Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:146 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:1:11.0
Load data in caliber .300 Rem. Ultra Mag. with .308 | 146gr | Peregrine Glider (Glider GRM) bullet and 159 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD 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.
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>> | 96% | 57,537 psi | 89% | 3074 fps | 100% |
| Accurate 3100 | <<locked>> | 96% | 57,537 psi | 89% | 3074 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 58,494 psi | 90% | 3123 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 58,494 psi | 90% | 3123 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 55,376 psi | 85% | 3166 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 94% | 56,666 psi | 87% | 3166 fps | 97.3% |
| Accurate MAGPRO | <<locked>> | 94% | 56,666 psi | 87% | 3166 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 55,767 psi | 86% | 3045 fps | 100% |
| ADI AR 2208 | <<locked>> | 82% | 55,767 psi | 86% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,985 psi | 86% | 3120 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 92% | 55,985 psi | 86% | 3120 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 57,928 psi | 89% | 3179 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 96% | 57,928 psi | 89% | 3179 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,298 psi | 74% | 2992 fps | 96.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,298 psi | 74% | 2992 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,105 psi | 66% | 2943 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,105 psi | 66% | 2943 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,260 psi | 87% | 3117 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,260 psi | 87% | 3117 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,029 psi | 88% | 3064 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,029 psi | 88% | 3064 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,709 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,709 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,985 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,985 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,550 psi | 85% | 3107 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,550 psi | 85% | 3107 fps | 98.9% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,740 psi | 89% | 3173 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 57,740 psi | 89% | 3173 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,984 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,984 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,476 psi | 84% | 3140 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,476 psi | 84% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,579 psi | 86% | 3173 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,579 psi | 86% | 3173 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,666 psi | 87% | 3153 fps | 99.1% |
| Bofors RP15 | <<locked>> | 98% | 56,666 psi | 87% | 3153 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 58,015 psi | 89% | 3077 fps | 100% |
| Bofors RP3 | <<locked>> | 82% | 58,015 psi | 89% | 3077 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,357 psi | 78% | 3064 fps | 97.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,357 psi | 78% | 3064 fps | 97.6% |
| Bofors RP5 | <<locked>> | 96% | 57,740 psi | 89% | 3173 fps | 99.3% |
| Bofors RP5 | <<locked>> | 96% | 57,740 psi | 89% | 3173 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 57,217 psi | 88% | 3074 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 57,217 psi | 88% | 3074 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,650 psi | 83% | 3091 fps | 98.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,650 psi | 83% | 3091 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 82% | 58,305 psi | 90% | 3100 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 58,305 psi | 90% | 3100 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 56,521 psi | 87% | 3120 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 86% | 56,521 psi | 87% | 3120 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 55,434 psi | 85% | 3081 fps | 99% |
| Hodgdon H4350 | <<locked>> | 84% | 55,434 psi | 85% | 3081 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 57,798 psi | 89% | 3117 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 94% | 57,798 psi | 89% | 3117 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,507 psi | 87% | 3097 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,507 psi | 87% | 3097 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,869 psi | 86% | 3048 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,869 psi | 86% | 3048 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,490 psi | 82% | 3205 fps | 99.5% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,490 psi | 82% | 3205 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 57,798 psi | 89% | 3156 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 57,798 psi | 89% | 3156 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 2024 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 2024 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 58,682 psi | 90% | 3081 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 58,682 psi | 90% | 3081 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,463 psi | 85% | 3051 fps | 99.4% |
| IMR 4350 | <<locked>> | 88% | 55,463 psi | 85% | 3051 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,085 psi | 85% | 3045 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,085 psi | 85% | 3045 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 55,129 psi | 85% | 3058 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 55,129 psi | 85% | 3058 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 58,624 psi | 90% | 3100 fps | 98.1% |
| IMR 4955 Enduron | <<locked>> | 94% | 58,624 psi | 90% | 3100 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 55,477 psi | 85% | 3150 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 55,477 psi | 85% | 3150 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 55,622 psi | 86% | 3041 fps | 100% |
