Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Hornady InterLock RN bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 and ReloadSwiss RS 76.
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% | 58,755 psi | 90% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,914 psi | 89% | 2956 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 86% | 56,231 psi | 87% | 2887 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 58,581 psi | 90% | 2956 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 56,985 psi | 88% | 2923 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,809 psi | 83% | 2963 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,840 psi | 86% | 2943 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 56,333 psi | 87% | 2884 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 56,115 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,724 psi | 86% | 2874 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 55,042 psi | 85% | 2890 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,724 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,985 psi | 88% | 2927 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,667 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 55,347 psi | 85% | 2949 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,477 psi | 85% | 2854 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 58,102 psi | 89% | 2936 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,797 psi | 87% | 2933 fps | 99.8% |
| Bofors RP5 | <<locked>> | 88% | 55,042 psi | 85% | 2890 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 94% | 54,679 psi | 84% | 2890 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 88% | 57,522 psi | 89% | 2887 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,536 psi | 87% | 2874 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,391 psi | 87% | 2802 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 56,014 psi | 86% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,608 psi | 58% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,407 psi | 90% | 2864 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,477 psi | 85% | 2818 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,957 psi | 89% | 2867 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 56,739 psi | 87% | 2936 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 51,010 psi | 79% | 2858 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 58,552 psi | 90% | 2841 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 57,116 psi | 88% | 2844 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,594 psi | 87% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 82% | 56,043 psi | 86% | 2864 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,895 psi | 80% | 2884 fps | 100% |
| Norma MRP | <<locked>> | 86% | 55,143 psi | 85% | 2910 fps | 100% |
| Norma URP | <<locked>> | 82% | 57,087 psi | 88% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,972 psi | 89% | 2956 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 56,014 psi | 86% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,623 psi | 87% | 2887 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,943 psi | 89% | 2923 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 57,072 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,710 psi | 87% | 2959 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 86% | 56,710 psi | 87% | 2858 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 55,521 psi | 85% | 2867 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,552 psi | 90% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 57,116 psi | 88% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,566 psi | 89% | 2795 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 55,129 psi | 85% | 2864 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 58,494 psi | 90% | 2844 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 58,465 psi | 90% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,869 psi | 86% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,508 psi | 90% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,811 psi | 86% | 2822 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 57,943 psi | 89% | 2854 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,668 psi | 90% | 2887 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,508 psi | 90% | 2966 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 55,506 psi | 85% | 2897 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 96% | 57,014 psi | 88% | 2959 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 58,204 psi | 90% | 3018 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 58,262 psi | 90% | 2795 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,797 psi | 87% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,753 psi | 86% | 2831 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% | 41,858 psi | 64% | 2592 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 80% | 43,352 psi | 67% | 2707 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 45,861 psi | 71% | 2720 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 41,075 psi | 63% | 2651 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 37,594 psi | 58% | 2569 fps | 96% |
| ADI AR 2218 | <<locked>> | 98% | 49,893 psi | 77% | 2887 fps | 96.3% |
| ADI AR 2225 | <<locked>> | 82% | 30,037 psi | 46% | 2418 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 46,209 psi | 71% | 2717 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,663 psi | 81% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,774 psi | 70% | 2710 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,771 psi | 64% | 2661 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,538 psi | 62% | 2608 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 35,056 psi | 54% | 2543 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,847 psi | 71% | 2766 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,311 psi | 73% | 2812 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,643 psi | 70% | 2680 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 38,827 psi | 60% | 2598 fps | 97.2% |
| Bofors RP30 | <<locked>> | 82% | 34,911 psi | 54% | 2526 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 41,771 psi | 64% | 2661 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 35,694 psi | 55% | 2530 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 80% | 43,671 psi | 67% | 2654 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,902 psi | 66% | 2641 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,400 psi | 76% | 2703 fps | 100% |
| Hodgdon Retumbo | 78.2 gr | 80% | 34,156 psi | 53% | 2569 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 43% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,547 psi | 79% | 2762 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 51,996 psi | 80% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,889 psi | 69% | 2651 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 39,769 psi | 61% | 2635 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 90% | 36,042 psi | 55% | 2569 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 55,013 psi | 85% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,461 psi | 82% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,042 psi | 55% | 2474 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 52,315 psi | 81% | 2808 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 31,502 psi | 48% | 2470 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 44,440 psi | 68% | 2733 fps | 99.5% |
| Norma URP | <<locked>> | 80% | 53,316 psi | 82% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,769 psi | 61% | 2641 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 80% | 52,373 psi | 81% | 2808 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,810 psi | 55% | 2523 fps | 97.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 44% | 1716 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,983 psi | 83% | 2871 fps | 100% |
| ReloadSwiss RS 76 | 83.7 gr | 80% | 33,489 psi | 52% | 2543 fps | 97.4% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,495 psi | 64% | 2690 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 46,717 psi | 72% | 2694 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 45,310 psi | 70% | 2700 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 55,013 psi | 85% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,461 psi | 82% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 54,027 psi | 83% | 2746 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,976 psi | 69% | 2694 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 47,819 psi | 74% | 2680 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 51,140 psi | 79% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,774 psi | 70% | 2674 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 54,853 psi | 84% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,943 psi | 61% | 2552 fps | 98.1% |
| Vihtavuori N550 | <<locked>> | 80% | 54,244 psi | 83% | 2802 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,121 psi | 69% | 2687 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 44,164 psi | 68% | 2723 fps | 97.1% |
| Vihtavuori N565 | <<locked>> | 82% | 39,233 psi | 60% | 2602 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 88% | 42,569 psi | 66% | 2707 fps | 95.7% |
| Vihtavuori N570 | 95.4 gr | 94% | 50,357 psi | 78% | 2887 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,346 psi | 84% | 2746 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,334 psi | 59% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 42,221 psi | 65% | 2608 fps | 98.2% |
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 64 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Hornady InterLock RN. Vihtavuori N570 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,018 fps. ADI AR 2218 gives the best case fill at 100 %, and 64 of the 64 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 1:16.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Hornady InterLock RN 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.