Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 175gr | Atomic 29 HP bullet and 72 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% | 56,304 psi | 87% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,927 psi | 88% | 2884 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,434 psi | 85% | 2953 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 58,320 psi | 90% | 2949 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 56,362 psi | 87% | 2956 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,650 psi | 84% | 2917 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,081 psi | 76% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,291 psi | 90% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,885 psi | 89% | 2936 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,521 psi | 87% | 2949 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,102 psi | 89% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,204 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,752 psi | 84% | 2943 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,851 psi | 80% | 2927 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,783 psi | 89% | 2913 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 55,680 psi | 86% | 2936 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 2986 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 56,521 psi | 87% | 2949 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 58,726 psi | 90% | 2890 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,260 psi | 87% | 2943 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,013 psi | 85% | 2887 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,261 psi | 88% | 2900 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,927 psi | 86% | 2890 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,711 psi | 90% | 2933 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,494 psi | 90% | 2864 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,826 psi | 87% | 3058 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,782 psi | 86% | 2917 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 57% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,348 psi | 88% | 2877 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,608 psi | 87% | 2861 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,493 psi | 88% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,608 psi | 87% | 2874 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 58,407 psi | 90% | 2992 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,425 psi | 68% | 2779 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 57,435 psi | 88% | 2858 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,666 psi | 86% | 2851 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,595 psi | 89% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,740 psi | 90% | 2936 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 44,831 psi | 69% | 2805 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 56,710 psi | 87% | 2969 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,405 psi | 85% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,448 psi | 85% | 2953 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 58,349 psi | 90% | 2930 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,320 psi | 90% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 59% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,508 psi | 89% | 2910 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,101 psi | 86% | 2936 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,262 psi | 90% | 3051 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,638 psi | 89% | 3009 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 55,448 psi | 85% | 2864 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 57,290 psi | 88% | 2927 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 58,726 psi | 90% | 2890 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,435 psi | 88% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,666 psi | 86% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,492 psi | 87% | 2808 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,855 psi | 88% | 2920 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,058 psi | 88% | 2851 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 56,478 psi | 87% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,827 psi | 89% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,464 psi | 88% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,029 psi | 88% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,754 psi | 89% | 2877 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,275 psi | 87% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,246 psi | 87% | 2894 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,333 psi | 87% | 2966 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 56,579 psi | 87% | 2946 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 3009 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 2999 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,855 psi | 88% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,216 psi | 85% | 2890 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,305 psi | 88% | 2995 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,131 psi | 89% | 2897 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% | 36,999 psi | 57% | 2526 fps | 98.4% |
| Accurate 4350 | <<locked>> | 80% | 49,574 psi | 76% | 2779 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,425 psi | 68% | 2759 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 41,350 psi | 64% | 2661 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 39,494 psi | 61% | 2648 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 38,464 psi | 59% | 2615 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 30,211 psi | 46% | 2448 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,485 psi | 73% | 2785 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,365 psi | 64% | 2654 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,173 psi | 57% | 2595 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,824 psi | 55% | 2556 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,908 psi | 48% | 2467 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,987 psi | 62% | 2697 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,935 psi | 74% | 2854 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,558 psi | 73% | 2740 fps | 95% |
| Bofors RP15 | <<locked>> | 82% | 36,999 psi | 57% | 2589 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 37,681 psi | 58% | 2625 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,173 psi | 57% | 2595 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 51,634 psi | 79% | 2782 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 36,608 psi | 56% | 2575 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 51,329 psi | 79% | 2831 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,722 psi | 83% | 2848 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 42,221 psi | 65% | 2654 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,423 psi | 64% | 2638 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,744 psi | 69% | 2667 fps | 100% |
| Hodgdon Retumbo | 77.9 gr | 84% | 34,679 psi | 53% | 2612 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 51,750 psi | 80% | 2861 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 43% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,166 psi | 73% | 2717 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,156 psi | 82% | 2808 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,007 psi | 72% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,930 psi | 63% | 2598 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 38,014 psi | 59% | 2625 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,522 psi | 59% | 2657 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 50,575 psi | 78% | 2756 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,950 psi | 75% | 2749 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 31,633 psi | 49% | 2402 fps | 96.7% |
| Norma 204 | <<locked>> | 80% | 47,616 psi | 73% | 2759 fps | 98.6% |
| Norma 217 | <<locked>> | 92% | 33,504 psi | 52% | 2559 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 39,233 psi | 60% | 2664 fps | 98.2% |
| Norma URP | <<locked>> | 80% | 48,515 psi | 75% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,739 psi | 58% | 2628 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 47,514 psi | 73% | 2766 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 33,750 psi | 52% | 2507 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1716 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,821 psi | 77% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,312 psi | 74% | 2822 fps | 100% |
| ReloadSwiss RS 76 | 81.4 gr | 82% | 31,546 psi | 49% | 2516 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,785 psi | 64% | 2733 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 42,438 psi | 65% | 2641 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 40,654 psi | 63% | 2638 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 51,634 psi | 79% | 2782 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,575 psi | 78% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,950 psi | 75% | 2749 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,429 psi | 76% | 2703 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,321 psi | 62% | 2635 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 43,410 psi | 67% | 2625 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 45,774 psi | 70% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,191 psi | 63% | 2621 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 53,853 psi | 83% | 2749 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,995 psi | 77% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,737 psi | 55% | 2497 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 49,327 psi | 76% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,900 psi | 61% | 2628 fps | 99.9% |
| Vihtavuori N560 | 78.9 gr | 82% | 42,206 psi | 65% | 2717 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 39,653 psi | 61% | 2644 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 92% | 43,134 psi | 66% | 2753 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 98% | 50,952 psi | 78% | 2933 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,458 psi | 76% | 2713 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,517 psi | 79% | 2835 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,532 psi | 50% | 2579 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,652 psi | 58% | 2546 fps | 96.3% |
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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 175gr | Atomic 29 HP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,058 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 175.0 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 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 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 175gr | Atomic 29 HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.