Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | CutEdge LZR 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% | 55,883 psi | 86% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,594 psi | 87% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,911 psi | 85% | 2913 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 58,073 psi | 89% | 2913 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,985 psi | 86% | 2917 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,317 psi | 84% | 2881 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,602 psi | 75% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,957 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,406 psi | 88% | 2900 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,159 psi | 86% | 2910 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,667 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,696 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,639 psi | 90% | 2966 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,387 psi | 79% | 2890 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,348 psi | 88% | 2877 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 55,317 psi | 85% | 2897 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,203 psi | 88% | 2946 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 56,159 psi | 86% | 2910 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 58,465 psi | 90% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 55,869 psi | 86% | 2907 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 58,494 psi | 90% | 2904 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,014 psi | 88% | 2861 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,521 psi | 85% | 2854 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,334 psi | 90% | 2897 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,030 psi | 89% | 2822 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,420 psi | 87% | 3018 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,535 psi | 85% | 2884 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,086 psi | 57% | 1837 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,956 psi | 88% | 2838 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,289 psi | 87% | 2822 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,058 psi | 88% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,405 psi | 87% | 2838 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 58,044 psi | 89% | 2956 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,034 psi | 68% | 2746 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 57,130 psi | 88% | 2818 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,390 psi | 85% | 2815 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,203 psi | 88% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,421 psi | 90% | 2897 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 44,454 psi | 68% | 2772 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 56,333 psi | 87% | 2930 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,100 psi | 85% | 2831 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,926 psi | 85% | 2913 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 58,059 psi | 89% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,754 psi | 89% | 2904 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,942 psi | 58% | 1880 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,956 psi | 88% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,767 psi | 86% | 2897 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,638 psi | 89% | 3012 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,072 psi | 88% | 2972 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 55,100 psi | 85% | 2825 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 57,000 psi | 88% | 2890 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 58,465 psi | 90% | 2851 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,130 psi | 88% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,390 psi | 85% | 2815 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,289 psi | 87% | 2772 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,579 psi | 87% | 2884 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,782 psi | 87% | 2815 fps | 99% |
| Somchem S365 | <<locked>> | 86% | 56,043 psi | 86% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,377 psi | 88% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,101 psi | 88% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,782 psi | 87% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,232 psi | 88% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,101 psi | 86% | 2828 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,680 psi | 86% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,999 psi | 86% | 2930 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 56,217 psi | 87% | 2910 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,479 psi | 88% | 2969 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,259 psi | 84% | 2959 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,637 psi | 87% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,711 psi | 90% | 2907 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,797 psi | 87% | 2959 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,566 psi | 89% | 2858 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% | 36,666 psi | 56% | 2493 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 49,168 psi | 76% | 2740 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,017 psi | 63% | 2661 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 41,002 psi | 63% | 2625 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 39,247 psi | 60% | 2615 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 90% | 38,247 psi | 59% | 2585 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 30,081 psi | 46% | 2421 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,239 psi | 73% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,046 psi | 63% | 2621 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,883 psi | 57% | 2559 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,592 psi | 55% | 2523 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,632 psi | 47% | 2434 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,624 psi | 61% | 2664 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,427 psi | 73% | 2818 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,311 psi | 73% | 2707 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 34,185 psi | 53% | 2497 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 37,391 psi | 58% | 2592 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 36,883 psi | 57% | 2559 fps | 96.3% |
| Bofors RP7 | <<locked>> | 80% | 51,416 psi | 79% | 2746 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 36,347 psi | 56% | 2543 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 51,010 psi | 79% | 2795 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,388 psi | 82% | 2808 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 82% | 41,989 psi | 65% | 2621 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,191 psi | 63% | 2605 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,498 psi | 68% | 2631 fps | 100% |
| Hodgdon Retumbo | 76 gr | 84% | 34,360 psi | 53% | 2579 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 51,459 psi | 79% | 2822 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,833 psi | 43% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,818 psi | 72% | 2680 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,968 psi | 82% | 2772 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 46,775 psi | 72% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,625 psi | 63% | 2566 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 37,782 psi | 58% | 2592 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,218 psi | 59% | 2628 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 50,343 psi | 77% | 2720 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,573 psi | 75% | 2710 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 31,372 psi | 48% | 2369 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 47,340 psi | 73% | 2723 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 30,951 psi | 48% | 2467 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 38,957 psi | 60% | 2631 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 48,109 psi | 74% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,550 psi | 58% | 2595 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 47,239 psi | 73% | 2730 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 33,446 psi | 51% | 2474 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,559 psi | 76% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,906 psi | 74% | 2782 fps | 100% |
| ReloadSwiss RS 76 | 79.4 gr | 82% | 31,227 psi | 48% | 2480 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,481 psi | 64% | 2703 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 42,250 psi | 65% | 2605 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 40,437 psi | 62% | 2608 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 80% | 51,416 psi | 79% | 2746 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,343 psi | 77% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,573 psi | 75% | 2710 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,255 psi | 76% | 2667 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,103 psi | 62% | 2602 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 43,091 psi | 66% | 2592 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 45,382 psi | 70% | 2680 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,886 psi | 63% | 2585 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 80% | 53,447 psi | 82% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,632 psi | 76% | 2723 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,418 psi | 55% | 2461 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 49,037 psi | 75% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,668 psi | 61% | 2595 fps | 100% |
| Vihtavuori N560 | 75.2 gr | 80% | 39,001 psi | 60% | 2621 fps | 95% |
| Vihtavuori N565 | <<locked>> | 86% | 39,349 psi | 61% | 2612 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 92% | 42,714 psi | 66% | 2717 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 98% | 50,473 psi | 78% | 2897 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,110 psi | 76% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,198 psi | 79% | 2799 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,198 psi | 50% | 2549 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,565 psi | 58% | 2513 fps | 96.5% |
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 | 180gr | CutEdge LZR. Hodgdon Retumbo delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,018 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 180.0 gr projectile in 0.308" calls for a 1:10.0 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | CutEdge LZR 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.