Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:166 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:1:10.5
Load data in caliber .300 Rem. Ultra Mag. with .308 | 166gr | Peregrine Glider (Glider Tactical) bullet and 151 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Winchester StaBALL HD and ReloadSwiss RS 76.
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>> | 94% | 57,914 psi | 89% | 2936 fps | 100% |
| Accurate 3100 | <<locked>> | 94% | 57,769 psi | 89% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,752 psi | 84% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,465 psi | 90% | 2969 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,028 psi | 86% | 3038 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 57,014 psi | 88% | 3038 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 92% | 56,840 psi | 87% | 3031 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 56,217 psi | 87% | 2982 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 56,043 psi | 86% | 2976 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 94% | 58,233 psi | 90% | 3045 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 57,841 psi | 89% | 3035 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,417 psi | 81% | 2936 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2933 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,934 psi | 72% | 2897 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,630 psi | 72% | 2890 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,144 psi | 86% | 2969 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,521 psi | 87% | 2979 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,101 psi | 86% | 2982 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,898 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,348 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,927 psi | 88% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,811 psi | 86% | 2969 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,463 psi | 85% | 2963 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,247 psi | 90% | 3035 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,899 psi | 89% | 3031 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,738 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,347 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,376 psi | 85% | 3009 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,245 psi | 85% | 3005 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,463 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,057 psi | 86% | 3031 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,043 psi | 86% | 2940 fps | 96.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,782 psi | 86% | 2936 fps | 96.6% |
| Bofors RP15 | <<locked>> | 96% | 57,174 psi | 88% | 3018 fps | 99.7% |
| Bofors RP15 | <<locked>> | 96% | 56,985 psi | 88% | 3015 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,259 psi | 85% | 3009 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 3002 fps | 99.2% |
| Bofors RP5 | <<locked>> | 94% | 58,247 psi | 90% | 3035 fps | 99.8% |
| Bofors RP5 | <<locked>> | 94% | 57,899 psi | 89% | 3031 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 56,971 psi | 88% | 2927 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 56,797 psi | 87% | 2920 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,102 psi | 89% | 3028 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 3025 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 56,652 psi | 87% | 2976 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 56,434 psi | 87% | 2969 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,434 psi | 85% | 2936 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 82% | 55,259 psi | 85% | 2930 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 57,856 psi | 89% | 2979 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,522 psi | 89% | 2972 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,594 psi | 87% | 2959 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,434 psi | 87% | 2956 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,376 psi | 87% | 2900 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,970 psi | 86% | 2897 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,392 psi | 90% | 3143 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,001 psi | 89% | 3136 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,754 psi | 89% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,595 psi | 89% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 57% | 1913 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 57% | 1909 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,303 psi | 85% | 2910 fps | 99.8% |
| IMR 4350 | <<locked>> | 88% | 58,769 psi | 90% | 2956 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,508 psi | 90% | 2949 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,349 psi | 90% | 2946 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,477 psi | 85% | 2913 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 58,798 psi | 90% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,407 psi | 90% | 2959 fps | 98.9% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,276 psi | 90% | 2959 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 94% | 55,999 psi | 86% | 3018 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 55,811 psi | 86% | 3015 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,235 psi | 65% | 2792 fps | 96.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,916 psi | 65% | 2785 fps | 96.4% |
| Lovex S065 | <<locked>> | 84% | 55,477 psi | 85% | 2890 fps | 100% |
| Lovex S065 | <<locked>> | 84% | 55,274 psi | 85% | 2887 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,406 psi | 88% | 2940 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,261 psi | 88% | 2936 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,317 psi | 85% | 2900 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,187 psi | 85% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,681 psi | 87% | 2966 fps | 99.5% |
| Norma 204 | <<locked>> | 86% | 56,318 psi | 87% | 2959 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 42,482 psi | 65% | 2818 fps | 98.7% |
| Norma 217ᴾ | <<locked>> | 100% | 42,134 psi | 65% | 2812 fps | 98.6% |
| Norma MRP | <<locked>> | 92% | 58,363 psi | 90% | 3054 fps | 100% |
| Norma MRP | <<locked>> | 92% | 58,001 psi | 89% | 3051 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,087 psi | 88% | 2959 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,898 psi | 88% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,174 psi | 88% | 3038 fps | 99.4% |
| Ramshot Grand | <<locked>> | 94% | 56,753 psi | 87% | 3035 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,289 psi | 87% | 2966 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 55,927 psi | 86% | 2956 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,666 psi | 86% | 2966 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 96% | 55,288 psi | 85% | 2963 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,855 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 58% | 1952 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,143 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,940 psi | 85% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,827 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,653 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,477 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,114 psi | 85% | 3068 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,752 psi | 84% | 3022 fps | 98.3% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,404 psi | 84% | 3018 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 82% | 58,436 psi | 90% | 2923 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 58,015 psi | 89% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,203 psi | 88% | 2949 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 90% | 56,840 psi | 87% | 2943 fps | 99% |