| Lovex S065 | <<locked>> | 86% | 55,622 psi | 86% | 3041 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,377 psi | 88% | 3084 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 57,377 psi | 88% | 3084 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,781 psi | 84% | 3035 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,781 psi | 84% | 3035 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,623 psi | 87% | 3107 fps | 98.8% |
| Norma 204 | <<locked>> | 88% | 56,623 psi | 87% | 3107 fps | 98.8% |
| Norma 217ᴾ | <<locked>> | 100% | 38,305 psi | 59% | 2851 fps | 96.2% |
| Norma 217ᴾ | <<locked>> | 100% | 38,305 psi | 59% | 2851 fps | 96.2% |
| Norma MRP | <<locked>> | 94% | 57,870 psi | 89% | 3196 fps | 99.9% |
| Norma MRP | <<locked>> | 94% | 57,870 psi | 89% | 3196 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 56,840 psi | 87% | 3107 fps | 100% |
| Norma URP | <<locked>> | 88% | 56,840 psi | 87% | 3107 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,304 psi | 87% | 3166 fps | 98.6% |
| Ramshot Grand | <<locked>> | 96% | 56,304 psi | 87% | 3166 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 55,999 psi | 86% | 3104 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 88% | 55,999 psi | 86% | 3104 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 55,129 psi | 85% | 3097 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 98% | 55,129 psi | 85% | 3097 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 57% | 2070 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 57% | 2070 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 58,059 psi | 89% | 3084 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 58,059 psi | 89% | 3084 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,536 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 56,536 psi | 87% | 3136 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,882 psi | 84% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,882 psi | 84% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,595 psi | 89% | 3176 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 57,595 psi | 89% | 3176 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,824 psi | 84% | 3202 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,824 psi | 84% | 3202 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 58,262 psi | 90% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 58,262 psi | 90% | 3077 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,043 psi | 88% | 3084 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 92% | 57,043 psi | 88% | 3084 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 54,810 psi | 84% | 3091 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 92% | 54,810 psi | 84% | 3091 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 57,217 psi | 88% | 3074 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 57,217 psi | 88% | 3074 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,622 psi | 86% | 3041 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,622 psi | 86% | 3041 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,377 psi | 88% | 3084 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 88% | 57,377 psi | 88% | 3084 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,420 psi | 87% | 3081 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,420 psi | 87% | 3081 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,204 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,204 psi | 90% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,984 psi | 85% | 2989 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,984 psi | 85% | 2989 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 58,363 psi | 90% | 3146 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 58,363 psi | 90% | 3146 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 57,972 psi | 89% | 3071 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 57,972 psi | 89% | 3071 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,361 psi | 85% | 3012 fps | 97.3% |
| Somchem S361 | <<locked>> | 90% | 55,361 psi | 85% | 3012 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 57,348 psi | 88% | 3107 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 57,348 psi | 88% | 3107 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,390 psi | 85% | 3061 fps | 99.4% |
| Somchem S385 | <<locked>> | 92% | 55,390 psi | 85% | 3061 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 55,695 psi | 86% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 55,695 psi | 86% | 2989 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,911 psi | 85% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,911 psi | 85% | 3045 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,158 psi | 85% | 3038 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 96% | 55,158 psi | 85% | 3038 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 58,073 psi | 89% | 3100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 58,073 psi | 89% | 3100 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,855 psi | 88% | 3117 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,855 psi | 88% | 3117 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,609 psi | 89% | 3189 fps | 98% |
| Vihtavuori N560 | <<locked>> | 94% | 57,609 psi | 89% | 3189 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,464 psi | 88% | 3156 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,464 psi | 88% | 3156 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,085 psi | 85% | 2999 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,085 psi | 85% | 2999 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,724 psi | 87% | 3123 fps | 99.7% |
| Winchester 760 | <<locked>> | 86% | 56,724 psi | 87% | 3123 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,174 psi | 88% | 3222 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,174 psi | 88% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,593 psi | 86% | 3054 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,593 psi | 86% | 3054 fps | 98.9% |
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% | 32,300 psi | 50% | 2592 fps | 95% |
| Accurate 3100 | <<locked>> | 80% | 32,300 psi | 50% | 2592 fps | 95% |
| Accurate 4350 | <<locked>> | 80% | 43,801 psi | 67% | 2884 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 43,801 psi | 67% | 2884 fps | 99.6% |
