Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Hornady ELD-X bullet and 68 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 80 and Vihtavuori N570.
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% | 58,233 psi | 90% | 2723 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,653 psi | 90% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 57,174 psi | 88% | 2825 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 55,782 psi | 86% | 2756 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 57,957 psi | 89% | 2822 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 56,289 psi | 87% | 2792 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 2835 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,911 psi | 85% | 2815 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,898 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,956 psi | 86% | 2743 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,361 psi | 85% | 2746 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,320 psi | 90% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,115 psi | 86% | 2726 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,231 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,927 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2881 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 49,632 psi | 76% | 2740 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 58,566 psi | 90% | 2782 fps | 98.7% |
| Bofors RP15 | <<locked>> | 92% | 57,479 psi | 88% | 2802 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,130 psi | 86% | 2805 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 58,320 psi | 90% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,914 psi | 89% | 2812 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,159 psi | 88% | 2759 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,898 psi | 86% | 2743 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,014 psi | 86% | 2667 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,129 psi | 85% | 2871 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,536 psi | 58% | 1755 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,160 psi | 90% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,129 psi | 85% | 2684 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,580 psi | 89% | 2740 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 56,043 psi | 86% | 2802 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,169 psi | 77% | 2736 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 58,276 psi | 90% | 2707 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,768 psi | 87% | 2710 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,101 psi | 86% | 2694 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,680 psi | 86% | 2736 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2759 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,363 psi | 90% | 2828 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,666 psi | 87% | 2723 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,348 psi | 88% | 2822 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 55,651 psi | 86% | 2733 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 55,883 psi | 86% | 2756 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,508 psi | 59% | 1795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,798 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,435 psi | 88% | 2789 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,072 psi | 86% | 2861 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 55,564 psi | 86% | 2828 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 56,391 psi | 87% | 2726 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 55,027 psi | 85% | 2736 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,276 psi | 90% | 2707 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,768 psi | 87% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,130 psi | 88% | 2661 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,407 psi | 90% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,856 psi | 89% | 2717 fps | 99.6% |
| Somchem S365 | <<locked>> | 84% | 58,117 psi | 89% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,390 psi | 85% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,233 psi | 90% | 2710 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,347 psi | 85% | 2694 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,131 psi | 89% | 2762 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 82% | 57,479 psi | 88% | 2720 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,059 psi | 89% | 2753 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,798 psi | 89% | 2835 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 94% | 58,653 psi | 90% | 2822 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 56,086 psi | 86% | 2828 fps | 99.2% |
| Vihtavuori N570 | <<locked>> | 98% | 57,217 psi | 88% | 2887 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,740 psi | 89% | 2661 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 55,767 psi | 86% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,259 psi | 85% | 2703 fps | 100% |
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% | 41,568 psi | 64% | 2474 fps | 99.8% |
| Accurate 4350 | <<locked>> | 80% | 54,795 psi | 84% | 2690 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,917 psi | 66% | 2589 fps | 96.9% |
| ADI AR 2209 | <<locked>> | 80% | 45,527 psi | 70% | 2595 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 80% | 40,857 psi | 63% | 2539 fps | 97.4% |
| ADI AR 2217 | <<locked>> | 84% | 34,882 psi | 54% | 2405 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 45,556 psi | 70% | 2697 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 27,876 psi | 43% | 2260 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,890 psi | 71% | 2592 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,301 psi | 80% | 2697 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,484 psi | 70% | 2589 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,539 psi | 64% | 2546 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,205 psi | 62% | 2490 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,766 psi | 54% | 2431 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,440 psi | 70% | 2644 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 43,105 psi | 66% | 2631 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 98% | 46,035 psi | 71% | 2677 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,324 psi | 70% | 2566 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 38,624 psi | 59% | 2487 fps | 97.8% |
| Bofors RP30 | <<locked>> | 82% | 34,664 psi | 53% | 2421 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 41,539 psi | 64% | 2546 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 33,054 psi | 51% | 2362 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 43,352 psi | 67% | 2536 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,714 psi | 66% | 2523 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,139 psi | 76% | 2575 fps | 100% |
| Hodgdon Retumbo | 72.4 gr | 80% | 33,968 psi | 52% | 2464 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,253 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,184 psi | 79% | 2631 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,619 psi | 79% | 2635 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,585 psi | 69% | 2533 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,552 psi | 61% | 2520 fps | 97.1% |
| IMR 8133 Enduron | <<locked>> | 88% | 33,286 psi | 51% | 2405 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 54,708 psi | 84% | 2657 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,243 psi | 82% | 2661 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,795 psi | 55% | 2362 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 51,953 psi | 80% | 2680 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 29,095 psi | 45% | 2316 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 43,947 psi | 68% | 2608 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 53,069 psi | 82% | 2674 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,450 psi | 61% | 2526 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 80% | 51,967 psi | 80% | 2680 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,462 psi | 55% | 2415 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,877 psi | 44% | 1611 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,911 psi | 85% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,476 psi | 82% | 2736 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 33,185 psi | 51% | 2438 fps | 98.1% |
| ReloadSwiss RS 80 | 83.9 gr | 86% | 37,768 psi | 58% | 2516 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 46,470 psi | 72% | 2569 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 80% | 44,962 psi | 69% | 2575 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,708 psi | 84% | 2657 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,243 psi | 82% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,563 psi | 82% | 2615 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,614 psi | 69% | 2572 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 47,427 psi | 73% | 2559 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 50,763 psi | 78% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,542 psi | 70% | 2556 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 54,534 psi | 84% | 2664 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,682 psi | 61% | 2441 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 50,836 psi | 78% | 2651 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,925 psi | 83% | 2671 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,802 psi | 69% | 2566 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,714 psi | 67% | 2605 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 80% | 36,216 psi | 56% | 2434 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 86% | 39,146 psi | 60% | 2536 fps | 95.3% |
| Vihtavuori N570 | 86.4 gr | 92% | 46,064 psi | 71% | 2703 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,983 psi | 83% | 2618 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,884 psi | 58% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,814 psi | 64% | 2490 fps | 98.6% |
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 68 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Hornady ELD-X. Vihtavuori N570 delivers the highest muzzle velocity at 2,887 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,887 fps. ADI AR 2218 gives the best case fill at 100 %, and 68 of the 68 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 200.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, 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 80, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Hornady ELD-X 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.