| Rottweil R 905 | <<locked>> | 90% | 55,143 psi | 85% | 2956 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 90% | 54,955 psi | 85% | 2953 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 56,971 psi | 88% | 2927 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 56,797 psi | 87% | 2920 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,477 psi | 85% | 2890 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,274 psi | 85% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,406 psi | 88% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,261 psi | 88% | 2936 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,899 psi | 89% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,696 psi | 89% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,450 psi | 90% | 2894 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,305 psi | 90% | 2894 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,740 psi | 90% | 3012 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,378 psi | 90% | 3002 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,783 psi | 89% | 2917 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 57,595 psi | 89% | 2910 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,187 psi | 85% | 2881 fps | 98.3% |
| Somchem S361 | <<locked>> | 88% | 54,853 psi | 84% | 2874 fps | 98.2% |
| Somchem S365 | <<locked>> | 88% | 58,059 psi | 89% | 2959 fps | 100% |
| Somchem S365 | <<locked>> | 88% | 57,624 psi | 89% | 2953 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,724 psi | 86% | 2927 fps | 99.8% |
| Somchem S385 | <<locked>> | 90% | 55,376 psi | 85% | 2920 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,680 psi | 86% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 55,303 psi | 85% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,071 psi | 85% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,624 psi | 90% | 2943 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,419 psi | 85% | 2904 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 94% | 55,274 psi | 85% | 2904 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 58,175 psi | 90% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 58,015 psi | 89% | 2949 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,522 psi | 89% | 2976 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,319 psi | 88% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,030 psi | 89% | 3054 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 92% | 57,667 psi | 89% | 3048 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 58,160 psi | 90% | 3028 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 98% | 57,856 psi | 89% | 3022 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,419 psi | 85% | 3025 fps | 97.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,056 psi | 85% | 3022 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,911 psi | 85% | 2848 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,624 psi | 90% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,855 psi | 88% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,637 psi | 87% | 2976 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,711 psi | 90% | 3084 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,305 psi | 90% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,738 psi | 86% | 2920 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,622 psi | 86% | 2920 fps | 99.5% |
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% | 35,273 psi | 54% | 2543 fps | 97.5% |
| Accurate 3100 | <<locked>> | 80% | 35,099 psi | 54% | 2539 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 47,500 psi | 73% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 47,253 psi | 73% | 2802 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 41,800 psi | 64% | 2779 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 86% | 45,832 psi | 71% | 2844 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 86% | 45,498 psi | 70% | 2838 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 39,624 psi | 61% | 2680 fps | 96.3% |
| ADI AR 2209 | <<locked>> | 80% | 39,450 psi | 61% | 2677 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 84% | 40,814 psi | 63% | 2730 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 84% | 40,509 psi | 62% | 2723 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 39,552 psi | 61% | 2690 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 39,262 psi | 60% | 2684 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 90% | 33,156 psi | 51% | 2582 fps | 96% |
| ADI AR 2225 | <<locked>> | 90% | 33,025 psi | 51% | 2579 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,856 psi | 61% | 2677 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,030 psi | 62% | 2680 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,658 psi | 70% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,440 psi | 70% | 2815 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,185 psi | 82% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,968 psi | 82% | 2930 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,668 psi | 61% | 2674 fps | 96.3% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,494 psi | 61% | 2671 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,159 psi | 59% | 2671 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,000 psi | 58% | 2667 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,055 psi | 52% | 2575 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,866 psi | 52% | 2569 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,501 psi | 45% | 2477 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,341 psi | 45% | 2470 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,971 psi | 58% | 2717 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,623 psi | 58% | 2710 fps | 99.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,475 psi | 81% | 2881 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,199 psi | 80% | 2874 fps | 95.7% |
| Bofors RP15 | <<locked>> | 84% | 37,942 psi | 58% | 2667 fps | 95.7% |
| Bofors RP15 | <<locked>> | 84% | 37,782 psi | 58% | 2661 fps | 95.6% |
| Bofors RP30 | <<locked>> | 90% | 38,653 psi | 59% | 2700 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 38,334 psi | 59% | 2694 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 38,159 psi | 59% | 2671 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 38,000 psi | 58% | 2667 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 50,053 psi | 77% | 2815 fps | 99.3% |
| Bofors RP7 | <<locked>> | 80% | 49,879 psi | 77% | 2812 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 88% | 37,652 psi | 58% | 2651 fps | 95.2% |
| Hodgdon H1000 | <<locked>> | 88% | 37,507 psi | 58% | 2644 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 49,501 psi | 76% | 2864 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 49,110 psi | 76% | 2854 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 51,779 psi | 80% | 2877 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 51,605 psi | 79% | 2871 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 43,656 psi | 67% | 2736 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 84% | 43,337 psi | 67% | 2733 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,830 psi | 66% | 2720 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,511 psi | 65% | 2713 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,873 psi | 66% | 2697 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,670 psi | 66% | 2694 fps | 100% |
| Hodgdon Retumbo | 79.4 gr | 86% | 35,520 psi | 55% | 2684 fps | 95.6% |
