Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 187gr | Peregrine VLR5 (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 IMR 7828 SSC.
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% | 57,986 psi | 89% | 2802 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,740 psi | 90% | 2831 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,087 psi | 88% | 2904 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 88% | 56,144 psi | 86% | 2841 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 58,146 psi | 89% | 2907 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,434 psi | 87% | 2874 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,836 psi | 78% | 2835 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,275 psi | 87% | 2838 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,159 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,637 psi | 86% | 2831 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,262 psi | 90% | 2897 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,999 psi | 86% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,101 psi | 86% | 2874 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,811 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,737 psi | 83% | 2890 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,332 psi | 85% | 2808 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 57,406 psi | 88% | 2884 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 55,811 psi | 86% | 2884 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 58,262 psi | 90% | 2897 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 56,463 psi | 87% | 2782 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 58,117 psi | 89% | 2897 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 56,463 psi | 87% | 2831 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 57,493 psi | 88% | 2841 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,434 psi | 87% | 2825 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,159 psi | 86% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,839 psi | 84% | 2953 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,421 psi | 88% | 2864 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,784 psi | 90% | 2818 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,972 psi | 89% | 2802 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,303 psi | 85% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,146 psi | 89% | 2825 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 92% | 56,260 psi | 87% | 2887 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,108 psi | 71% | 2746 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 58,682 psi | 90% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,956 psi | 88% | 2795 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,622 psi | 86% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,304 psi | 87% | 2825 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 46,702 psi | 72% | 2766 fps | 99.8% |
| Norma MRP | <<locked>> | 90% | 58,363 psi | 90% | 2917 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,826 psi | 87% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,363 psi | 88% | 2904 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 56,072 psi | 86% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,709 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 59% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,085 psi | 85% | 2795 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,769 psi | 89% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,999 psi | 86% | 2943 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,245 psi | 85% | 2900 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 56,927 psi | 88% | 2812 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 55,187 psi | 85% | 2822 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 56,463 psi | 87% | 2782 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,682 psi | 90% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,956 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,783 psi | 89% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,610 psi | 90% | 2867 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 58,581 psi | 90% | 2802 fps | 99.4% |
| Somchem S365 | <<locked>> | 86% | 58,204 psi | 90% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,622 psi | 86% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,682 psi | 90% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,419 psi | 85% | 2772 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 58,349 psi | 90% | 2838 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 84% | 57,769 psi | 89% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,841 psi | 89% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,943 psi | 89% | 2917 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 96% | 58,407 psi | 90% | 2900 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 98% | 55,825 psi | 86% | 2904 fps | 98.8% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,913 psi | 88% | 2959 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,552 psi | 90% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,681 psi | 87% | 2835 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,100 psi | 85% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,666 psi | 86% | 2789 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% | 38,101 psi | 59% | 2484 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 50,923 psi | 78% | 2723 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 39,595 psi | 61% | 2595 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 42,627 psi | 66% | 2618 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 37,898 psi | 58% | 2546 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 88% | 36,927 psi | 57% | 2520 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 29,182 psi | 45% | 2362 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,873 psi | 66% | 2615 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,124 psi | 76% | 2733 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,453 psi | 65% | 2608 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,319 psi | 59% | 2556 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,072 psi | 57% | 2513 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,966 psi | 49% | 2434 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,582 psi | 64% | 2657 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 45,977 psi | 71% | 2753 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 45,701 psi | 70% | 2641 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 35,679 psi | 55% | 2493 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 36,463 psi | 56% | 2533 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 38,319 psi | 59% | 2556 fps | 97.2% |
| Bofors RP7 | <<locked>> | 80% | 52,866 psi | 81% | 2726 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 35,099 psi | 54% | 2480 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 52,663 psi | 81% | 2776 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,524 psi | 62% | 2552 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,740 psi | 61% | 2539 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,064 psi | 71% | 2612 fps | 100% |
| Hodgdon Retumbo | 74.7 gr | 82% | 33,460 psi | 51% | 2516 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 53,229 psi | 82% | 2805 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,876 psi | 43% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,414 psi | 75% | 2667 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,389 psi | 84% | 2749 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,370 psi | 74% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,032 psi | 65% | 2556 fps | 96.5% |
| IMR 7828 SSC | 72.8 gr | 80% | 36,651 psi | 56% | 2526 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 94% | 37,289 psi | 57% | 2569 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 51,779 psi | 80% | 2700 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,227 psi | 77% | 2694 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,648 psi | 50% | 2365 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 48,878 psi | 75% | 2710 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 30,255 psi | 47% | 2411 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,582 psi | 62% | 2621 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 49,893 psi | 77% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 36,303 psi | 56% | 2533 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 48,820 psi | 75% | 2713 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,430 psi | 50% | 2415 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 44% | 1660 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,314 psi | 79% | 2743 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,879 psi | 77% | 2769 fps | 100% |
| ReloadSwiss RS 76 | 78 gr | 80% | 30,284 psi | 47% | 2425 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 40,118 psi | 62% | 2635 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 43,598 psi | 67% | 2592 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,930 psi | 65% | 2595 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 52,866 psi | 81% | 2726 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,779 psi | 80% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,227 psi | 77% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,691 psi | 78% | 2651 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,597 psi | 64% | 2592 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 44,570 psi | 69% | 2582 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 47,282 psi | 73% | 2667 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,322 psi | 65% | 2572 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 51,213 psi | 79% | 2700 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,738 psi | 57% | 2451 fps | 97.3% |
| Vihtavuori N170 | <<locked>> | 96% | 54,389 psi | 84% | 2779 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 50,560 psi | 78% | 2707 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,220 psi | 63% | 2582 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,509 psi | 62% | 2615 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 38,218 psi | 59% | 2549 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 90% | 41,495 psi | 64% | 2654 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 96% | 48,965 psi | 75% | 2831 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,850 psi | 78% | 2657 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,866 psi | 81% | 2779 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,026 psi | 52% | 2543 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,899 psi | 60% | 2507 fps | 97.4% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 187gr | Peregrine VLR5 (VLR-5). Vihtavuori N570 delivers the highest muzzle velocity at 2,959 fps; across all powders the maximum-charge window runs from 1,808 fps to 2,959 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 187.0 gr projectile in 0.308" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, 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 76, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 187gr | Peregrine VLR5 (VLR-5) 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.