Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:180 gr
Bullet Diameter:0.308"
Bullet Length:<<locked>>
Caliber:.300 Rem. Ultra Mag. load data
Case Length (l3):2.85"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:112.5 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:64,977 psi
Recommended Twist Rate:1:13.0
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Peregrine Bushmaster (VRG-3) bullet and 141 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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 90% | 55,245 psi | 85% | 2812 fps | 100% |
| Accurate 3100 | <<locked>> | 90% | 55,129 psi | 85% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,796 psi | 86% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 55,651 psi | 86% | 2835 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 57,130 psi | 88% | 2959 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 58,508 psi | 90% | 2969 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 90% | 58,421 psi | 90% | 2966 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,174 psi | 88% | 2904 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 57,058 psi | 88% | 2900 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 55,463 psi | 85% | 2913 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 90% | 55,158 psi | 85% | 2907 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 2940 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,551 psi | 89% | 2933 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,141 psi | 80% | 2894 fps | 100% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,866 psi | 80% | 2890 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 57,101 psi | 88% | 2897 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,159 psi | 88% | 2894 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,014 psi | 88% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,768 psi | 87% | 2894 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,449 psi | 87% | 2887 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,709 psi | 86% | 2907 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,405 psi | 85% | 2900 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,145 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,029 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,406 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,305 psi | 88% | 2933 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,247 psi | 90% | 2956 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,885 psi | 89% | 2953 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 2956 fps | 97.5% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,245 psi | 85% | 2953 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,565 psi | 87% | 2871 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,318 psi | 87% | 2867 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 58,755 psi | 90% | 2949 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 58,450 psi | 90% | 2946 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,130 psi | 88% | 2943 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 56,826 psi | 87% | 2940 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 55,709 psi | 86% | 2907 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 55,405 psi | 85% | 2900 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 57,174 psi | 88% | 2838 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,058 psi | 88% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 55,390 psi | 85% | 2904 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 96% | 55,071 psi | 85% | 2897 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 57,464 psi | 88% | 2894 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 57,348 psi | 88% | 2890 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 58,653 psi | 90% | 2904 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 90% | 58,552 psi | 90% | 2904 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,595 psi | 89% | 2890 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,276 psi | 88% | 2884 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,246 psi | 88% | 2815 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,130 psi | 88% | 2815 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,333 psi | 87% | 3018 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,014 psi | 86% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,668 psi | 90% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,552 psi | 90% | 2927 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 57% | 1854 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 58% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,854 psi | 86% | 2828 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 55,753 psi | 86% | 2825 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,537 psi | 90% | 2858 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,347 psi | 87% | 2831 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,985 psi | 86% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,390 psi | 85% | 2831 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,303 psi | 85% | 2831 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 57,479 psi | 88% | 2949 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 92% | 57,377 psi | 88% | 2946 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,355 psi | 73% | 2805 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,282 psi | 73% | 2802 fps | 98.6% |
| Lovex S065 | <<locked>> | 82% | 55,970 psi | 86% | 2805 fps | 100% |
| Lovex S065 | <<locked>> | 82% | 55,854 psi | 86% | 2805 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,986 psi | 89% | 2858 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,856 psi | 89% | 2854 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,898 psi | 88% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,550 psi | 87% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,305 psi | 88% | 2887 fps | 99.9% |
| Norma 204 | <<locked>> | 84% | 57,014 psi | 88% | 2881 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 48,182 psi | 74% | 2831 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 47,892 psi | 74% | 2825 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 55,724 psi | 86% | 2923 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,434 psi | 85% | 2920 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,914 psi | 89% | 2874 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,798 psi | 89% | 2871 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,491 psi | 84% | 2910 fps | 99.6% |
