Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Norma PlastSpitz 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 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% | 57,348 psi | 88% | 2835 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,696 psi | 89% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,144 psi | 86% | 2930 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 58,639 psi | 90% | 2920 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,942 psi | 88% | 2930 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,535 psi | 85% | 2900 fps | 99.7% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2930 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,969 psi | 83% | 2920 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,711 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,218 psi | 90% | 2910 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,334 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,230 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,332 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,883 psi | 86% | 2923 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,537 psi | 89% | 2982 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,725 psi | 89% | 2887 fps | 98% |
| Bofors RP15 | <<locked>> | 92% | 56,507 psi | 87% | 2913 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,216 psi | 85% | 2913 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,334 psi | 88% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,639 psi | 90% | 2854 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,130 psi | 88% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,159 psi | 86% | 2867 fps | 99.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,230 psi | 85% | 2851 fps | 99% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,187 psi | 85% | 2785 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,276 psi | 90% | 3038 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,203 psi | 88% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,798 psi | 89% | 2844 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,695 psi | 87% | 2848 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 55,085 psi | 85% | 2910 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,342 psi | 76% | 2831 fps | 99% |
| Lovex S065 | <<locked>> | 82% | 57,493 psi | 88% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,869 psi | 86% | 2822 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,798 psi | 90% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,798 psi | 90% | 2904 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,125 psi | 77% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,464 psi | 88% | 2943 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,724 psi | 86% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,217 psi | 87% | 2930 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,653 psi | 90% | 2900 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,882 psi | 84% | 2861 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 59% | 1903 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,928 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,376 psi | 87% | 2904 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,230 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,665 psi | 84% | 2930 fps | 99% |
| Rottweil R 904 | <<locked>> | 86% | 55,521 psi | 85% | 2835 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 57,812 psi | 89% | 2900 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,639 psi | 90% | 2854 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,493 psi | 88% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,869 psi | 86% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,434 psi | 87% | 2779 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,392 psi | 88% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,188 psi | 88% | 2825 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 57,000 psi | 88% | 2841 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,320 psi | 90% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,392 psi | 88% | 2828 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,262 psi | 90% | 2854 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,377 psi | 88% | 2864 fps | 96.2% |
| Vihtavuori N550 | <<locked>> | 82% | 56,695 psi | 87% | 2835 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,116 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,942 psi | 88% | 2943 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 57,711 psi | 89% | 2930 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,158 psi | 85% | 2933 fps | 98.6% |
| Vihtavuori N570 | <<locked>> | 98% | 56,275 psi | 87% | 2989 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,956 psi | 88% | 2776 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,781 psi | 84% | 2923 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,262 psi | 90% | 2864 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% | 40,799 psi | 63% | 2569 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 53,882 psi | 83% | 2808 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,221 psi | 65% | 2684 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 44,614 psi | 69% | 2694 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,103 psi | 62% | 2631 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 36,651 psi | 56% | 2546 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 48,443 psi | 75% | 2858 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 29,182 psi | 45% | 2392 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,401 psi | 79% | 2812 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,744 psi | 69% | 2690 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,727 psi | 63% | 2641 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,378 psi | 61% | 2592 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,953 psi | 52% | 2516 fps | 98.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,512 psi | 69% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,327 psi | 76% | 2851 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,674 psi | 73% | 2717 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,811 psi | 58% | 2575 fps | 96.7% |
| Bofors RP30 | <<locked>> | 84% | 36,419 psi | 56% | 2562 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,727 psi | 63% | 2641 fps | 97.8% |
| Bofors RP7 | <<locked>> | 80% | 55,158 psi | 85% | 2805 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,722 psi | 53% | 2503 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 80% | 42,685 psi | 66% | 2635 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,916 psi | 65% | 2618 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,356 psi | 74% | 2690 fps | 100% |
| Hodgdon Retumbo | 76.5 gr | 80% | 33,257 psi | 51% | 2543 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 43% | 1667 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,299 psi | 77% | 2740 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 50,821 psi | 78% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,816 psi | 67% | 2628 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 38,740 psi | 60% | 2612 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,391 psi | 58% | 2602 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,954 psi | 83% | 2776 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,373 psi | 81% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,983 psi | 54% | 2448 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 51,111 psi | 79% | 2789 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,487 psi | 47% | 2448 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 43,178 psi | 66% | 2710 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,127 psi | 80% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,609 psi | 59% | 2618 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,111 psi | 79% | 2789 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,708 psi | 53% | 2500 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,027 psi | 83% | 2825 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,431 psi | 81% | 2848 fps | 100% |
| ReloadSwiss RS 76 | 81.9 gr | 80% | 32,547 psi | 50% | 2516 fps | 96.8% |
| ReloadSwiss RS 80 | 90.8 gr | 88% | 40,103 psi | 62% | 2664 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 45,701 psi | 70% | 2674 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,237 psi | 68% | 2677 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 80% | 55,158 psi | 85% | 2805 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,954 psi | 83% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,373 psi | 81% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,823 psi | 81% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,888 psi | 68% | 2674 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 46,673 psi | 72% | 2657 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 49,734 psi | 77% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,730 psi | 69% | 2657 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,722 psi | 83% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,001 psi | 60% | 2536 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 94% | 53,722 psi | 83% | 2805 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 52,997 psi | 82% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,932 psi | 68% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,975 psi | 66% | 2700 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 38,145 psi | 59% | 2579 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,292 psi | 64% | 2684 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 94% | 48,704 psi | 75% | 2858 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,229 psi | 82% | 2730 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,898 psi | 57% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,133 psi | 63% | 2585 fps | 97.8% |
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 68 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Norma PlastSpitz. Hodgdon Retumbo delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,038 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 180.0 gr projectile in 0.308" calls for a 1:14.0 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 76, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Norma PlastSpitz 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.