Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Sako Hammerhead bullet and 67 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 80 and Vihtavuori N570.
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% | 57,827 psi | 89% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,044 psi | 89% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,797 psi | 87% | 2940 fps | 99% |
| ADI AR 2209 | <<locked>> | 86% | 55,259 psi | 85% | 2871 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 90% | 57,421 psi | 88% | 2936 fps | 99.6% |
| ADI AR 2217 | <<locked>> | 98% | 55,912 psi | 86% | 2907 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,620 psi | 81% | 2940 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,592 psi | 84% | 2927 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,434 psi | 85% | 2871 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,390 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,465 psi | 90% | 2913 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,798 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,724 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,811 psi | 86% | 2910 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,420 psi | 87% | 2927 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,349 psi | 90% | 2995 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,262 psi | 90% | 2897 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 56,971 psi | 88% | 2920 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,651 psi | 86% | 2920 fps | 99.7% |
| Bofors RP5 | <<locked>> | 90% | 57,798 psi | 89% | 2933 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,566 psi | 89% | 2930 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,608 psi | 87% | 2874 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,622 psi | 86% | 2858 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,535 psi | 85% | 2789 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,784 psi | 90% | 3045 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 58% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,682 psi | 89% | 2851 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,320 psi | 90% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,130 psi | 88% | 2854 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 90% | 55,564 psi | 86% | 2920 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,951 psi | 77% | 2844 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 57,783 psi | 89% | 2828 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,333 psi | 87% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,608 psi | 86% | 2812 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,288 psi | 85% | 2854 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 50,749 psi | 78% | 2867 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,943 psi | 89% | 2949 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,217 psi | 87% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,942 psi | 88% | 2940 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 55,259 psi | 85% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,506 psi | 85% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,435 psi | 59% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,436 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,913 psi | 88% | 2910 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,724 psi | 86% | 2976 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,245 psi | 85% | 2936 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 55,999 psi | 86% | 2844 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 58,305 psi | 90% | 2910 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,783 psi | 89% | 2828 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,333 psi | 87% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,840 psi | 87% | 2782 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,899 psi | 89% | 2904 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,566 psi | 89% | 2831 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 57,537 psi | 89% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,784 psi | 90% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,667 psi | 89% | 2835 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,697 psi | 90% | 2861 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,914 psi | 89% | 2874 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 56,956 psi | 88% | 2838 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,609 psi | 89% | 2874 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,406 psi | 88% | 2949 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 58,175 psi | 90% | 2936 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,767 psi | 86% | 2940 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 56,942 psi | 88% | 2999 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,406 psi | 88% | 2785 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,390 psi | 85% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,697 psi | 90% | 2874 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% | 41,104 psi | 63% | 2575 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 54,230 psi | 83% | 2812 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,496 psi | 65% | 2687 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 45,078 psi | 69% | 2703 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 40,350 psi | 62% | 2638 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 36,854 psi | 57% | 2552 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 48,733 psi | 75% | 2864 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 82% | 29,399 psi | 45% | 2398 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,440 psi | 70% | 2700 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,750 psi | 80% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,020 psi | 69% | 2697 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,017 psi | 63% | 2644 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,711 psi | 61% | 2595 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,345 psi | 53% | 2526 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,831 psi | 69% | 2753 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,180 psi | 71% | 2789 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,993 psi | 74% | 2726 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,218 psi | 59% | 2585 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 36,695 psi | 56% | 2569 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 41,017 psi | 63% | 2644 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 35,085 psi | 54% | 2513 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 42,975 psi | 66% | 2641 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,206 psi | 65% | 2625 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,675 psi | 75% | 2694 fps | 100% |
| Hodgdon Retumbo | 77 gr | 80% | 33,489 psi | 52% | 2549 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 43% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,778 psi | 78% | 2746 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,140 psi | 79% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,222 psi | 68% | 2638 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 39,030 psi | 60% | 2615 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,797 psi | 58% | 2608 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 54,244 psi | 83% | 2779 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,837 psi | 81% | 2779 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,273 psi | 54% | 2454 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 51,561 psi | 79% | 2795 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,850 psi | 47% | 2457 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 43,453 psi | 67% | 2713 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,634 psi | 81% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,030 psi | 60% | 2628 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,605 psi | 79% | 2799 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,969 psi | 54% | 2503 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,819 psi | 44% | 1709 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,549 psi | 84% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,968 psi | 82% | 2854 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,764 psi | 50% | 2523 fps | 97% |
| ReloadSwiss RS 80 | 91.4 gr | 88% | 40,538 psi | 62% | 2674 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 45,963 psi | 71% | 2677 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 44,512 psi | 69% | 2684 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,244 psi | 83% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,837 psi | 81% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,301 psi | 82% | 2733 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,179 psi | 68% | 2677 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 47,050 psi | 72% | 2664 fps | 97.6% |
| Somchem S365 | <<locked>> | 80% | 50,270 psi | 77% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,034 psi | 69% | 2661 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 54,012 psi | 83% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,247 psi | 60% | 2539 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 94% | 54,056 psi | 83% | 2815 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,447 psi | 82% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,237 psi | 68% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,236 psi | 67% | 2707 fps | 96.8% |
| Vihtavuori N565 | <<locked>> | 82% | 38,421 psi | 59% | 2585 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 41,727 psi | 64% | 2690 fps | 95.3% |
| Vihtavuori N570 | 93.9 gr | 94% | 49,139 psi | 76% | 2867 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,461 psi | 82% | 2733 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,405 psi | 58% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,379 psi | 64% | 2592 fps | 97.9% |
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 67 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 3,045 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,045 fps. ADI AR 2218 gives the best case fill at 100 %, and 67 of the 67 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 1:15.0 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 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Sako Hammerhead 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.