Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Sellier & Bellot XRG bullet and 69 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% | 56,159 psi | 86% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,608 psi | 87% | 2841 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,798 psi | 90% | 2966 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 88% | 57,392 psi | 88% | 2900 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,593 psi | 86% | 2907 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,827 psi | 89% | 2930 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,547 psi | 81% | 2897 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,522 psi | 89% | 2894 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,435 psi | 88% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,855 psi | 88% | 2887 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,028 psi | 86% | 2904 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,653 psi | 89% | 2871 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,711 psi | 89% | 2936 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,508 psi | 90% | 2956 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2956 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,594 psi | 87% | 2864 fps | 97.6% |
| Bofors RP15 | <<locked>> | 92% | 55,230 psi | 85% | 2894 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 57,522 psi | 89% | 2946 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 56,028 psi | 86% | 2904 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,798 psi | 89% | 2838 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,550 psi | 85% | 2900 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,928 psi | 89% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 55,114 psi | 85% | 2844 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,798 psi | 89% | 2884 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,696 psi | 89% | 2815 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,463 psi | 87% | 3015 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,463 psi | 58% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,231 psi | 87% | 2825 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,724 psi | 87% | 2831 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,680 psi | 86% | 2828 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 57,667 psi | 89% | 2946 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,877 psi | 74% | 2808 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 56,463 psi | 87% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,552 psi | 90% | 2858 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,609 psi | 89% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,609 psi | 89% | 2881 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 2835 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,115 psi | 86% | 2923 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,392 psi | 90% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,752 psi | 84% | 2907 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 57,421 psi | 88% | 2877 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,566 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 59% | 1890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,695 psi | 87% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,085 psi | 85% | 2884 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,711 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,276 psi | 88% | 2969 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 58,146 psi | 89% | 2867 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,637 psi | 87% | 2881 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,798 psi | 89% | 2838 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,463 psi | 87% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,552 psi | 90% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,695 psi | 86% | 2762 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,217 psi | 87% | 2877 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,130 psi | 86% | 2805 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 55,840 psi | 86% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,101 psi | 88% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,275 psi | 87% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,898 psi | 88% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 55,521 psi | 85% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,898 psi | 86% | 2848 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,622 psi | 86% | 2920 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 56,420 psi | 87% | 2907 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 57,595 psi | 89% | 2969 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 98% | 54,578 psi | 84% | 2963 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,883 psi | 86% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,117 psi | 89% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,101 psi | 88% | 2953 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,101 psi | 88% | 2848 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% | 39,987 psi | 62% | 2552 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 52,765 psi | 81% | 2789 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,205 psi | 63% | 2661 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,787 psi | 67% | 2674 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 39,204 psi | 60% | 2608 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 38,464 psi | 59% | 2585 fps | 96% |
| ADI AR 2225 | <<locked>> | 84% | 30,661 psi | 47% | 2434 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,179 psi | 68% | 2674 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,299 psi | 77% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,801 psi | 67% | 2667 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,798 psi | 61% | 2618 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,537 psi | 59% | 2575 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,330 psi | 51% | 2500 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,337 psi | 67% | 2726 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,906 psi | 74% | 2825 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,804 psi | 72% | 2697 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,043 psi | 57% | 2556 fps | 96.3% |
| Bofors RP30 | <<locked>> | 84% | 35,491 psi | 55% | 2543 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 39,798 psi | 61% | 2618 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 54,273 psi | 84% | 2789 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,535 psi | 56% | 2543 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 54,201 psi | 83% | 2838 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,800 psi | 64% | 2612 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,060 psi | 63% | 2598 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,413 psi | 73% | 2674 fps | 100% |
| Hodgdon Retumbo | 74.4 gr | 80% | 32,518 psi | 50% | 2520 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 43% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,472 psi | 76% | 2723 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 49,966 psi | 77% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,091 psi | 66% | 2612 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,014 psi | 59% | 2589 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,448 psi | 56% | 2579 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 53,069 psi | 82% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,561 psi | 79% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,490 psi | 53% | 2434 fps | 98% |
| Norma 204 | <<locked>> | 80% | 50,299 psi | 77% | 2769 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 31,981 psi | 49% | 2487 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 42,235 psi | 65% | 2690 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 51,198 psi | 79% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,739 psi | 58% | 2595 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 50,299 psi | 77% | 2776 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,895 psi | 52% | 2477 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 44% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,011 psi | 82% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,343 psi | 79% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 79.7 gr | 80% | 31,850 psi | 49% | 2497 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,090 psi | 65% | 2710 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 44,904 psi | 69% | 2654 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 43,410 psi | 67% | 2661 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 54,273 psi | 84% | 2789 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,069 psi | 82% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,561 psi | 79% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,069 psi | 80% | 2710 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,062 psi | 66% | 2657 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 45,963 psi | 71% | 2638 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 48,704 psi | 75% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,845 psi | 67% | 2638 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 52,605 psi | 81% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,189 psi | 59% | 2516 fps | 97.4% |
| Vihtavuori N550 | <<locked>> | 80% | 51,982 psi | 80% | 2766 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,076 psi | 66% | 2651 fps | 100% |
| Vihtavuori N560 | 77.3 gr | 80% | 42,061 psi | 65% | 2680 fps | 96.3% |
| Vihtavuori N565 | <<locked>> | 84% | 40,089 psi | 62% | 2618 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 43,250 psi | 67% | 2720 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 50,749 psi | 78% | 2894 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,141 psi | 80% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,201 psi | 83% | 2838 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,911 psi | 55% | 2618 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,292 psi | 62% | 2566 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 69 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Sellier & Bellot XRG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,015 fps. ADI AR 2217 gives the best case fill at 100 %, and 69 of the 69 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 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Sellier & Bellot XRG 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.