| Ramshot Grand | <<locked>> | 92% | 58,653 psi | 90% | 2966 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,101 psi | 88% | 2881 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 56,797 psi | 87% | 2877 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,232 psi | 88% | 2897 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,116 psi | 88% | 2894 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 59% | 1900 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 59% | 1896 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,188 psi | 86% | 2858 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,086 psi | 86% | 2858 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,810 psi | 84% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 54,650 psi | 84% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,566 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,261 psi | 88% | 3002 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,058 psi | 88% | 2969 fps | 99.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,739 psi | 87% | 2963 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 57,885 psi | 89% | 2874 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 88% | 57,609 psi | 89% | 2867 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 56,202 psi | 86% | 2881 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 88% | 56,101 psi | 86% | 2877 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 57,174 psi | 88% | 2838 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 57,058 psi | 88% | 2835 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,970 psi | 86% | 2805 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,854 psi | 86% | 2805 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,986 psi | 89% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,856 psi | 89% | 2854 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,711 psi | 90% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,610 psi | 90% | 2808 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,825 psi | 86% | 2877 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 55,695 psi | 86% | 2874 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 55,782 psi | 86% | 2808 fps | 99% |
| Somchem S361 | <<locked>> | 86% | 55,506 psi | 85% | 2802 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 55,259 psi | 85% | 2822 fps | 100% |
| Somchem S365 | <<locked>> | 84% | 55,114 psi | 85% | 2822 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,710 psi | 87% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 56,405 psi | 87% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,825 psi | 86% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 55,709 psi | 86% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,521 psi | 87% | 2831 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,449 psi | 87% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 55,100 psi | 85% | 2818 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,740 psi | 90% | 2864 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,216 psi | 85% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,784 psi | 90% | 2894 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,332 psi | 85% | 2923 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 88% | 55,042 psi | 85% | 2917 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 94% | 55,724 psi | 86% | 2904 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 55,622 psi | 86% | 2904 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 98% | 57,348 psi | 88% | 2966 fps | 98.9% |
| Vihtavuori N568 | <<locked>> | 98% | 57,261 psi | 88% | 2966 fps | 98.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,610 psi | 90% | 3028 fps | 97.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,320 psi | 90% | 3022 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,535 psi | 85% | 2766 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,245 psi | 85% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,667 psi | 89% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,551 psi | 89% | 2894 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,942 psi | 88% | 2956 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,565 psi | 87% | 2949 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,782 psi | 87% | 2851 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,463 psi | 87% | 2844 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% | 38,972 psi | 60% | 2539 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 38,856 psi | 60% | 2536 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 51,982 psi | 80% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 51,851 psi | 80% | 2782 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,830 psi | 66% | 2713 fps | 97.2% |
| Accurate MAGPRO | <<locked>> | 80% | 40,596 psi | 62% | 2654 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 80% | 40,335 psi | 62% | 2648 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 43,395 psi | 67% | 2674 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 43,279 psi | 67% | 2674 fps | 98.2% |
| ADI AR 2213 | <<locked>> | 80% | 38,696 psi | 60% | 2605 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 38,566 psi | 59% | 2602 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 88% | 37,724 psi | 58% | 2575 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 37,623 psi | 58% | 2572 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 29,805 psi | 46% | 2415 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 29,718 psi | 46% | 2411 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,627 psi | 67% | 2671 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,879 psi | 77% | 2792 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,748 psi | 77% | 2789 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,337 psi | 67% | 2667 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,221 psi | 67% | 2664 fps | 98.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,160 psi | 60% | 2612 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,059 psi | 60% | 2608 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,768 psi | 58% | 2566 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,652 psi | 58% | 2562 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,619 psi | 50% | 2487 fps | 98.3% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,518 psi | 50% | 2484 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,685 psi | 66% | 2717 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,395 psi | 65% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,427 psi | 73% | 2818 fps | 95.5% |
| Alliant Reloder-33 | <<locked>> | 96% | 47,166 psi | 73% | 2812 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,543 psi | 72% | 2700 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 46,340 psi | 71% | 2694 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 36,419 psi | 56% | 2549 fps | 96.2% |
| Bofors RP15 | <<locked>> | 80% | 36,289 psi | 56% | 2543 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 37,391 psi | 58% | 2589 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 37,144 psi | 57% | 2582 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 39,160 psi | 60% | 2612 fps | 97.3% |
| Bofors RP5 | <<locked>> | 80% | 39,059 psi | 60% | 2608 fps | 97.2% |
| Bofors RP7 | <<locked>> | 80% | 53,693 psi | 83% | 2789 fps | 99.9% |
| Bofors RP7 | <<locked>> | 80% | 53,577 psi | 82% | 2785 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 35,810 psi | 55% | 2533 fps | 95.7% |
| Hodgdon H1000 | <<locked>> | 84% | 35,737 psi | 55% | 2530 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 53,751 psi | 83% | 2841 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 53,417 psi | 82% | 2835 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 41,292 psi | 64% | 2612 fps | 96% |
| Hodgdon H4831 | <<locked>> | 80% | 41,191 psi | 63% | 2608 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,538 psi | 62% | 2595 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 40,437 psi | 62% | 2592 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,804 psi | 72% | 2671 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,673 psi | 72% | 2667 fps | 100% |
| Hodgdon Retumbo | 77.7 gr | 82% | 34,156 psi | 53% | 2572 fps | 96.2% |
