Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | Reichenberg HDB Universal bullet and 71 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 Vihtavuori N560.
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% | 54,998 psi | 85% | 2776 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,463 psi | 85% | 2802 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,247 psi | 90% | 2933 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 56,826 psi | 87% | 2867 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,027 psi | 85% | 2874 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2900 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,980 psi | 77% | 2864 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,837 psi | 80% | 2861 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,058 psi | 88% | 2861 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,449 psi | 87% | 2858 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,303 psi | 85% | 2867 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,869 psi | 88% | 2835 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,087 psi | 88% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,885 psi | 89% | 2920 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2920 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,217 psi | 87% | 2835 fps | 97.8% |
| Bofors RP15 | <<locked>> | 94% | 58,407 psi | 90% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,724 psi | 87% | 2907 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,303 psi | 85% | 2867 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,029 psi | 88% | 2805 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,143 psi | 85% | 2867 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,246 psi | 88% | 2858 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,465 psi | 90% | 2871 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,203 psi | 88% | 2851 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,971 psi | 88% | 2779 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,072 psi | 86% | 2979 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,465 psi | 90% | 2890 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 57% | 1827 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,825 psi | 86% | 2795 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,537 psi | 90% | 2825 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,072 psi | 86% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,114 psi | 85% | 2795 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 57,319 psi | 88% | 2913 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,181 psi | 73% | 2772 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 55,825 psi | 86% | 2772 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,711 psi | 89% | 2818 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,637 psi | 87% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,985 psi | 88% | 2848 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,805 psi | 74% | 2795 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 55,347 psi | 85% | 2887 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,638 psi | 89% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,436 psi | 90% | 2933 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 56,768 psi | 87% | 2844 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,058 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,232 psi | 59% | 1867 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,028 psi | 86% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,650 psi | 84% | 2851 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,087 psi | 88% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,420 psi | 87% | 2930 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 57,566 psi | 89% | 2835 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,086 psi | 86% | 2844 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,029 psi | 88% | 2805 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,825 psi | 86% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,711 psi | 89% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,711 psi | 90% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,695 psi | 86% | 2841 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 55,419 psi | 85% | 2769 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 55,187 psi | 85% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,434 psi | 87% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,535 psi | 85% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,376 psi | 87% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,682 psi | 90% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,798 psi | 90% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 54,969 psi | 85% | 2884 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 55,506 psi | 85% | 2871 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 57,072 psi | 88% | 2936 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 2992 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,274 psi | 85% | 2730 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,450 psi | 88% | 2861 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,594 psi | 87% | 2917 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,376 psi | 87% | 2812 fps | 99.9% |
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% | 38,827 psi | 60% | 2510 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 51,808 psi | 80% | 2749 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,422 psi | 62% | 2621 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 43,236 psi | 67% | 2641 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 38,566 psi | 59% | 2572 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 37,608 psi | 58% | 2546 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 46,485 psi | 72% | 2792 fps | 95% |
| ADI AR 2225 | <<locked>> | 84% | 29,660 psi | 46% | 2385 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,864 psi | 77% | 2756 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,192 psi | 66% | 2635 fps | 98.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,059 psi | 60% | 2582 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,724 psi | 58% | 2533 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,474 psi | 50% | 2457 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,337 psi | 65% | 2680 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,021 psi | 72% | 2782 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,398 psi | 71% | 2667 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 36,260 psi | 56% | 2516 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 34,577 psi | 53% | 2500 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,059 psi | 60% | 2582 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 53,519 psi | 82% | 2753 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 35,810 psi | 55% | 2510 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 53,476 psi | 82% | 2802 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,205 psi | 63% | 2579 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,437 psi | 62% | 2566 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,760 psi | 72% | 2638 fps | 100% |
| Hodgdon Retumbo | 74.4 gr | 80% | 31,691 psi | 49% | 2477 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 54,114 psi | 83% | 2831 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 43% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,979 psi | 75% | 2690 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,969 psi | 85% | 2776 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,023 psi | 75% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,554 psi | 65% | 2579 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 37,202 psi | 57% | 2552 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,404 psi | 54% | 2536 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 52,402 psi | 81% | 2723 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,836 psi | 78% | 2717 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,257 psi | 51% | 2388 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 49,617 psi | 76% | 2736 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 30,922 psi | 48% | 2441 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 41,321 psi | 64% | 2648 fps | 99% |
| Norma URP | <<locked>> | 80% | 50,575 psi | 78% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,970 psi | 57% | 2556 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 49,530 psi | 76% | 2736 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,996 psi | 51% | 2438 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,083 psi | 80% | 2769 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,662 psi | 78% | 2792 fps | 100% |
| ReloadSwiss RS 76 | 79.6 gr | 80% | 30,806 psi | 47% | 2448 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,104 psi | 63% | 2664 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 44,179 psi | 68% | 2618 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 42,511 psi | 65% | 2621 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,519 psi | 82% | 2753 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,402 psi | 81% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,836 psi | 78% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,401 psi | 79% | 2677 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,192 psi | 65% | 2618 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 45,150 psi | 69% | 2605 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 47,993 psi | 74% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,018 psi | 66% | 2602 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 52,025 psi | 80% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,391 psi | 58% | 2477 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 80% | 51,329 psi | 79% | 2730 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,930 psi | 65% | 2608 fps | 100% |
| Vihtavuori N560 | 77.2 gr | 80% | 41,205 psi | 63% | 2641 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 84% | 38,986 psi | 60% | 2575 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 42,337 psi | 65% | 2680 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 50,009 psi | 77% | 2858 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,474 psi | 79% | 2680 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,664 psi | 83% | 2805 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,882 psi | 54% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,566 psi | 61% | 2530 fps | 97.5% |
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 | 185gr | Reichenberg HDB Universal. Vihtavuori N570 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,827 fps to 2,992 fps. ADI AR 2217 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 185.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 185gr | Reichenberg HDB Universal they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.