| Accurate High Country | <<locked>> | 86% | 44,266 psi | 68% | 2959 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 90% | 48,733 psi | 75% | 3031 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 90% | 48,733 psi | 75% | 3031 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 52,156 psi | 80% | 2989 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 52,156 psi | 80% | 2989 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 42,380 psi | 65% | 2871 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 84% | 42,380 psi | 65% | 2871 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 90% | 46,673 psi | 72% | 2982 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 90% | 46,673 psi | 72% | 2982 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 45,078 psi | 69% | 2927 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 45,078 psi | 69% | 2927 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 34,983 psi | 54% | 2740 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 34,983 psi | 54% | 2740 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 42,728 psi | 66% | 2871 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 42,728 psi | 66% | 2871 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,301 psi | 82% | 3012 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,301 psi | 82% | 3012 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,206 psi | 65% | 2897 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,206 psi | 65% | 2897 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,182 psi | 76% | 3025 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,182 psi | 76% | 3025 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,279 psi | 65% | 2861 fps | 95.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,279 psi | 65% | 2861 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,422 psi | 62% | 2851 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,422 psi | 62% | 2851 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,154 psi | 48% | 2631 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,154 psi | 48% | 2631 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,256 psi | 48% | 2641 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,256 psi | 48% | 2641 fps | 95.2% |
| Alliant Reloder-26 | 80.4 gr | 80% | 34,229 psi | 53% | 2759 fps | 97.4% |
| Alliant Reloder-26 | 80.4 gr | 80% | 34,229 psi | 53% | 2759 fps | 97.4% |
| Bofors RP15 | <<locked>> | 88% | 40,001 psi | 62% | 2841 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 40,001 psi | 62% | 2841 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 54,114 psi | 83% | 3022 fps | 100% |
| Bofors RP3 | <<locked>> | 80% | 54,114 psi | 83% | 3022 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 43,613 psi | 67% | 2936 fps | 95.8% |
| Bofors RP30 | <<locked>> | 96% | 43,613 psi | 67% | 2936 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 40,422 psi | 62% | 2851 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 40,422 psi | 62% | 2851 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 47,007 psi | 72% | 2900 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 47,007 psi | 72% | 2900 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 43,105 psi | 66% | 2894 fps | 95.8% |
| Hodgdon H1000 | <<locked>> | 94% | 43,105 psi | 66% | 2894 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 54,476 psi | 84% | 3045 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 54,476 psi | 84% | 3045 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,905 psi | 71% | 2936 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 80% | 45,905 psi | 71% | 2936 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 48,414 psi | 75% | 2956 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 48,414 psi | 75% | 2956 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 88% | 46,702 psi | 72% | 2927 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 88% | 46,702 psi | 72% | 2927 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,023 psi | 75% | 2969 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 49,023 psi | 75% | 2969 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,668 psi | 61% | 2776 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,668 psi | 61% | 2776 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 40,190 psi | 62% | 2923 fps | 96.1% |
| Hodgdon Retumbo | <<locked>> | 92% | 40,190 psi | 62% | 2923 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 45,788 psi | 70% | 2953 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 80% | 45,788 psi | 70% | 2953 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1821 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1821 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,868 psi | 84% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,868 psi | 84% | 3025 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,467 psi | 65% | 2822 fps | 97% |
| IMR 4350 | <<locked>> | 80% | 42,467 psi | 65% | 2822 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,370 psi | 74% | 2927 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,370 psi | 74% | 2927 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 41,800 psi | 64% | 2828 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 41,800 psi | 64% | 2828 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 48,138 psi | 74% | 2923 fps | 95.8% |
| IMR 4955 Enduron | <<locked>> | 88% | 48,138 psi | 74% | 2923 fps | 95.8% |
| IMR 7828 SSC | 84.6 gr | 90% | 44,802 psi | 69% | 2953 fps | 95.4% |
| IMR 7828 SSC | 84.6 gr | 90% | 44,802 psi | 69% | 2953 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 45,788 psi | 70% | 2874 fps | 99.1% |
| Lovex S065 | <<locked>> | 80% | 45,788 psi | 70% | 2874 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 44,092 psi | 68% | 2858 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 44,092 psi | 68% | 2858 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 33,982 psi | 52% | 2635 fps | 95.8% |
| Lovex S071 | <<locked>> | 86% | 33,982 psi | 52% | 2635 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 42,583 psi | 66% | 2851 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 42,583 psi | 66% | 2851 fps | 95.7% |
