Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Frontier PH HPFB bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand and Alliant Reloder-26.
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>> | 94% | 57,421 psi | 88% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,160 psi | 90% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,231 psi | 87% | 3130 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 58,276 psi | 90% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,274 psi | 85% | 3077 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 57,058 psi | 88% | 3136 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,459 psi | 79% | 3022 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,238 psi | 71% | 2982 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,593 psi | 86% | 3074 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,969 psi | 85% | 3084 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,347 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,668 psi | 90% | 3123 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,188 psi | 88% | 3130 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,566 psi | 90% | 3104 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,448 psi | 85% | 3133 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,347 psi | 87% | 3114 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,346 psi | 84% | 3097 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 57,188 psi | 88% | 3130 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,318 psi | 87% | 3028 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,014 psi | 88% | 3117 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 55,970 psi | 86% | 3077 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 58,262 psi | 90% | 3091 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,913 psi | 88% | 3071 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,709 psi | 86% | 3051 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,579 psi | 86% | 3005 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,203 psi | 88% | 3235 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,956 psi | 88% | 3110 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 57% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,204 psi | 90% | 3064 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,696 psi | 89% | 3051 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 58,320 psi | 90% | 3068 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,653 psi | 89% | 3054 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 55,042 psi | 85% | 3110 fps | 98.3% |
| Lovex S065 | <<locked>> | 86% | 58,508 psi | 90% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,811 psi | 87% | 3041 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,537 psi | 90% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,637 psi | 86% | 3061 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 41,771 psi | 64% | 2900 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 57,421 psi | 88% | 3156 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,333 psi | 87% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,956 psi | 86% | 3130 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 86% | 55,288 psi | 85% | 3061 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,578 psi | 84% | 3058 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 58% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,421 psi | 90% | 3100 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,840 psi | 87% | 3127 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,578 psi | 84% | 3166 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,664 psi | 83% | 3104 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 57,653 psi | 89% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,391 psi | 87% | 3045 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 58,131 psi | 89% | 3110 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 56,318 psi | 87% | 3028 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,508 psi | 90% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,811 psi | 87% | 3041 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,043 psi | 88% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,001 psi | 89% | 3002 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,682 psi | 89% | 3107 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 57,261 psi | 88% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,421 psi | 90% | 3031 fps | 98.2% |
| Somchem S365 | <<locked>> | 88% | 57,043 psi | 88% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,726 psi | 90% | 3077 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 58,653 psi | 90% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,131 psi | 89% | 3054 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,581 psi | 90% | 3058 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 57,508 psi | 89% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,884 psi | 88% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,043 psi | 88% | 3146 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 98% | 57,334 psi | 88% | 3123 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,360 psi | 84% | 3114 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,117 psi | 89% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,970 psi | 86% | 3077 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,116 psi | 88% | 3182 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,071 psi | 85% | 3015 fps | 99% |
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% | 2635 fps | 96.7% |
| Accurate 4350 | <<locked>> | 80% | 47,152 psi | 73% | 2910 fps | 99.9% |
| Accurate MAGPRO | 88.8 gr | 88% | 48,501 psi | 75% | 2992 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 54,621 psi | 84% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,218 psi | 60% | 2769 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 86% | 43,221 psi | 67% | 2877 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,843 psi | 64% | 2831 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 92% | 35,302 psi | 54% | 2723 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,639 psi | 61% | 2772 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,904 psi | 69% | 2917 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,388 psi | 81% | 3038 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,276 psi | 60% | 2766 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,408 psi | 62% | 2822 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,692 psi | 52% | 2664 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,502 psi | 48% | 2621 fps | 95.8% |
| Alliant Reloder-26 | 81.7 gr | 80% | 37,405 psi | 58% | 2802 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 40,147 psi | 62% | 2812 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 40,930 psi | 63% | 2844 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 40,408 psi | 62% | 2822 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 49,530 psi | 76% | 2917 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 39,943 psi | 61% | 2795 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 48,805 psi | 75% | 2959 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 51,126 psi | 79% | 2976 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 46,166 psi | 71% | 2884 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,310 psi | 70% | 2871 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,395 psi | 65% | 2795 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,623 psi | 58% | 2828 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,762 psi | 75% | 2976 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,020 psi | 69% | 2841 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,879 psi | 78% | 2943 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 44,744 psi | 69% | 2851 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,469 psi | 68% | 2822 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 44,440 psi | 68% | 2913 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,370 psi | 74% | 2887 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 46,862 psi | 72% | 2877 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 32,227 psi | 50% | 2559 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 45,281 psi | 70% | 2874 fps | 96.9% |
| Norma 217 | <<locked>> | 96% | 36,303 psi | 56% | 2772 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,927 psi | 57% | 2766 fps | 96% |
| Norma URP | <<locked>> | 80% | 46,137 psi | 71% | 2897 fps | 99.8% |
| Ramshot Grand | 84.5 gr | 86% | 41,336 psi | 64% | 2858 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 45,150 psi | 69% | 2887 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 37,101 psi | 57% | 2726 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 43% | 1847 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,195 psi | 73% | 2927 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,411 psi | 70% | 2940 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,664 psi | 53% | 2736 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,774 psi | 70% | 2966 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 54,143 psi | 83% | 2982 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,337 psi | 67% | 2812 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 38,537 psi | 59% | 2746 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 49,530 psi | 76% | 2917 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,370 psi | 74% | 2887 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 46,862 psi | 72% | 2877 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,751 psi | 83% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,427 psi | 73% | 2831 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,203 psi | 59% | 2743 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,650 psi | 83% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 47,601 psi | 73% | 2854 fps | 95.9% |
| Somchem S365 | <<locked>> | 80% | 43,178 psi | 66% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,189 psi | 60% | 2730 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 51,547 psi | 79% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,529 psi | 73% | 2890 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 38,957 psi | 60% | 2713 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 46,949 psi | 72% | 2890 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 37,855 psi | 58% | 2746 fps | 99.2% |
| Vihtavuori N560 | <<locked>> | 86% | 45,963 psi | 71% | 2949 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 43,279 psi | 67% | 2871 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 50,415 psi | 78% | 3045 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,021 psi | 72% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,805 psi | 75% | 2959 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,182 psi | 46% | 2671 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,566 psi | 59% | 2710 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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Frontier PH HPFB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,235 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:13.0 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. Accurate MAGPRO, Ramshot Grand, Alliant Reloder-26 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Frontier PH HPFB 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.