Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 175gr | Lehigh Defense Controlled Chaos 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 Accurate MAGPRO.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 57,450 psi | 88% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,117 psi | 89% | 2897 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,333 psi | 87% | 2963 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 88% | 55,158 psi | 85% | 2900 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 57,087 psi | 88% | 2963 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 2923 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,879 psi | 77% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,230 psi | 85% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,566 psi | 90% | 2943 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,392 psi | 88% | 2959 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,158 psi | 85% | 2874 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,955 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,782 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,765 psi | 81% | 2940 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,233 psi | 90% | 2917 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 56,521 psi | 87% | 2943 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 2992 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 57,392 psi | 88% | 2959 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,912 psi | 86% | 2844 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 57,087 psi | 88% | 2953 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,680 psi | 86% | 2894 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,030 psi | 89% | 2907 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 56,637 psi | 87% | 2900 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,608 psi | 86% | 2884 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,376 psi | 85% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,725 psi | 89% | 3068 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,550 psi | 87% | 2927 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 57% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,928 psi | 89% | 2884 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,101 psi | 88% | 2864 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,320 psi | 90% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,246 psi | 88% | 2881 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 55,230 psi | 85% | 2943 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,266 psi | 70% | 2795 fps | 97.9% |
| Lovex S065 | <<locked>> | 84% | 58,131 psi | 89% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,405 psi | 87% | 2861 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 58,726 psi | 90% | 2884 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,463 psi | 85% | 2884 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 45,788 psi | 70% | 2822 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 57,363 psi | 88% | 2976 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,130 psi | 86% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,086 psi | 86% | 2959 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 55,245 psi | 85% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 54,781 psi | 84% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,101 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,392 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,797 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 54,650 psi | 84% | 2999 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,595 psi | 90% | 3022 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 56,086 psi | 86% | 2871 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 58,030 psi | 89% | 2933 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,912 psi | 86% | 2844 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,131 psi | 89% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,405 psi | 87% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,203 psi | 88% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,609 psi | 89% | 2930 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,827 psi | 89% | 2858 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 57,290 psi | 88% | 2881 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,711 psi | 90% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,117 psi | 89% | 2802 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,928 psi | 89% | 2867 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,392 psi | 90% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 57,043 psi | 88% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,217 psi | 88% | 2904 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,956 psi | 88% | 2976 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 57,464 psi | 88% | 2956 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 98% | 54,810 psi | 84% | 2956 fps | 98.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,753 psi | 86% | 3012 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,551 psi | 89% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,883 psi | 86% | 2897 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,117 psi | 89% | 3005 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,726 psi | 90% | 2900 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% | 38,058 psi | 59% | 2546 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 50,531 psi | 78% | 2789 fps | 100% |
| Accurate MAGPRO | 79.8 gr | 82% | 42,177 psi | 65% | 2710 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 41,974 psi | 65% | 2671 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 40,350 psi | 62% | 2664 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 39,233 psi | 60% | 2628 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 31,067 psi | 48% | 2470 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,254 psi | 74% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,047 psi | 65% | 2664 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,971 psi | 58% | 2608 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,622 psi | 56% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,691 psi | 49% | 2487 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,959 psi | 63% | 2717 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,834 psi | 75% | 2871 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,196 psi | 74% | 2749 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 35,288 psi | 54% | 2546 fps | 95.2% |
| Bofors RP30 | <<locked>> | 88% | 38,609 psi | 59% | 2644 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 37,971 psi | 58% | 2608 fps | 96.4% |
| Bofors RP7 | <<locked>> | 80% | 52,475 psi | 81% | 2792 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,391 psi | 58% | 2592 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 52,040 psi | 80% | 2841 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,273 psi | 84% | 2851 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 40,103 psi | 62% | 2605 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,250 psi | 65% | 2651 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,440 psi | 70% | 2674 fps | 100% |
| Hodgdon Retumbo | 75.5 gr | 82% | 33,199 psi | 51% | 2566 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 52,533 psi | 81% | 2867 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,978 psi | 43% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,747 psi | 73% | 2723 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,635 psi | 83% | 2812 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,790 psi | 74% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,553 psi | 64% | 2608 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 38,885 psi | 60% | 2641 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,898 psi | 57% | 2618 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 51,256 psi | 79% | 2762 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,705 psi | 76% | 2756 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,677 psi | 50% | 2421 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 48,269 psi | 74% | 2766 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 32,198 psi | 50% | 2523 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 40,059 psi | 62% | 2680 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 49,211 psi | 76% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,711 psi | 60% | 2648 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 48,225 psi | 74% | 2772 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 32,169 psi | 50% | 2464 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,514 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,676 psi | 78% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,037 psi | 75% | 2828 fps | 100% |
| ReloadSwiss RS 76 | 80.8 gr | 82% | 32,460 psi | 50% | 2539 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,714 psi | 66% | 2753 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 43,221 psi | 67% | 2651 fps | 96.8% |
| Rottweil R 905 | <<locked>> | 80% | 41,539 psi | 64% | 2654 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 52,475 psi | 81% | 2792 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,256 psi | 79% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,705 psi | 76% | 2756 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,357 psi | 78% | 2713 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,205 psi | 63% | 2648 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 44,135 psi | 68% | 2635 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 46,586 psi | 72% | 2730 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,018 psi | 65% | 2635 fps | 98.4% |
| Vihtavuori N150 | <<locked>> | 80% | 54,534 psi | 84% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,676 psi | 78% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,492 psi | 56% | 2510 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,082 psi | 77% | 2769 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,017 psi | 63% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,016 psi | 62% | 2667 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 86% | 40,640 psi | 63% | 2661 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 43,947 psi | 68% | 2766 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 98% | 51,779 psi | 80% | 2943 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,111 psi | 77% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,185 psi | 80% | 2841 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,446 psi | 51% | 2602 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,580 psi | 59% | 2559 fps | 96.6% |
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 | Lehigh Defense Controlled Chaos. Hodgdon Retumbo delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,068 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 1:11.0 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, Accurate MAGPRO rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 175gr | Lehigh Defense Controlled Chaos 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.