| Norma 217 | <<locked>> | 98% | 35,694 psi | 55% | 2785 fps | 95% |
| Norma 217 | <<locked>> | 98% | 35,694 psi | 55% | 2785 fps | 95% |
| Norma MRP | <<locked>> | 82% | 36,724 psi | 57% | 2795 fps | 95.6% |
| Norma MRP | <<locked>> | 82% | 36,724 psi | 57% | 2795 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 43,221 psi | 67% | 2877 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 43,221 psi | 67% | 2877 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 44,744 psi | 69% | 2959 fps | 95.8% |
| Ramshot Grand | <<locked>> | 90% | 44,744 psi | 69% | 2959 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 42,351 psi | 65% | 2864 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 42,351 psi | 65% | 2864 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 88% | 37,086 psi | 57% | 2756 fps | 95.2% |
| Ramshot Magnum | <<locked>> | 88% | 37,086 psi | 57% | 2756 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 43% | 1864 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 43% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,128 psi | 83% | 3022 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,128 psi | 83% | 3022 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,315 psi | 81% | 3077 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,315 psi | 81% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,092 psi | 68% | 2904 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,092 psi | 68% | 2904 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,525 psi | 65% | 2917 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,525 psi | 65% | 2917 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 37,217 psi | 57% | 2835 fps | 96.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 37,217 psi | 57% | 2835 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 50,879 psi | 78% | 2969 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 50,879 psi | 78% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,758 psi | 67% | 2851 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 84% | 43,758 psi | 67% | 2851 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 41,452 psi | 64% | 2841 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 84% | 41,452 psi | 64% | 2841 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 47,007 psi | 72% | 2900 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 47,007 psi | 72% | 2900 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,788 psi | 70% | 2874 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,788 psi | 70% | 2874 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 80% | 44,092 psi | 68% | 2858 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 80% | 44,092 psi | 68% | 2858 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,736 psi | 81% | 3025 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,736 psi | 81% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,271 psi | 79% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,271 psi | 79% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,918 psi | 69% | 2815 fps | 98.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,918 psi | 69% | 2815 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,089 psi | 63% | 2838 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,089 psi | 63% | 2838 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 50,821 psi | 78% | 2966 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 50,821 psi | 78% | 2966 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 48,138 psi | 74% | 2894 fps | 95.6% |
| Somchem S361 | <<locked>> | 86% | 48,138 psi | 74% | 2894 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 40,059 psi | 62% | 2828 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 40,059 psi | 62% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 39,131 psi | 60% | 2759 fps | 95.9% |
| Somchem S385 | <<locked>> | 82% | 39,131 psi | 60% | 2759 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 48,689 psi | 75% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 48,689 psi | 75% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,686 psi | 69% | 2871 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 44,686 psi | 69% | 2871 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 38,885 psi | 60% | 2740 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,885 psi | 60% | 2740 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 44,251 psi | 68% | 2874 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 80% | 44,251 psi | 68% | 2874 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 34,940 psi | 54% | 2713 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 34,940 psi | 54% | 2713 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 88% | 46,195 psi | 71% | 2986 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 88% | 46,195 psi | 71% | 2986 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 46,224 psi | 71% | 2959 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 94% | 46,224 psi | 71% | 2959 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,164 psi | 68% | 2831 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,164 psi | 68% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,079 psi | 71% | 2943 fps | 98.4% |
| Winchester 760 | <<locked>> | 80% | 46,079 psi | 71% | 2943 fps | 98.4% |
| Winchester StaBALL HD | 77.3 gr | 80% | 27,673 psi | 43% | 2615 fps | 97.9% |
| Winchester StaBALL HD | 77.3 gr | 80% | 27,673 psi | 43% | 2615 fps | 97.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,611 psi | 64% | 2805 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,611 psi | 64% | 2805 fps | 95.7% |
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 159 powders for .300 Rem. Ultra Mag. loaded with the .308 | 146gr | Peregrine Glider (Glider GRM). Winchester StaBALL HD delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 2,024 fps to 3,222 fps. ADI AR 2217 gives the best case fill at 100 %, and 159 of the 159 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 146.0 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 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. Alliant Reloder-26, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 146gr | Peregrine Glider (Glider GRM) 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.