Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 190gr | Berger VLD Hunting bullet and 66 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% | 57,870 psi | 89% | 2779 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,204 psi | 90% | 2802 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,826 psi | 87% | 2881 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 55,259 psi | 85% | 2812 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 57,522 psi | 89% | 2877 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 55,941 psi | 86% | 2844 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,576 psi | 81% | 2884 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,418 psi | 84% | 2864 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,448 psi | 85% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,595 psi | 90% | 2851 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,870 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,854 psi | 86% | 2785 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,825 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,333 psi | 87% | 2864 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,146 psi | 89% | 2936 fps | 98.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,276 psi | 90% | 2835 fps | 98.4% |
| Bofors RP15 | <<locked>> | 92% | 57,043 psi | 88% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 55,651 psi | 86% | 2858 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 57,870 psi | 89% | 2871 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,566 psi | 89% | 2867 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,637 psi | 87% | 2812 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,608 psi | 86% | 2795 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,680 psi | 86% | 2726 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,784 psi | 90% | 2986 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 58% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,740 psi | 89% | 2785 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,349 psi | 90% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,203 psi | 88% | 2792 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 55,622 psi | 86% | 2858 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,821 psi | 77% | 2785 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 57,841 psi | 89% | 2766 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,246 psi | 87% | 2766 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,811 psi | 86% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,187 psi | 85% | 2789 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,633 psi | 78% | 2808 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,059 psi | 89% | 2887 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,159 psi | 86% | 2779 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,985 psi | 88% | 2877 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,143 psi | 85% | 2785 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,317 psi | 85% | 2808 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,479 psi | 59% | 1847 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,421 psi | 90% | 2818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,985 psi | 88% | 2848 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,738 psi | 86% | 2917 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,259 psi | 85% | 2881 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 86% | 56,101 psi | 86% | 2782 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 58,392 psi | 90% | 2844 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,841 psi | 89% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,246 psi | 87% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,797 psi | 87% | 2720 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,986 psi | 89% | 2841 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,653 psi | 89% | 2772 fps | 99.5% |
| Somchem S365 | <<locked>> | 84% | 57,638 psi | 89% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,755 psi | 90% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,870 psi | 89% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,639 psi | 90% | 2795 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,899 psi | 89% | 2815 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 82% | 57,014 psi | 88% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,653 psi | 89% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,522 psi | 89% | 2890 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 58,160 psi | 90% | 2874 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 55,782 psi | 86% | 2884 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 56,811 psi | 87% | 2940 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,290 psi | 88% | 2720 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,332 psi | 85% | 2864 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 54,926 psi | 85% | 2759 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% | 41,133 psi | 63% | 2520 fps | 99.7% |
| Accurate 4350 | <<locked>> | 80% | 54,302 psi | 84% | 2749 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,598 psi | 66% | 2635 fps | 96.4% |
| ADI AR 2209 | <<locked>> | 80% | 45,107 psi | 69% | 2644 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 80% | 40,451 psi | 62% | 2582 fps | 96.9% |
| ADI AR 2217 | <<locked>> | 84% | 34,563 psi | 53% | 2444 fps | 95% |
| ADI AR 2218 | <<locked>> | 98% | 48,733 psi | 75% | 2812 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 82% | 29,501 psi | 45% | 2356 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,895 psi | 80% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,092 psi | 69% | 2638 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,104 psi | 63% | 2592 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,856 psi | 61% | 2543 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,403 psi | 53% | 2474 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,005 psi | 69% | 2697 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,253 psi | 71% | 2740 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,991 psi | 69% | 2612 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 38,247 psi | 59% | 2533 fps | 97.3% |
| Bofors RP30 | <<locked>> | 82% | 34,330 psi | 53% | 2464 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 41,104 psi | 63% | 2592 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 82% | 35,114 psi | 54% | 2461 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 43,091 psi | 66% | 2585 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,293 psi | 65% | 2572 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,805 psi | 75% | 2635 fps | 100% |
| Hodgdon Retumbo | 74.4 gr | 80% | 33,576 psi | 52% | 2503 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 43% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,792 psi | 78% | 2684 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 51,169 psi | 79% | 2690 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,251 psi | 68% | 2582 fps | 97.4% |
| IMR 7828 SSC | <<locked>> | 80% | 39,117 psi | 60% | 2566 fps | 96.5% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,302 psi | 54% | 2503 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 54,375 psi | 84% | 2717 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,866 psi | 81% | 2713 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,447 psi | 55% | 2408 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 51,590 psi | 79% | 2733 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 30,951 psi | 48% | 2411 fps | 96% |
| Norma MRP | <<locked>> | 80% | 43,540 psi | 67% | 2657 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 52,634 psi | 81% | 2733 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,059 psi | 60% | 2572 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 80% | 51,590 psi | 79% | 2736 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,070 psi | 54% | 2457 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,621 psi | 84% | 2769 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,113 psi | 82% | 2795 fps | 100% |
| ReloadSwiss RS 76 | 79.7 gr | 80% | 32,909 psi | 51% | 2480 fps | 97.6% |
| ReloadSwiss RS 80 | 88.3 gr | 88% | 40,466 psi | 62% | 2625 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 46,151 psi | 71% | 2621 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 80% | 44,730 psi | 69% | 2628 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,375 psi | 84% | 2717 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,866 psi | 81% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,345 psi | 82% | 2671 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,382 psi | 68% | 2625 fps | 98.9% |
| Somchem S361 | <<locked>> | 80% | 47,166 psi | 73% | 2608 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 50,299 psi | 77% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,121 psi | 69% | 2605 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 54,085 psi | 83% | 2720 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,320 psi | 61% | 2487 fps | 98.2% |
| Vihtavuori N170 | <<locked>> | 94% | 54,143 psi | 83% | 2759 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 53,403 psi | 82% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,411 psi | 68% | 2618 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,323 psi | 67% | 2651 fps | 97.2% |
| Vihtavuori N565 | <<locked>> | 82% | 38,508 psi | 59% | 2533 fps | 96% |
| Vihtavuori N568 | <<locked>> | 88% | 41,698 psi | 64% | 2638 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 94% | 49,211 psi | 76% | 2812 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,650 psi | 83% | 2674 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,420 psi | 58% | 2589 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,510 psi | 64% | 2536 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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 190gr | Berger VLD Hunting. Hodgdon Retumbo delivers the highest muzzle velocity at 2,986 fps; across all powders the maximum-charge window runs from 1,804 fps to 2,986 fps. Accurate 8700 gives the best case fill at 100 %, and 73 of the 73 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 190.0 gr projectile in 0.308" calls for a 1:12.0 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 | 190gr | Berger VLD Hunting they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, 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.