Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | Frontier PH HPBT bullet and 71 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>> | 92% | 56,536 psi | 87% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,145 psi | 88% | 2956 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,245 psi | 85% | 3012 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 58,189 psi | 90% | 3015 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 56,130 psi | 86% | 3015 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 2976 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,023 psi | 75% | 2936 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 58,291 psi | 90% | 3009 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,073 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,595 psi | 89% | 2999 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,405 psi | 87% | 3012 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,015 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,754 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,621 psi | 84% | 3012 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,653 psi | 89% | 2972 fps | 97.1% |
| Bofors RP15 | <<locked>> | 94% | 55,579 psi | 86% | 2999 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,667 psi | 89% | 3048 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 56,405 psi | 87% | 3012 fps | 99.7% |
| Bofors RP7 | <<locked>> | 82% | 55,085 psi | 85% | 2900 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 56,086 psi | 86% | 3002 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 58,755 psi | 90% | 3012 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,203 psi | 88% | 2966 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 55,811 psi | 86% | 2956 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,508 psi | 90% | 2995 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,392 psi | 90% | 2933 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,579 psi | 87% | 3120 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,651 psi | 86% | 2986 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 1926 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,029 psi | 88% | 2940 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,420 psi | 87% | 2923 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,508 psi | 89% | 2946 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,579 psi | 87% | 2940 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 58,276 psi | 90% | 3058 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,512 psi | 69% | 2841 fps | 97.2% |
| Lovex S065 | <<locked>> | 84% | 57,363 psi | 88% | 2923 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,796 psi | 86% | 2920 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,812 psi | 89% | 2940 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,465 psi | 90% | 2999 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,904 psi | 69% | 2867 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 56,536 psi | 87% | 3031 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,448 psi | 85% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,129 psi | 85% | 3015 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 58,146 psi | 89% | 2995 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,059 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 59% | 1969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,450 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,738 psi | 86% | 3002 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,044 psi | 89% | 3114 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,450 psi | 88% | 3068 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 55,317 psi | 85% | 2927 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 57,276 psi | 88% | 2992 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 55,085 psi | 85% | 2900 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,363 psi | 88% | 2923 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,796 psi | 86% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,623 psi | 87% | 2877 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,840 psi | 87% | 2989 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 57,000 psi | 88% | 2913 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 56,202 psi | 86% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,696 psi | 89% | 2959 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 57,421 psi | 88% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,985 psi | 88% | 2927 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,624 psi | 89% | 2943 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,318 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,260 psi | 87% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,159 psi | 86% | 3028 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 96% | 56,652 psi | 87% | 3009 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 3071 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,826 psi | 87% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,755 psi | 90% | 3012 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,130 psi | 88% | 3064 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,943 psi | 89% | 2956 fps | 99.7% |
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% | 37,434 psi | 58% | 2592 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 49,821 psi | 77% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,585 psi | 69% | 2822 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 41,379 psi | 64% | 2723 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 84% | 42,511 psi | 65% | 2769 fps | 96% |
| ADI AR 2217 | <<locked>> | 92% | 41,321 psi | 64% | 2733 fps | 96% |
| ADI AR 2225 | <<locked>> | 88% | 32,663 psi | 50% | 2569 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,814 psi | 64% | 2723 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,413 psi | 73% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,423 psi | 64% | 2717 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,304 psi | 57% | 2654 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,868 psi | 55% | 2618 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,198 psi | 48% | 2526 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,118 psi | 62% | 2762 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,691 psi | 78% | 2854 fps | 95.4% |
| Bofors RP15 | <<locked>> | 82% | 37,130 psi | 57% | 2648 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 37,942 psi | 58% | 2687 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 37,304 psi | 57% | 2654 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 51,735 psi | 80% | 2851 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 39,421 psi | 61% | 2697 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 51,213 psi | 79% | 2894 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 53,592 psi | 82% | 2910 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 42,322 psi | 65% | 2713 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,568 psi | 64% | 2700 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,701 psi | 69% | 2730 fps | 100% |
| Hodgdon Retumbo | 79.1 gr | 84% | 34,780 psi | 54% | 2664 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 51,576 psi | 79% | 2920 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 43% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,152 psi | 73% | 2779 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,069 psi | 82% | 2874 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 47,137 psi | 73% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,017 psi | 63% | 2657 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 40,988 psi | 63% | 2749 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,711 psi | 60% | 2717 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,546 psi | 78% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,921 psi | 75% | 2812 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 32,126 psi | 49% | 2467 fps | 96.4% |
| Norma 204 | <<locked>> | 80% | 47,514 psi | 73% | 2822 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 33,837 psi | 52% | 2621 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 39,247 psi | 60% | 2723 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 48,385 psi | 74% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,741 psi | 63% | 2753 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 47,456 psi | 73% | 2828 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 33,997 psi | 52% | 2566 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 44% | 1768 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,806 psi | 77% | 2864 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,051 psi | 74% | 2884 fps | 100% |
| ReloadSwiss RS 76 | 82.7 gr | 82% | 31,821 psi | 49% | 2572 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 45,295 psi | 70% | 2861 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 42,511 psi | 65% | 2700 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 40,770 psi | 63% | 2700 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 51,735 psi | 80% | 2851 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,546 psi | 78% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,921 psi | 75% | 2812 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,545 psi | 76% | 2769 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,422 psi | 62% | 2697 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 43,410 psi | 67% | 2684 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 45,832 psi | 71% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,379 psi | 64% | 2684 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 53,722 psi | 83% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,966 psi | 77% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,940 psi | 55% | 2556 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 49,371 psi | 76% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,219 psi | 62% | 2697 fps | 99.9% |
| Vihtavuori N560 | 80.2 gr | 82% | 42,264 psi | 65% | 2776 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 42,888 psi | 66% | 2769 fps | 96% |
| Vihtavuori N568 | <<locked>> | 94% | 46,441 psi | 71% | 2874 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,414 psi | 76% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,401 psi | 79% | 2897 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,518 psi | 50% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,913 psi | 58% | 2605 fps | 95.9% |
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 71 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | Frontier PH HPBT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,120 fps; across all powders the maximum-charge window runs from 1,926 fps to 3,120 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 165.0 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, Bofors RP30 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 | 165gr | Frontier PH HPBT 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.