Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Norma VULKAN 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 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% | 58,015 psi | 89% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,218 psi | 90% | 2867 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,971 psi | 88% | 2943 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 86% | 55,448 psi | 85% | 2874 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 90% | 57,595 psi | 89% | 2943 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 56,072 psi | 86% | 2910 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,721 psi | 81% | 2940 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,405 psi | 85% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,653 psi | 90% | 2917 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,986 psi | 89% | 2936 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,912 psi | 86% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,985 psi | 86% | 2913 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,579 psi | 87% | 2930 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,508 psi | 90% | 2999 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,392 psi | 90% | 2897 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 57,145 psi | 88% | 2923 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,825 psi | 86% | 2920 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 57,986 psi | 89% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,754 psi | 89% | 2933 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,782 psi | 87% | 2877 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,608 psi | 86% | 2858 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,695 psi | 86% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 54,984 psi | 85% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 58% | 1860 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,856 psi | 89% | 2854 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,465 psi | 90% | 2858 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,246 psi | 88% | 2858 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 55,753 psi | 86% | 2920 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,111 psi | 77% | 2848 fps | 99.2% |
| Lovex S065 | <<locked>> | 82% | 57,957 psi | 89% | 2831 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,333 psi | 87% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,796 psi | 86% | 2815 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,259 psi | 85% | 2851 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 50,937 psi | 78% | 2871 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,131 psi | 89% | 2953 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,231 psi | 87% | 2844 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,130 psi | 88% | 2943 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 55,216 psi | 85% | 2851 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,666 psi | 86% | 2871 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,493 psi | 59% | 1906 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,421 psi | 90% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,058 psi | 88% | 2913 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,101 psi | 86% | 2982 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,448 psi | 85% | 2943 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 55,941 psi | 86% | 2844 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 58,450 psi | 90% | 2910 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,957 psi | 89% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,333 psi | 87% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,826 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,044 psi | 89% | 2907 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,725 psi | 89% | 2831 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 57,754 psi | 89% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,755 psi | 90% | 2877 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,870 psi | 89% | 2838 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,129 psi | 85% | 2812 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,030 psi | 89% | 2874 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 57,130 psi | 88% | 2841 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,783 psi | 89% | 2877 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,580 psi | 89% | 2953 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 58,334 psi | 90% | 2940 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,912 psi | 86% | 2943 fps | 98.8% |
| Vihtavuori N570 | <<locked>> | 98% | 57,087 psi | 88% | 3002 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,566 psi | 89% | 2785 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,593 psi | 86% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,027 psi | 85% | 2822 fps | 99.8% |
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% | 41,249 psi | 63% | 2579 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 54,433 psi | 84% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,612 psi | 66% | 2690 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 45,092 psi | 69% | 2703 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 40,509 psi | 62% | 2641 fps | 96.5% |
| ADI AR 2217 | <<locked>> | 86% | 36,999 psi | 57% | 2556 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 49,037 psi | 75% | 2871 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 82% | 29,515 psi | 45% | 2402 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,924 psi | 80% | 2818 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,179 psi | 70% | 2697 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,176 psi | 63% | 2648 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,885 psi | 61% | 2602 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,360 psi | 53% | 2526 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,005 psi | 69% | 2753 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 46,311 psi | 71% | 2792 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 48,066 psi | 74% | 2726 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,232 psi | 59% | 2585 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 36,811 psi | 57% | 2572 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 41,176 psi | 63% | 2648 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 35,085 psi | 54% | 2513 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 43,105 psi | 66% | 2644 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,337 psi | 65% | 2628 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,863 psi | 75% | 2697 fps | 100% |
| Hodgdon Retumbo | 77.2 gr | 80% | 33,634 psi | 52% | 2552 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,166 psi | 43% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,749 psi | 78% | 2746 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 51,329 psi | 79% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,208 psi | 68% | 2638 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 80% | 39,175 psi | 60% | 2621 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,375 psi | 54% | 2552 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 54,389 psi | 84% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,852 psi | 81% | 2779 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,447 psi | 55% | 2457 fps | 98.4% |
| Norma 204 | <<locked>> | 80% | 51,735 psi | 80% | 2799 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,966 psi | 48% | 2457 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 43,642 psi | 67% | 2717 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 52,620 psi | 81% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,030 psi | 60% | 2628 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,793 psi | 80% | 2802 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,114 psi | 54% | 2510 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,491 psi | 84% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,127 psi | 82% | 2858 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,895 psi | 51% | 2526 fps | 97.1% |
| ReloadSwiss RS 80 | 91.6 gr | 88% | 40,683 psi | 63% | 2677 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 46,151 psi | 71% | 2680 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 44,686 psi | 69% | 2687 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,389 psi | 84% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,852 psi | 81% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,243 psi | 82% | 2733 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,338 psi | 68% | 2684 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 47,181 psi | 73% | 2667 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 50,241 psi | 77% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,165 psi | 70% | 2664 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 54,186 psi | 83% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,421 psi | 61% | 2543 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 94% | 54,186 psi | 83% | 2815 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,447 psi | 82% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,411 psi | 68% | 2674 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,424 psi | 67% | 2710 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 38,551 psi | 59% | 2589 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 88% | 41,843 psi | 64% | 2694 fps | 95.3% |
| Vihtavuori N570 | 94.1 gr | 94% | 49,298 psi | 76% | 2871 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,621 psi | 83% | 2736 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,565 psi | 58% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,524 psi | 64% | 2595 fps | 98% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Norma VULKAN. Vihtavuori N570 delivers the highest muzzle velocity at 3,002 fps; across all powders the maximum-charge window runs from 1,860 fps to 3,002 fps. Accurate 8700 gives the best case fill at 100 %, and 72 of the 72 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. 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 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Norma VULKAN 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.