| Hodgdon Retumbo | 77.7 gr | 82% | 34,026 psi | 52% | 2569 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 54,404 psi | 84% | 2867 fps | 100% |
| Hodgdon Superformance | <<locked>> | 80% | 54,259 psi | 84% | 2867 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 43% | 1667 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 43% | 1663 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,139 psi | 76% | 2726 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 49,023 psi | 75% | 2723 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,042 psi | 85% | 2808 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,182 psi | 76% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,052 psi | 75% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,670 psi | 66% | 2612 fps | 96.6% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,569 psi | 66% | 2608 fps | 96.5% |
| IMR 7828 SSC | <<locked>> | 80% | 37,318 psi | 57% | 2582 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 80% | 37,217 psi | 57% | 2579 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,592 psi | 55% | 2562 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 92% | 35,491 psi | 55% | 2562 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 52,431 psi | 81% | 2756 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 52,315 psi | 81% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,995 psi | 78% | 2753 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,879 psi | 78% | 2749 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 33,344 psi | 51% | 2418 fps | 97.7% |
| Lovex S071 | <<locked>> | 80% | 33,228 psi | 51% | 2415 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 49,850 psi | 77% | 2769 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 49,545 psi | 76% | 2762 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 31,053 psi | 48% | 2467 fps | 95.4% |
| Norma 217 | <<locked>> | 88% | 30,937 psi | 48% | 2464 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 41,524 psi | 64% | 2684 fps | 99% |
| Norma MRP | <<locked>> | 80% | 41,423 psi | 64% | 2680 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 50,734 psi | 78% | 2772 fps | 100% |
| Norma URP | <<locked>> | 80% | 50,604 psi | 78% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,057 psi | 57% | 2585 fps | 95.6% |
| Ramshot Grand | <<locked>> | 80% | 36,941 psi | 57% | 2582 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 49,806 psi | 77% | 2772 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 49,516 psi | 76% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 33,170 psi | 51% | 2467 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 80% | 33,054 psi | 51% | 2461 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,631 psi | 44% | 1706 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,572 psi | 44% | 1703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,330 psi | 81% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,185 psi | 80% | 2802 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,865 psi | 78% | 2828 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,749 psi | 78% | 2828 fps | 100% |
| ReloadSwiss RS 76 | 81.1 gr | 80% | 30,937 psi | 48% | 2474 fps | 95.9% |
| ReloadSwiss RS 76 | 81.1 gr | 80% | 30,835 psi | 47% | 2470 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,452 psi | 64% | 2697 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 41,191 psi | 63% | 2694 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 44,324 psi | 68% | 2651 fps | 97.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,222 psi | 68% | 2648 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 80% | 42,685 psi | 66% | 2654 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 42,569 psi | 66% | 2651 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 53,693 psi | 83% | 2789 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 80% | 53,577 psi | 82% | 2785 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,431 psi | 81% | 2756 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,315 psi | 81% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,995 psi | 78% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,879 psi | 78% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,547 psi | 79% | 2710 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,271 psi | 79% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,351 psi | 65% | 2648 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,235 psi | 65% | 2644 fps | 98.1% |
| Somchem S361 | <<locked>> | 80% | 45,295 psi | 70% | 2635 fps | 97.1% |
| Somchem S361 | <<locked>> | 80% | 45,194 psi | 70% | 2635 fps | 97.1% |
| Somchem S365 | <<locked>> | 80% | 48,182 psi | 74% | 2723 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 48,022 psi | 74% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,149 psi | 66% | 2631 fps | 98.9% |
| Somchem S385 | <<locked>> | 80% | 43,047 psi | 66% | 2631 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 80% | 52,185 psi | 80% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,069 psi | 80% | 2759 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,521 psi | 58% | 2510 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 80% | 37,420 psi | 58% | 2507 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,430 psi | 79% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 51,300 psi | 79% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,105 psi | 65% | 2641 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,974 psi | 65% | 2638 fps | 100% |
| Vihtavuori N560 | 78.7 gr | 80% | 41,437 psi | 64% | 2674 fps | 96.2% |
| Vihtavuori N560 | 78.7 gr | 80% | 41,321 psi | 64% | 2671 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 39,102 psi | 60% | 2605 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 39,015 psi | 60% | 2602 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 90% | 42,627 psi | 66% | 2713 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 42,511 psi | 65% | 2710 fps | 95.5% |
| Vihtavuori N570 | <<locked>> | 96% | 50,531 psi | 78% | 2897 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 96% | 50,212 psi | 77% | 2890 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,619 psi | 79% | 2713 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,532 psi | 79% | 2710 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,751 psi | 83% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,621 psi | 83% | 2838 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 35,143 psi | 54% | 2602 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,882 psi | 54% | 2595 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,653 psi | 61% | 2559 fps | 97.4% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,537 psi | 61% | 2556 fps | 97.3% |
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 141 powders for .300 Rem. Ultra Mag. loaded with the .308 | 180gr | Peregrine Bushmaster (VRG-3). Vihtavuori N570 delivers the highest muzzle velocity at 3,028 fps; across all powders the maximum-charge window runs from 1,854 fps to 3,028 fps. ADI AR 2217 gives the best case fill at 100 %, and 141 of the 141 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 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2217, 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 | Peregrine Bushmaster (VRG-3) 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.