Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | NorthFork Bonded Core bullet and 63 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>> | 88% | 55,506 psi | 85% | 2687 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 58,175 psi | 90% | 2841 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 56,652 psi | 87% | 2769 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 54,955 psi | 85% | 2779 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 57,464 psi | 88% | 2808 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,998 psi | 83% | 2858 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 2825 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,782 psi | 87% | 2766 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,753 psi | 87% | 2756 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,159 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,419 psi | 85% | 2776 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,246 psi | 88% | 2740 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 57,537 psi | 89% | 2808 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 58,073 psi | 89% | 2822 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,521 psi | 85% | 2841 fps | 98.3% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 51,053 psi | 79% | 2762 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,840 psi | 86% | 2743 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 58,494 psi | 90% | 2818 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 57,334 psi | 88% | 2822 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 55,419 psi | 85% | 2776 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,143 psi | 85% | 2776 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,943 psi | 89% | 2769 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,869 psi | 88% | 2756 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,985 psi | 88% | 2680 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,478 psi | 87% | 2887 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,623 psi | 58% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,419 psi | 85% | 2694 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,028 psi | 86% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 58,305 psi | 90% | 2749 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 57,130 psi | 88% | 2818 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,343 psi | 79% | 2753 fps | 99.7% |
| Lovex S070 | <<locked>> | 82% | 57,624 psi | 89% | 2720 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,159 psi | 88% | 2707 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,550 psi | 87% | 2749 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 52,344 psi | 81% | 2776 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,434 psi | 85% | 2789 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,624 psi | 89% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 58,508 psi | 90% | 2838 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 56,536 psi | 87% | 2743 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,087 psi | 88% | 2772 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,566 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 58,595 psi | 90% | 2802 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,595 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,869 psi | 88% | 2848 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 57,203 psi | 88% | 2736 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,912 psi | 86% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,624 psi | 89% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,972 psi | 89% | 2674 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,521 psi | 85% | 2746 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,726 psi | 90% | 2730 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 55,347 psi | 85% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 56,376 psi | 87% | 2720 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 56,304 psi | 87% | 2707 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 55,448 psi | 85% | 2723 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 82% | 58,334 psi | 90% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 55,492 psi | 85% | 2720 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 54,926 psi | 85% | 2792 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 55,898 psi | 86% | 2785 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 57,479 psi | 88% | 2848 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 98% | 58,668 psi | 90% | 2907 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,740 psi | 90% | 2674 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 57,334 psi | 88% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 56,231 psi | 87% | 2717 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% | 42,250 psi | 65% | 2487 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 43,729 psi | 67% | 2602 fps | 97.2% |
| ADI AR 2209 | <<locked>> | 80% | 46,209 psi | 71% | 2608 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 41,510 psi | 64% | 2552 fps | 97.6% |
| ADI AR 2217 | <<locked>> | 82% | 33,214 psi | 51% | 2362 fps | 95% |
| ADI AR 2218 | <<locked>> | 96% | 46,557 psi | 72% | 2720 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 80% | 28,355 psi | 44% | 2277 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,586 psi | 72% | 2605 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,113 psi | 82% | 2707 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,151 psi | 71% | 2598 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,221 psi | 65% | 2556 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,959 psi | 63% | 2503 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,375 psi | 54% | 2444 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 46,369 psi | 71% | 2657 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 44,121 psi | 68% | 2648 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 98% | 47,268 psi | 73% | 2697 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,105 psi | 66% | 2523 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 39,276 psi | 60% | 2497 fps | 98% |
| Bofors RP30 | <<locked>> | 80% | 32,938 psi | 51% | 2379 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 42,221 psi | 65% | 2556 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 80% | 33,707 psi | 52% | 2379 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 44,164 psi | 68% | 2552 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,337 psi | 67% | 2536 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,082 psi | 77% | 2589 fps | 100% |
| Hodgdon Retumbo | 73.5 gr | 80% | 34,548 psi | 53% | 2477 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,837 psi | 80% | 2641 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 52,533 psi | 81% | 2648 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,179 psi | 70% | 2543 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 80% | 40,335 psi | 62% | 2536 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,982 psi | 52% | 2421 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 53,925 psi | 83% | 2671 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,477 psi | 56% | 2375 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 52,779 psi | 81% | 2694 fps | 99.9% |
| Norma 217 | <<locked>> | 84% | 29,791 psi | 46% | 2333 fps | 96% |
| Norma MRP | <<locked>> | 80% | 44,817 psi | 69% | 2625 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 53,809 psi | 83% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 40,292 psi | 62% | 2543 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 80% | 52,852 psi | 81% | 2694 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,245 psi | 56% | 2431 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,935 psi | 45% | 1614 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 54,418 psi | 84% | 2749 fps | 100% |
| ReloadSwiss RS 76 | 78.7 gr | 80% | 33,852 psi | 52% | 2454 fps | 98.4% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 38,798 psi | 60% | 2536 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 47,137 psi | 73% | 2582 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 80% | 45,832 psi | 71% | 2592 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 53,925 psi | 83% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,375 psi | 84% | 2625 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 45,498 psi | 70% | 2589 fps | 99.3% |
| Somchem S361 | <<locked>> | 80% | 48,109 psi | 74% | 2569 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 51,561 psi | 79% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,209 psi | 71% | 2566 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 40,321 psi | 62% | 2451 fps | 98.8% |
| Vihtavuori N170 | <<locked>> | 92% | 51,837 psi | 80% | 2667 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 54,607 psi | 84% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,556 psi | 70% | 2575 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,541 psi | 69% | 2618 fps | 98% |
| Vihtavuori N565 | <<locked>> | 80% | 36,956 psi | 57% | 2448 fps | 96% |
| Vihtavuori N568 | <<locked>> | 86% | 40,045 psi | 62% | 2552 fps | 95.7% |
| Vihtavuori N570 | 87.8 gr | 92% | 47,210 psi | 73% | 2723 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,766 psi | 84% | 2628 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,928 psi | 60% | 2556 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,583 psi | 66% | 2503 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 63 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | NorthFork Bonded Core. Vihtavuori N570 delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,907 fps. ADI AR 2218 gives the best case fill at 100 %, and 63 of the 63 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 1:12.0 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 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | NorthFork Bonded Core 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.