Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Barnes TSX FB bullet and 70 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 76 and ReloadSwiss RS 80.
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% | 56,536 psi | 87% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,971 psi | 88% | 2723 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 55,506 psi | 85% | 2802 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 88% | 58,189 psi | 90% | 2792 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,449 psi | 87% | 2802 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 54,926 psi | 85% | 2776 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,358 psi | 79% | 2808 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,349 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,812 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,695 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,537 psi | 90% | 2759 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,740 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,259 psi | 85% | 2792 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,608 psi | 87% | 2858 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,319 psi | 88% | 2766 fps | 98.5% |
| Bofors RP15 | <<locked>> | 92% | 56,072 psi | 86% | 2785 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 58,247 psi | 90% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 56,695 psi | 87% | 2795 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,233 psi | 90% | 2726 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,565 psi | 87% | 2795 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,581 psi | 90% | 2779 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,724 psi | 86% | 2740 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,537 psi | 90% | 2779 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,508 psi | 90% | 2700 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,624 psi | 89% | 2907 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1752 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,014 psi | 88% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,363 psi | 88% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,289 psi | 87% | 2723 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 92% | 58,697 psi | 90% | 2841 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,588 psi | 75% | 2710 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 57,000 psi | 88% | 2690 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,405 psi | 85% | 2694 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,030 psi | 89% | 2723 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,233 psi | 90% | 2772 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 49,400 psi | 76% | 2736 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,869 psi | 88% | 2812 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,347 psi | 85% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 55,898 psi | 86% | 2805 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 58,044 psi | 89% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,494 psi | 90% | 2792 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,290 psi | 59% | 1791 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,348 psi | 88% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,101 psi | 86% | 2772 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 54,520 psi | 84% | 2841 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,146 psi | 89% | 2867 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 55,201 psi | 85% | 2710 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,450 psi | 88% | 2772 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,233 psi | 90% | 2726 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,000 psi | 88% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,405 psi | 85% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,883 psi | 86% | 2648 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,043 psi | 88% | 2766 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 56,637 psi | 87% | 2700 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 56,608 psi | 87% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,638 psi | 89% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,913 psi | 88% | 2697 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,740 psi | 89% | 2726 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,681 psi | 87% | 2743 fps | 96.8% |
| Vihtavuori N550 | <<locked>> | 82% | 56,144 psi | 86% | 2703 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 56,405 psi | 87% | 2733 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,405 psi | 87% | 2815 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,840 psi | 87% | 2799 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 98% | 58,494 psi | 90% | 2867 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 98% | 55,666 psi | 86% | 2867 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,536 psi | 87% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,798 psi | 90% | 2782 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,465 psi | 90% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,769 psi | 89% | 2740 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% | 39,929 psi | 61% | 2448 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 53,142 psi | 82% | 2674 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,495 psi | 64% | 2562 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 44,324 psi | 68% | 2575 fps | 99% |
| ADI AR 2213 | <<locked>> | 80% | 39,653 psi | 61% | 2516 fps | 97% |
| ADI AR 2217 | <<locked>> | 84% | 33,678 psi | 52% | 2379 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 96% | 44,251 psi | 68% | 2671 fps | 95% |
| ADI AR 2225 | <<locked>> | 82% | 28,529 psi | 44% | 2283 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,024 psi | 79% | 2680 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,280 psi | 68% | 2569 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,190 psi | 62% | 2520 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,812 psi | 60% | 2467 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,460 psi | 51% | 2405 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,816 psi | 67% | 2621 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,875 psi | 69% | 2664 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,367 psi | 68% | 2549 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 37,289 psi | 57% | 2457 fps | 97.4% |
| Bofors RP30 | <<locked>> | 82% | 33,228 psi | 51% | 2388 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 40,190 psi | 62% | 2520 fps | 98.3% |
| Bofors RP7 | <<locked>> | 80% | 54,723 psi | 84% | 2674 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,171 psi | 53% | 2392 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 54,853 psi | 84% | 2726 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,148 psi | 65% | 2516 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,495 psi | 64% | 2503 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,993 psi | 74% | 2562 fps | 100% |
| Hodgdon Retumbo | 72.2 gr | 80% | 32,648 psi | 50% | 2431 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,036 psi | 43% | 1568 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,038 psi | 77% | 2618 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 50,183 psi | 77% | 2618 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,497 psi | 67% | 2513 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,261 psi | 59% | 2493 fps | 96.6% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,084 psi | 52% | 2428 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 53,447 psi | 82% | 2644 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,895 psi | 80% | 2644 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,214 psi | 53% | 2333 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 50,720 psi | 78% | 2664 fps | 99.7% |
| Norma 217 | <<locked>> | 86% | 29,747 psi | 46% | 2336 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 42,540 psi | 65% | 2585 fps | 99.6% |
| Norma URP | <<locked>> | 80% | 51,735 psi | 80% | 2657 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,101 psi | 59% | 2503 fps | 97% |
| Ramshot Hunter | <<locked>> | 80% | 50,705 psi | 78% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,084 psi | 52% | 2385 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 44% | 1608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,417 psi | 82% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,112 psi | 80% | 2720 fps | 100% |
| ReloadSwiss RS 76 | 77.3 gr | 80% | 31,836 psi | 49% | 2405 fps | 97.5% |
| ReloadSwiss RS 80 | 85.7 gr | 88% | 39,291 psi | 60% | 2549 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,324 psi | 70% | 2552 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 80% | 43,627 psi | 67% | 2556 fps | 99% |
| Rottweil R 907 | <<locked>> | 80% | 54,723 psi | 84% | 2674 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,447 psi | 82% | 2644 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,895 psi | 80% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,301 psi | 80% | 2598 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,294 psi | 67% | 2549 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 46,238 psi | 71% | 2539 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 49,284 psi | 76% | 2612 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,164 psi | 68% | 2536 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 53,243 psi | 82% | 2651 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,406 psi | 59% | 2418 fps | 98.3% |
| Vihtavuori N170 | <<locked>> | 92% | 49,255 psi | 76% | 2628 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 52,591 psi | 81% | 2654 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,207 psi | 66% | 2543 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,409 psi | 65% | 2582 fps | 97.3% |
| Vihtavuori N565 | <<locked>> | 82% | 37,391 psi | 58% | 2461 fps | 96% |
| Vihtavuori N568 | <<locked>> | 88% | 40,495 psi | 62% | 2562 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 47,877 psi | 74% | 2740 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,794 psi | 81% | 2605 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,853 psi | 84% | 2726 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,289 psi | 56% | 2513 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,524 psi | 62% | 2467 fps | 98.3% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Barnes TSX FB. Hodgdon Retumbo delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,907 fps. Accurate 8700 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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 76, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Barnes TSX FB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.