| Hodgdon H4831 | <<locked>> | 84% | 57,421 psi | 88% | 2559 fps | 100% |
| Hodgdon H4831 SC | <<locked>> | 84% | 56,420 psi | 87% | 2546 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 57,928 psi | 89% | 2680 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,101 psi | 59% | 1624 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 57,363 psi | 88% | 2536 fps | 100% |
| IMR 7828 SSC | <<locked>> | 86% | 57,421 psi | 88% | 2608 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 90% | 56,014 psi | 86% | 2500 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 56,478 psi | 87% | 2615 fps | 100% |
| Lovex D100 | <<locked>> | 94% | 56,913 psi | 88% | 2546 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 57,246 psi | 88% | 2500 fps | 100% |
| Norma 217 | <<locked>> | 98% | 58,059 psi | 89% | 2631 fps | 100% |
| Norma MRP | <<locked>> | 82% | 55,695 psi | 86% | 2575 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 54,853 psi | 84% | 2575 fps | 100% |
| Ramshot LRT | <<locked>> | 98% | 58,146 psi | 89% | 2667 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 88% | 57,261 psi | 88% | 2562 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,160 psi | 60% | 1660 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 54,665 psi | 84% | 2618 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 57,856 psi | 89% | 2651 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 56,463 psi | 87% | 2523 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 55,550 psi | 85% | 2533 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 94% | 56,913 psi | 88% | 2546 fps | 96.4% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 52,446 psi | 81% | 2526 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 55,172 psi | 85% | 2530 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 57,711 psi | 89% | 2516 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 55,825 psi | 86% | 2507 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 55,840 psi | 86% | 2497 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 55,114 psi | 85% | 2533 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 82% | 55,535 psi | 85% | 2500 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 55,056 psi | 85% | 2585 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 56,202 psi | 86% | 2582 fps | 100% |
| Vihtavuori N568 | <<locked>> | 92% | 58,218 psi | 90% | 2651 fps | 100% |
| Vihtavuori N570 | <<locked>> | 92% | 55,608 psi | 86% | 2661 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 58,711 psi | 90% | 2608 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 55,637 psi | 86% | 2507 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% | 48,428 psi | 75% | 2385 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 40,408 psi | 62% | 2352 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 80% | 48,080 psi | 74% | 2480 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 80% | 52,533 psi | 81% | 2503 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 47,819 psi | 74% | 2467 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 80% | 35,766 psi | 55% | 2254 fps | 98.3% |
| ADI AR 2218 | 83.4 gr | 86% | 37,898 psi | 58% | 2369 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 33,098 psi | 51% | 2234 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 80% | 52,272 psi | 80% | 2493 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 48,573 psi | 75% | 2467 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 47,311 psi | 73% | 2392 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 41,524 psi | 64% | 2362 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 54,215 psi | 83% | 2552 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 84% | 39,015 psi | 60% | 2365 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 88% | 39,175 psi | 60% | 2362 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 45,281 psi | 70% | 2388 fps | 97.9% |
| Bofors RP15 | <<locked>> | 80% | 45,252 psi | 70% | 2415 fps | 99.9% |
| Bofors RP30 | <<locked>> | 80% | 38,783 psi | 60% | 2323 fps | 99% |
| Bofors RP5 | <<locked>> | 80% | 48,573 psi | 75% | 2467 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 38,928 psi | 60% | 2316 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 80% | 50,212 psi | 77% | 2461 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 49,298 psi | 76% | 2444 fps | 99.7% |
| Hodgdon Retumbo | 73.2 gr | 80% | 40,654 psi | 63% | 2425 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,558 psi | 44% | 1450 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 50,604 psi | 78% | 2441 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 80% | 46,644 psi | 72% | 2454 fps | 99.8% |
| IMR 7977 Enduron | <<locked>> | 86% | 49,298 psi | 76% | 2398 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 80% | 30,705 psi | 47% | 2165 fps | 96.3% |
| Lovex D100 | <<locked>> | 92% | 53,098 psi | 82% | 2493 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 41,756 psi | 64% | 2283 fps | 100% |
| Norma 217 | <<locked>> | 80% | 31,125 psi | 48% | 2188 fps | 98.5% |
| Norma MRP | <<locked>> | 80% | 51,982 psi | 80% | 2526 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 47,297 psi | 73% | 2470 fps | 99.9% |
| Ramshot LRT | <<locked>> | 96% | 54,230 psi | 83% | 2612 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 80% | 42,598 psi | 66% | 2359 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,414 psi | 45% | 1486 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 40,059 psi | 62% | 2402 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 36,999 psi | 57% | 2313 fps | 97.3% |
| Rottweil R 904 | <<locked>> | 80% | 52,953 psi | 81% | 2477 fps | 100% |
| Rottweil R 905 | <<locked>> | 80% | 52,025 psi | 80% | 2487 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 92% | 53,098 psi | 82% | 2493 fps | 95.6% |
| SNPE Vectan SP 13 | <<locked>> | 92% | 39,798 psi | 61% | 2320 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 51,677 psi | 80% | 2484 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 53,911 psi | 83% | 2467 fps | 99.9% |
| Somchem S385 | <<locked>> | 80% | 52,373 psi | 81% | 2461 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 46,006 psi | 71% | 2359 fps | 100% |
| Vihtavuori N170 | <<locked>> | 82% | 42,308 psi | 65% | 2326 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 52,257 psi | 80% | 2461 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 51,387 psi | 79% | 2533 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 80% | 43,033 psi | 66% | 2382 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 80% | 38,116 psi | 59% | 2326 fps | 97.2% |
| Vihtavuori N570 | 77.9 gr | 82% | 38,986 psi | 60% | 2375 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 47,152 psi | 73% | 2464 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 48,588 psi | 75% | 2411 fps | 100% |
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 54 powders for .300 Rem. Ultra Mag. loaded with the .308 | 240gr | Woodleigh PP SN. ADI AR 2218 delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,736 fps. Accurate 8700 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 240.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, Hodgdon TrailBoss, ReloadSwiss RS 14 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. ADI AR 2218, Vihtavuori N570, Hodgdon Retumbo rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 240gr | Woodleigh PP SN 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.