Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 171gr | Peregrine VLR-5 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% | 55,434 psi | 85% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,086 psi | 86% | 2904 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,479 psi | 90% | 3025 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 90% | 57,522 psi | 89% | 2966 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 55,492 psi | 85% | 2969 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2930 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,225 psi | 74% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,435 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,740 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,855 psi | 88% | 2949 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,637 psi | 86% | 2963 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,174 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,927 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,088 psi | 89% | 3018 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,101 psi | 88% | 2927 fps | 97.2% |
| Bofors RP15 | <<locked>> | 96% | 58,581 psi | 90% | 3002 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,797 psi | 87% | 2995 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 55,637 psi | 86% | 2963 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 58,073 psi | 89% | 2907 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 55,288 psi | 85% | 2956 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 57,914 psi | 89% | 2959 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,579 psi | 87% | 2917 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 55,129 psi | 85% | 2907 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,870 psi | 89% | 2946 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,667 psi | 89% | 2881 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,796 psi | 86% | 3068 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,911 psi | 85% | 2933 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 57% | 1886 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,434 psi | 87% | 2890 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,970 psi | 86% | 2877 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,507 psi | 87% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,927 psi | 86% | 2890 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 57,464 psi | 88% | 3005 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,540 psi | 67% | 2789 fps | 97.2% |
| Lovex S065 | <<locked>> | 84% | 56,536 psi | 87% | 2874 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,581 psi | 90% | 2920 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,695 psi | 87% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,725 psi | 89% | 2946 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,888 psi | 68% | 2815 fps | 99.1% |
| Norma MRP | <<locked>> | 90% | 55,738 psi | 86% | 2982 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,363 psi | 90% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,230 psi | 83% | 2963 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,334 psi | 88% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,246 psi | 88% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 58% | 1932 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,478 psi | 87% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,172 psi | 85% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,130 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,434 psi | 87% | 3015 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 90% | 58,392 psi | 90% | 2936 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 56,449 psi | 87% | 2943 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 58,073 psi | 89% | 2907 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,536 psi | 87% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,581 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,854 psi | 86% | 2828 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,028 psi | 86% | 2936 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 56,333 psi | 87% | 2867 fps | 98.7% |
| Somchem S365 | <<locked>> | 86% | 55,405 psi | 85% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,000 psi | 88% | 2910 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,594 psi | 87% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,275 psi | 87% | 2877 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,710 psi | 87% | 2890 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 55,535 psi | 85% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,143 psi | 85% | 2907 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,434 psi | 85% | 2979 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 55,651 psi | 86% | 2959 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,043 psi | 88% | 3022 fps | 98.4% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,824 psi | 83% | 3009 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,115 psi | 86% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,117 psi | 89% | 2959 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,115 psi | 86% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,043 psi | 88% | 2907 fps | 99.7% |
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% | 36,245 psi | 56% | 2533 fps | 98.1% |
| Accurate 4350 | <<locked>> | 80% | 48,660 psi | 75% | 2792 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,642 psi | 67% | 2769 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 40,596 psi | 62% | 2671 fps | 96.9% |
| ADI AR 2213 | <<locked>> | 82% | 38,899 psi | 60% | 2657 fps | 95% |
| ADI AR 2217 | <<locked>> | 92% | 40,567 psi | 62% | 2684 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 88% | 31,734 psi | 49% | 2513 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,789 psi | 72% | 2805 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,491 psi | 84% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,625 psi | 63% | 2664 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,419 psi | 56% | 2602 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,041 psi | 54% | 2566 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,284 psi | 47% | 2470 fps | 96.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,204 psi | 60% | 2710 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,212 psi | 77% | 2812 fps | 95.5% |
| Bofors RP15 | <<locked>> | 82% | 36,245 psi | 56% | 2595 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 36,956 psi | 57% | 2631 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 36,419 psi | 56% | 2602 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 51,039 psi | 79% | 2802 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 88% | 38,580 psi | 59% | 2644 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 50,430 psi | 78% | 2844 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 52,866 psi | 81% | 2861 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 82% | 41,597 psi | 64% | 2667 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 40,828 psi | 63% | 2651 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,947 psi | 68% | 2684 fps | 100% |
| Hodgdon Retumbo | 77.9 gr | 84% | 33,968 psi | 52% | 2615 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,778 psi | 78% | 2871 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 43% | 1696 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,427 psi | 71% | 2730 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,359 psi | 81% | 2825 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,151 psi | 71% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,263 psi | 62% | 2612 fps | 95% |
| IMR 7828 SSC | <<locked>> | 84% | 40,103 psi | 62% | 2694 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 96% | 37,782 psi | 58% | 2667 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,792 psi | 77% | 2769 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,182 psi | 74% | 2762 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,980 psi | 48% | 2408 fps | 96.2% |
| Norma 204 | <<locked>> | 80% | 46,789 psi | 72% | 2772 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 32,808 psi | 50% | 2566 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 38,377 psi | 59% | 2671 fps | 97.7% |
| Norma URP | <<locked>> | 80% | 47,659 psi | 73% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,987 psi | 62% | 2703 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 46,673 psi | 72% | 2776 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,127 psi | 51% | 2513 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 44% | 1736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,066 psi | 76% | 2815 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,355 psi | 73% | 2831 fps | 100% |
| ReloadSwiss RS 76 | 83.4 gr | 84% | 33,286 psi | 51% | 2585 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,309 psi | 68% | 2808 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 80% | 41,872 psi | 64% | 2651 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 40,016 psi | 62% | 2651 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 51,039 psi | 79% | 2802 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,792 psi | 77% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,182 psi | 74% | 2762 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,820 psi | 75% | 2720 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,682 psi | 61% | 2644 fps | 96.8% |
| Somchem S361 | <<locked>> | 80% | 42,685 psi | 66% | 2635 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 44,889 psi | 69% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,422 psi | 62% | 2631 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 53,026 psi | 82% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,153 psi | 76% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,041 psi | 54% | 2503 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 48,486 psi | 75% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,247 psi | 60% | 2641 fps | 99.8% |
| Vihtavuori N560 | 79 gr | 82% | 41,495 psi | 64% | 2726 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 41,843 psi | 64% | 2713 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 94% | 45,542 psi | 70% | 2825 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 49,966 psi | 77% | 2943 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,588 psi | 75% | 2726 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,618 psi | 78% | 2848 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,546 psi | 49% | 2582 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,072 psi | 57% | 2556 fps | 95.9% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 171gr | Peregrine VLR-5. Hodgdon Retumbo delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,068 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 171.0 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 171gr | Peregrine VLR-5 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.