| Hodgdon Retumbo | 79.4 gr | 86% | 35,360 psi | 54% | 2677 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 49,719 psi | 77% | 2884 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 80% | 49,356 psi | 76% | 2881 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 42% | 1716 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 42% | 1713 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,440 psi | 70% | 2743 fps | 98.7% |
| IMR 4350 | <<locked>> | 80% | 45,281 psi | 70% | 2740 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,590 psi | 79% | 2844 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,372 psi | 79% | 2838 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,252 psi | 70% | 2756 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,904 psi | 69% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,221 psi | 65% | 2680 fps | 95.4% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,076 psi | 65% | 2677 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 86% | 42,076 psi | 65% | 2769 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 86% | 41,887 psi | 64% | 2762 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,349 psi | 61% | 2730 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,030 psi | 60% | 2723 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 48,805 psi | 75% | 2789 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 48,631 psi | 75% | 2785 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,166 psi | 73% | 2776 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 46,992 psi | 72% | 2772 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 30,124 psi | 46% | 2415 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 29,950 psi | 46% | 2408 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 45,730 psi | 70% | 2782 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 45,556 psi | 70% | 2779 fps | 97.8% |
| Norma 217 | <<locked>> | 94% | 34,142 psi | 53% | 2628 fps | 95.8% |
| Norma 217 | <<locked>> | 94% | 33,982 psi | 52% | 2625 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 37,304 psi | 57% | 2677 fps | 97.1% |
| Norma MRP | <<locked>> | 80% | 37,115 psi | 57% | 2674 fps | 97% |
| Norma URP | <<locked>> | 80% | 46,586 psi | 72% | 2799 fps | 100% |
| Norma URP | <<locked>> | 80% | 46,383 psi | 71% | 2792 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,899 psi | 60% | 2707 fps | 95.2% |
| Ramshot Grand | <<locked>> | 84% | 38,754 psi | 60% | 2703 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 45,585 psi | 70% | 2789 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 80% | 45,426 psi | 70% | 2789 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 34,722 psi | 53% | 2582 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 84% | 34,563 psi | 53% | 2579 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,892 psi | 74% | 2828 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,500 psi | 73% | 2822 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,122 psi | 71% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,934 psi | 71% | 2844 fps | 100% |
| ReloadSwiss RS 76 | 83 gr | 84% | 32,372 psi | 50% | 2589 fps | 95.4% |
| ReloadSwiss RS 76 | 83 gr | 84% | 32,271 psi | 50% | 2585 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,946 psi | 66% | 2812 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,627 psi | 66% | 2805 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 54,491 psi | 84% | 2871 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 54,273 psi | 84% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,959 psi | 63% | 2664 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 40,799 psi | 63% | 2657 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 39,015 psi | 60% | 2661 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 80% | 38,827 psi | 60% | 2657 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 80% | 50,053 psi | 77% | 2815 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 80% | 49,879 psi | 77% | 2812 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,805 psi | 75% | 2789 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,631 psi | 75% | 2785 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,166 psi | 73% | 2776 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 46,992 psi | 72% | 2772 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,230 psi | 83% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,041 psi | 83% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,906 psi | 74% | 2736 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,718 psi | 73% | 2733 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,682 psi | 60% | 2657 fps | 96.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,508 psi | 59% | 2651 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 54,172 psi | 83% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 53,969 psi | 83% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,756 psi | 64% | 2644 fps | 95% |
| Somchem S361 | <<locked>> | 82% | 44,701 psi | 69% | 2700 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 43,700 psi | 67% | 2749 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 43,482 psi | 67% | 2746 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,465 psi | 61% | 2641 fps | 97.3% |
| Somchem S385 | <<locked>> | 80% | 39,291 psi | 60% | 2635 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 51,967 psi | 80% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 51,764 psi | 80% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,066 psi | 74% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,877 psi | 74% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,156 psi | 53% | 2510 fps | 95% |
| Vihtavuori N165 | <<locked>> | 82% | 36,579 psi | 56% | 2566 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 47,442 psi | 73% | 2792 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 47,239 psi | 73% | 2789 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,174 psi | 59% | 2654 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 37,985 psi | 58% | 2648 fps | 99.6% |
| Vihtavuori N560 | <<locked>> | 84% | 43,439 psi | 67% | 2799 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 84% | 43,279 psi | 67% | 2795 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 88% | 40,698 psi | 63% | 2720 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 40,553 psi | 62% | 2717 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 44,193 psi | 68% | 2828 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 47,253 psi | 73% | 2890 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,529 psi | 73% | 2743 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,355 psi | 73% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,501 psi | 76% | 2864 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 49,298 psi | 76% | 2858 fps | 99.5% |
| Winchester StaBALL HD | 75.8 gr | 80% | 30,342 psi | 47% | 2585 fps | 99.8% |
| Winchester StaBALL HD | 75.8 gr | 80% | 30,124 psi | 46% | 2582 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,158 psi | 56% | 2562 fps | 95.1% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,998 psi | 55% | 2559 fps | 95.1% |
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 151 powders for .300 Rem. Ultra Mag. loaded with the .308 | 166gr | Peregrine Glider (Glider Tactical). Hodgdon Retumbo delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,143 fps. ADI AR 2217 gives the best case fill at 100 %, and 151 of the 151 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 166.0 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 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 166gr | Peregrine Glider (Glider Tactical) 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.