Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Berger Elite Hunter 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>> | 90% | 55,477 psi | 85% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,883 psi | 86% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,363 psi | 90% | 2963 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 88% | 56,884 psi | 88% | 2897 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,013 psi | 85% | 2900 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,450 psi | 88% | 2927 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,924 psi | 80% | 2890 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,188 psi | 88% | 2890 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,855 psi | 88% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,550 psi | 87% | 2887 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,419 psi | 85% | 2900 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,014 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,116 psi | 88% | 2930 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,030 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,085 psi | 85% | 2946 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,188 psi | 86% | 2861 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 58,494 psi | 90% | 2940 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,855 psi | 88% | 2940 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,419 psi | 85% | 2900 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,261 psi | 88% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,969 psi | 85% | 2890 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 57,363 psi | 88% | 2887 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,494 psi | 90% | 2897 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,246 psi | 88% | 2877 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,116 psi | 88% | 2812 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,811 psi | 86% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,494 psi | 90% | 2923 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 58% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,709 psi | 86% | 2822 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,566 psi | 90% | 2854 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,347 psi | 87% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,187 psi | 85% | 2822 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 57,058 psi | 88% | 2940 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,210 psi | 73% | 2802 fps | 98.6% |
| Lovex S065 | <<locked>> | 82% | 56,115 psi | 86% | 2802 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,986 psi | 89% | 2851 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,884 psi | 88% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,072 psi | 88% | 2877 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 48,066 psi | 74% | 2828 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 55,492 psi | 85% | 2917 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,798 psi | 89% | 2867 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,378 psi | 90% | 2963 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,898 psi | 88% | 2874 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,927 psi | 88% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,072 psi | 86% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,668 psi | 90% | 2933 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,043 psi | 88% | 2999 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,565 psi | 87% | 2959 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 57,638 psi | 89% | 2864 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 56,028 psi | 86% | 2874 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,261 psi | 88% | 2835 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,115 psi | 86% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,986 psi | 89% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,726 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,637 psi | 86% | 2871 fps | 99.8% |
| Somchem S361 | <<locked>> | 86% | 55,622 psi | 86% | 2799 fps | 98.9% |
| Somchem S365 | <<locked>> | 84% | 55,216 psi | 85% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,492 psi | 87% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,724 psi | 86% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,492 psi | 87% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 55,143 psi | 85% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,405 psi | 85% | 2844 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,071 psi | 85% | 2913 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 55,767 psi | 86% | 2900 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 98% | 56,942 psi | 88% | 2959 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,175 psi | 90% | 3022 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,376 psi | 85% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,580 psi | 89% | 2890 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,347 psi | 87% | 2946 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,507 psi | 87% | 2841 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% | 39,465 psi | 61% | 2546 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 52,272 psi | 80% | 2782 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 40,611 psi | 63% | 2651 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 43,424 psi | 67% | 2671 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 38,841 psi | 60% | 2602 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 88% | 37,927 psi | 58% | 2575 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 84% | 30,168 psi | 46% | 2421 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,830 psi | 67% | 2671 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,748 psi | 77% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,424 psi | 67% | 2664 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,392 psi | 61% | 2612 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,101 psi | 59% | 2569 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,909 psi | 51% | 2493 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,685 psi | 66% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,268 psi | 73% | 2815 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,398 psi | 71% | 2690 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 36,651 psi | 56% | 2549 fps | 96.2% |
| Bofors RP30 | <<locked>> | 86% | 37,492 psi | 58% | 2589 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 39,392 psi | 61% | 2612 fps | 97.3% |
| Bofors RP7 | <<locked>> | 80% | 53,751 psi | 83% | 2782 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,027 psi | 55% | 2533 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 53,635 psi | 83% | 2831 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,466 psi | 64% | 2608 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,698 psi | 63% | 2592 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,007 psi | 72% | 2667 fps | 100% |
| Hodgdon Retumbo | 76.2 gr | 82% | 34,330 psi | 53% | 2572 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 54,201 psi | 83% | 2861 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,992 psi | 43% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,182 psi | 76% | 2720 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,071 psi | 85% | 2805 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,371 psi | 76% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,786 psi | 66% | 2608 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,492 psi | 58% | 2582 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,824 psi | 55% | 2569 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 52,736 psi | 81% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,155 psi | 79% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,837 psi | 52% | 2425 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 49,763 psi | 77% | 2762 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 31,343 psi | 48% | 2474 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 41,626 psi | 64% | 2680 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 50,807 psi | 78% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,188 psi | 57% | 2585 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 49,763 psi | 77% | 2769 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,446 psi | 51% | 2467 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 44% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,373 psi | 81% | 2802 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,792 psi | 78% | 2825 fps | 100% |
| ReloadSwiss RS 76 | 79.6 gr | 80% | 31,299 psi | 48% | 2480 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,437 psi | 64% | 2697 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 44,411 psi | 68% | 2648 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 42,830 psi | 66% | 2651 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 53,751 psi | 83% | 2782 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,736 psi | 81% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,155 psi | 79% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,532 psi | 79% | 2703 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,496 psi | 65% | 2648 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 45,426 psi | 70% | 2631 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 48,269 psi | 74% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,439 psi | 67% | 2631 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 52,257 psi | 80% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,797 psi | 58% | 2510 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,634 psi | 79% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,409 psi | 65% | 2641 fps | 100% |
| Vihtavuori N560 | 77.2 gr | 80% | 41,495 psi | 64% | 2671 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 39,450 psi | 61% | 2608 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 42,627 psi | 66% | 2713 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 96% | 50,125 psi | 77% | 2887 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,619 psi | 79% | 2710 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,824 psi | 83% | 2835 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,244 psi | 54% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,914 psi | 61% | 2562 fps | 97.4% |
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 | 180gr | Berger Elite Hunter. Vihtavuori N570 delivers the highest muzzle velocity at 3,022 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,022 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 58–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.308" calls for a 1:11.5 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 | Berger Elite Hunter 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.