Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Peregrine Glider (Glider GRM) bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Norma MRP.
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>> | 96% | 58,465 psi | 90% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,347 psi | 85% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,392 psi | 88% | 3153 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 56,289 psi | 87% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,768 psi | 87% | 3100 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 58,581 psi | 90% | 3159 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,081 psi | 76% | 2979 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2933 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 56,811 psi | 87% | 3094 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,624 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,449 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 57,783 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,115 psi | 86% | 3084 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,407 psi | 90% | 3153 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,637 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,405 psi | 85% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,608 psi | 87% | 3156 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,319 psi | 88% | 3133 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,285 psi | 79% | 3051 fps | 98% |
| Bofors RP5 | <<locked>> | 96% | 58,407 psi | 90% | 3153 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 57,812 psi | 89% | 3051 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,331 psi | 84% | 3077 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 57,246 psi | 88% | 3100 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,086 psi | 86% | 3058 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 58,392 psi | 90% | 3097 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,334 psi | 88% | 3081 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,811 psi | 87% | 3028 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,230 psi | 83% | 3189 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 58,697 psi | 90% | 3136 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 2001 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,101 psi | 86% | 3035 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,825 psi | 86% | 3025 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,840 psi | 86% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,535 psi | 85% | 3025 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 96% | 56,391 psi | 87% | 3133 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 56,202 psi | 86% | 3018 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,044 psi | 89% | 3064 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,419 psi | 85% | 3015 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,363 psi | 88% | 3087 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 39,059 psi | 60% | 2844 fps | 96.8% |
| Norma MRP | <<locked>> | 94% | 58,595 psi | 90% | 3176 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 57,566 psi | 89% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,348 psi | 88% | 3153 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,753 psi | 87% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,956 psi | 86% | 3081 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 58,668 psi | 90% | 3061 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,363 psi | 88% | 3110 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,666 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,523 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,415 psi | 78% | 3058 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 55,201 psi | 85% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,754 psi | 89% | 3071 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 55,593 psi | 86% | 3074 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 57,812 psi | 89% | 3051 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,202 psi | 86% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,044 psi | 89% | 3064 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,072 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 58,697 psi | 90% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,622 psi | 86% | 2969 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,158 psi | 85% | 3068 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 58,610 psi | 90% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,883 psi | 86% | 2995 fps | 97.6% |
| Somchem S365 | <<locked>> | 90% | 58,189 psi | 90% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,173 psi | 86% | 3045 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,304 psi | 87% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,767 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,999 psi | 86% | 3025 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 54,984 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,725 psi | 89% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,305 psi | 90% | 3169 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,276 psi | 90% | 3140 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,811 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,450 psi | 88% | 3104 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 58,175 psi | 90% | 3205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,420 psi | 87% | 3038 fps | 99.1% |
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% | 32,909 psi | 51% | 2582 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 44,585 psi | 69% | 2871 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 49,574 psi | 76% | 3018 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,808 psi | 81% | 2969 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,943 psi | 61% | 2789 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 44,077 psi | 68% | 2900 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 96% | 42,569 psi | 66% | 2851 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 35,534 psi | 55% | 2733 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 40,335 psi | 62% | 2789 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,027 psi | 83% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,728 psi | 66% | 2881 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,864 psi | 77% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,914 psi | 61% | 2785 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,031 psi | 63% | 2841 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,720 psi | 49% | 2621 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,720 psi | 49% | 2635 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,969 psi | 54% | 2753 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 40,611 psi | 63% | 2825 fps | 95.6% |
| Bofors RP30 | <<locked>> | 94% | 41,234 psi | 63% | 2858 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 41,031 psi | 63% | 2841 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 47,471 psi | 73% | 2881 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 92% | 40,712 psi | 63% | 2815 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 46,514 psi | 72% | 2920 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 49,110 psi | 76% | 2943 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 47,181 psi | 73% | 2907 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,296 psi | 71% | 2890 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,161 psi | 62% | 2756 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,043 psi | 59% | 2844 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 46,485 psi | 72% | 2940 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 42% | 1798 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,091 psi | 66% | 2805 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,023 psi | 75% | 2910 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 42,467 psi | 65% | 2815 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,527 psi | 70% | 2848 fps | 95.3% |
| IMR 7828 SSC | 84.1 gr | 90% | 45,310 psi | 70% | 2936 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 46,427 psi | 71% | 2858 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,715 psi | 69% | 2838 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 32,140 psi | 49% | 2562 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 43,134 psi | 66% | 2835 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 36,245 psi | 56% | 2776 fps | 95.6% |
| Norma MRP | 79.7 gr | 82% | 37,463 psi | 58% | 2785 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 43,918 psi | 68% | 2861 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,192 psi | 65% | 2877 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 42,888 psi | 66% | 2848 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 37,710 psi | 58% | 2746 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 43% | 1841 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 54,911 psi | 85% | 3005 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,084 psi | 82% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,701 psi | 69% | 2884 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,134 psi | 66% | 2900 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,099 psi | 54% | 2753 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,528 psi | 72% | 2982 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 51,634 psi | 79% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,266 psi | 68% | 2835 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 39,204 psi | 60% | 2769 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 47,471 psi | 73% | 2881 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,427 psi | 71% | 2858 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,715 psi | 69% | 2838 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,330 psi | 82% | 3005 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,735 psi | 80% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,382 psi | 70% | 2795 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,870 psi | 60% | 2762 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 51,532 psi | 79% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,455 psi | 70% | 2815 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 40,799 psi | 63% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,057 psi | 57% | 2687 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 49,385 psi | 76% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,382 psi | 70% | 2858 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,840 psi | 57% | 2671 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 44,817 psi | 69% | 2854 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 35,447 psi | 55% | 2697 fps | 98.5% |
| Vihtavuori N560 | <<locked>> | 88% | 46,934 psi | 72% | 2972 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 43,772 psi | 67% | 2884 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,744 psi | 69% | 2812 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,688 psi | 72% | 2923 fps | 98.6% |
| Winchester StaBALL HD | 76.9 gr | 80% | 28,094 psi | 43% | 2608 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,233 psi | 60% | 2730 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Peregrine Glider (Glider GRM). Winchester StaBALL HD delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 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 2225, Alliant Reloder-25 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. Winchester StaBALL HD, IMR 7828 SSC, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | 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.