Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Peregrine VLR-4 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, Norma MRP 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 55,071 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,956 psi | 86% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,262 psi | 90% | 3166 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 56,869 psi | 88% | 3028 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,479 psi | 88% | 3114 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 55,347 psi | 85% | 3110 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,806 psi | 77% | 2995 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,382 psi | 68% | 2946 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,218 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,058 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,624 psi | 90% | 3133 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,971 psi | 88% | 3097 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,303 psi | 85% | 3104 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,608 psi | 87% | 3084 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,377 psi | 88% | 3166 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,377 psi | 88% | 3064 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 58,218 psi | 90% | 3146 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,156 psi | 80% | 3064 fps | 98.2% |
| Bofors RP5 | <<locked>> | 94% | 55,303 psi | 85% | 3104 fps | 99.2% |
| Bofors RP7 | <<locked>> | 86% | 58,349 psi | 90% | 3064 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 3091 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 57,986 psi | 89% | 3114 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,826 psi | 87% | 3071 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 55,230 psi | 85% | 3048 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,957 psi | 89% | 3091 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,363 psi | 88% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3202 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,969 psi | 85% | 3081 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 2005 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,579 psi | 87% | 3041 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,318 psi | 87% | 3035 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 56,362 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,144 psi | 86% | 3035 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 57,043 psi | 88% | 3146 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 56,724 psi | 87% | 3028 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,740 psi | 90% | 3077 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 88% | 58,059 psi | 89% | 3100 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 39,653 psi | 61% | 2858 fps | 97% |
| Norma MRP | <<locked>> | 92% | 55,245 psi | 85% | 3127 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 58,305 psi | 90% | 3097 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,291 psi | 90% | 3169 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 57,464 psi | 88% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,826 psi | 87% | 3094 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,044 psi | 89% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,434 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,969 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,492 psi | 87% | 3202 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,416 psi | 79% | 3071 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 55,825 psi | 86% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,421 psi | 90% | 3081 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 56,318 psi | 87% | 3087 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 58,349 psi | 90% | 3064 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,724 psi | 87% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,740 psi | 90% | 3077 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,856 psi | 89% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,782 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,275 psi | 87% | 2979 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,883 psi | 86% | 3081 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 55,564 psi | 86% | 3009 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,652 psi | 87% | 3009 fps | 97.9% |
| Somchem S365 | <<locked>> | 88% | 54,955 psi | 85% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,826 psi | 87% | 3058 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 57,043 psi | 88% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,333 psi | 87% | 3031 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,594 psi | 87% | 3031 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 55,695 psi | 86% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,494 psi | 90% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,027 psi | 85% | 3117 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 98% | 55,114 psi | 85% | 3091 fps | 98.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,199 psi | 80% | 3077 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,478 psi | 87% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,189 psi | 90% | 3114 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,824 psi | 84% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,261 psi | 88% | 3051 fps | 99.3% |
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% | 33,402 psi | 51% | 2595 fps | 95.9% |
| Accurate 4350 | <<locked>> | 80% | 45,150 psi | 69% | 2881 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 88% | 46,601 psi | 72% | 2963 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 53,374 psi | 82% | 2976 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,422 psi | 62% | 2802 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 88% | 44,672 psi | 69% | 2913 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 96% | 43,105 psi | 66% | 2864 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 94% | 35,998 psi | 55% | 2746 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,447 psi | 84% | 2999 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,323 psi | 67% | 2890 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,488 psi | 78% | 3015 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,393 psi | 62% | 2792 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,783 psi | 60% | 2785 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,082 psi | 49% | 2628 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,126 psi | 49% | 2644 fps | 96.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,462 psi | 55% | 2762 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,766 psi | 83% | 3002 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 41,263 psi | 64% | 2841 fps | 95.9% |
| Bofors RP30 | <<locked>> | 94% | 41,872 psi | 64% | 2871 fps | 95.5% |
| Bofors RP5 | <<locked>> | 84% | 38,783 psi | 60% | 2785 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 48,008 psi | 74% | 2890 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 92% | 41,234 psi | 63% | 2825 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 47,050 psi | 72% | 2930 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,647 psi | 76% | 2953 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 47,776 psi | 74% | 2920 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,905 psi | 72% | 2904 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,727 psi | 63% | 2769 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,595 psi | 59% | 2858 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 47,007 psi | 72% | 2946 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 42% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,584 psi | 67% | 2815 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,545 psi | 76% | 2923 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 43,033 psi | 66% | 2825 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 46,122 psi | 71% | 2861 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 42,772 psi | 66% | 2881 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 46,775 psi | 72% | 2864 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 45,078 psi | 69% | 2848 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 32,605 psi | 50% | 2575 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 43,627 psi | 67% | 2848 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 36,956 psi | 57% | 2792 fps | 96% |
| Norma MRP | 78.5 gr | 80% | 35,114 psi | 54% | 2726 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 44,324 psi | 68% | 2867 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 42,815 psi | 66% | 2890 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 43,424 psi | 67% | 2858 fps | 98.7% |
| Ramshot Magnum | <<locked>> | 88% | 38,261 psi | 59% | 2759 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 43% | 1844 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,751 psi | 83% | 3064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,440 psi | 70% | 2900 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,801 psi | 67% | 2913 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,563 psi | 55% | 2766 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,268 psi | 73% | 2995 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 52,054 psi | 80% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,744 psi | 69% | 2844 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 82% | 39,711 psi | 61% | 2779 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 48,008 psi | 74% | 2890 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,775 psi | 72% | 2864 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 45,078 psi | 69% | 2848 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,896 psi | 83% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,301 psi | 80% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,861 psi | 71% | 2808 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,407 psi | 61% | 2772 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 51,924 psi | 80% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,992 psi | 71% | 2828 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 41,408 psi | 64% | 2825 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,550 psi | 58% | 2700 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 49,763 psi | 77% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,934 psi | 71% | 2867 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,304 psi | 57% | 2680 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,324 psi | 70% | 2864 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,998 psi | 55% | 2710 fps | 98.7% |
| Vihtavuori N560 | 84.4 gr | 86% | 44,179 psi | 68% | 2917 fps | 95% |
| Vihtavuori N565 | <<locked>> | 92% | 44,367 psi | 68% | 2897 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 98% | 48,356 psi | 74% | 3009 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,382 psi | 70% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,224 psi | 73% | 2933 fps | 98.8% |
| Winchester StaBALL HD | 77.7 gr | 80% | 28,485 psi | 44% | 2618 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,711 psi | 61% | 2740 fps | 95.4% |
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 82 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Peregrine VLR-4. Hodgdon Retumbo delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,202 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 1:11.5 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, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Peregrine VLR-4 they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 Enduron burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.