Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets bullet and 68 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 80 and Vihtavuori N570.
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>> | 90% | 57,653 psi | 89% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,059 psi | 89% | 2740 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,768 psi | 87% | 2825 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 55,506 psi | 85% | 2756 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 57,798 psi | 89% | 2825 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,130 psi | 86% | 2792 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,678 psi | 81% | 2835 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,650 psi | 84% | 2812 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,608 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,579 psi | 86% | 2743 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,711 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,015 psi | 89% | 2815 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,854 psi | 86% | 2726 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,130 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,492 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,160 psi | 90% | 2881 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,023 psi | 75% | 2733 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,523 psi | 90% | 2782 fps | 98.7% |
| Bofors RP15 | <<locked>> | 92% | 57,174 psi | 88% | 2802 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,622 psi | 86% | 2802 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 58,015 psi | 89% | 2815 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,827 psi | 89% | 2815 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,768 psi | 87% | 2756 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,724 psi | 86% | 2743 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,709 psi | 86% | 2667 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,042 psi | 85% | 2871 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 58% | 1759 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,914 psi | 89% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,363 psi | 90% | 2730 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,261 psi | 88% | 2740 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 55,869 psi | 86% | 2802 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,806 psi | 77% | 2730 fps | 99.5% |
| Lovex S065 | <<locked>> | 82% | 57,754 psi | 89% | 2703 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,376 psi | 87% | 2707 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,506 psi | 85% | 2690 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,376 psi | 85% | 2733 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 50,676 psi | 78% | 2753 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,015 psi | 89% | 2828 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,362 psi | 87% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,101 psi | 88% | 2822 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,303 psi | 85% | 2730 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,651 psi | 86% | 2756 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,450 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,320 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,101 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,057 psi | 86% | 2861 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,274 psi | 85% | 2825 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 56,101 psi | 86% | 2726 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 58,407 psi | 90% | 2785 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,754 psi | 89% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,376 psi | 87% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,768 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,001 psi | 89% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,580 psi | 89% | 2717 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 57,696 psi | 89% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,711 psi | 90% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,928 psi | 89% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,784 psi | 90% | 2740 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,914 psi | 89% | 2762 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 82% | 57,058 psi | 88% | 2717 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,667 psi | 89% | 2749 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,522 psi | 89% | 2835 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 58,305 psi | 90% | 2822 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 55,767 psi | 86% | 2828 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 57,130 psi | 88% | 2887 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,580 psi | 89% | 2664 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,405 psi | 85% | 2805 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,798 psi | 90% | 2753 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% | 40,654 psi | 63% | 2461 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 54,041 psi | 83% | 2687 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,366 psi | 65% | 2582 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 45,078 psi | 69% | 2589 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,350 psi | 62% | 2533 fps | 97.3% |
| ADI AR 2217 | <<locked>> | 84% | 34,389 psi | 53% | 2395 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 45,281 psi | 70% | 2697 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 27,166 psi | 42% | 2244 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,426 psi | 70% | 2589 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,924 psi | 80% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,005 psi | 69% | 2582 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,944 psi | 63% | 2536 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,769 psi | 61% | 2487 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,142 psi | 53% | 2418 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,831 psi | 69% | 2638 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,137 psi | 71% | 2690 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 98% | 45,469 psi | 70% | 2667 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,092 psi | 69% | 2566 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,014 psi | 59% | 2474 fps | 97.7% |
| Bofors RP30 | <<locked>> | 82% | 34,040 psi | 52% | 2408 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,944 psi | 63% | 2536 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 80% | 32,547 psi | 50% | 2352 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 80% | 43,004 psi | 66% | 2533 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,192 psi | 65% | 2516 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,834 psi | 75% | 2575 fps | 100% |
| Hodgdon Retumbo | 73.4 gr | 80% | 33,315 psi | 51% | 2451 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,778 psi | 78% | 2628 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,213 psi | 79% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,150 psi | 68% | 2530 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 80% | 39,146 psi | 60% | 2516 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,027 psi | 54% | 2448 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 54,404 psi | 84% | 2657 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,678 psi | 81% | 2657 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,954 psi | 54% | 2349 fps | 98.9% |
| Norma 204 | <<locked>> | 80% | 51,648 psi | 79% | 2677 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 28,369 psi | 44% | 2297 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 43,468 psi | 67% | 2602 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 52,562 psi | 81% | 2671 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,001 psi | 60% | 2523 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 51,648 psi | 79% | 2677 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,882 psi | 54% | 2405 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 44% | 1614 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,404 psi | 84% | 2707 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,142 psi | 82% | 2733 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,532 psi | 50% | 2425 fps | 97.9% |
| ReloadSwiss RS 80 | 85.2 gr | 86% | 37,275 psi | 57% | 2507 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 46,035 psi | 71% | 2566 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,556 psi | 69% | 2575 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,404 psi | 84% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,678 psi | 81% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,214 psi | 82% | 2615 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,222 psi | 68% | 2569 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 46,963 psi | 72% | 2556 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 50,183 psi | 77% | 2628 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,889 psi | 69% | 2549 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 54,056 psi | 83% | 2661 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,102 psi | 60% | 2434 fps | 98.5% |
| Vihtavuori N170 | <<locked>> | 92% | 50,270 psi | 77% | 2644 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 53,330 psi | 82% | 2667 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,048 psi | 68% | 2556 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,294 psi | 67% | 2598 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 35,520 psi | 55% | 2418 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 86% | 38,638 psi | 59% | 2526 fps | 95.2% |
| Vihtavuori N570 | 87.6 gr | 92% | 45,556 psi | 70% | 2694 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,621 psi | 83% | 2615 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,362 psi | 57% | 2530 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,350 psi | 64% | 2487 fps | 98.6% |
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 68 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets. Vihtavuori N570 delivers the highest muzzle velocity at 2,887 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,887 fps. ADI AR 2218 gives the best case fill at 100 %, and 68 of the 68 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-33 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, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | MAKER 200 Grain .308 Expanding Subsonic Blackout Bullets 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.