Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Hornady SP bullet and 72 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,129 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,637 psi | 86% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,914 psi | 89% | 3156 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 56,768 psi | 87% | 3100 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 58,755 psi | 90% | 3159 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,098 psi | 82% | 3054 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,732 psi | 73% | 3009 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,565 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,928 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,420 psi | 87% | 3087 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,114 psi | 85% | 3097 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,521 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,217 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,319 psi | 88% | 3156 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,492 psi | 87% | 3051 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 58,030 psi | 89% | 3140 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 3127 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,114 psi | 85% | 3097 fps | 99.2% |
| Bofors RP7 | <<locked>> | 84% | 57,479 psi | 88% | 3048 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 3146 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 57,392 psi | 88% | 3100 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,970 psi | 86% | 3058 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 58,523 psi | 90% | 3100 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,305 psi | 88% | 3081 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,826 psi | 87% | 3025 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,940 psi | 85% | 3199 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 58,479 psi | 90% | 3133 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,985 psi | 57% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,854 psi | 86% | 3028 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,274 psi | 85% | 3015 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,028 psi | 86% | 3035 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,361 psi | 85% | 3022 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 94% | 56,594 psi | 87% | 3136 fps | 98.7% |
| Lovex S065 | <<locked>> | 84% | 56,246 psi | 87% | 3015 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,146 psi | 89% | 3064 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,536 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,188 psi | 88% | 3084 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,439 psi | 67% | 2933 fps | 98.3% |
| Norma MRP | <<locked>> | 90% | 55,085 psi | 85% | 3117 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,769 psi | 89% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,725 psi | 89% | 3156 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,826 psi | 87% | 3084 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,637 psi | 87% | 3087 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,898 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,508 psi | 90% | 3150 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,536 psi | 87% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 3140 fps | 98% |
| Rottweil R 904 | <<locked>> | 90% | 57,638 psi | 89% | 3068 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 55,854 psi | 86% | 3077 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,479 psi | 88% | 3048 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,246 psi | 87% | 3015 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,146 psi | 89% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,363 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,405 psi | 85% | 2963 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,434 psi | 85% | 3071 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 58,552 psi | 90% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,869 psi | 86% | 2995 fps | 97.9% |
| Somchem S365 | <<locked>> | 88% | 58,595 psi | 90% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,420 psi | 87% | 3045 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,144 psi | 86% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,666 psi | 86% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,144 psi | 86% | 3025 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,085 psi | 85% | 3025 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,581 psi | 90% | 3104 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,726 psi | 90% | 3173 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 96% | 55,129 psi | 85% | 3087 fps | 98.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,318 psi | 87% | 3143 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,463 psi | 85% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,392 psi | 88% | 3100 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,114 psi | 85% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,463 psi | 87% | 3038 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% | 36,245 psi | 56% | 2657 fps | 97.1% |
| Accurate 4350 | <<locked>> | 80% | 48,327 psi | 74% | 2930 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,514 psi | 72% | 2956 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 40,176 psi | 62% | 2792 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 44,396 psi | 68% | 2904 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 43,149 psi | 66% | 2861 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 33,910 psi | 52% | 2687 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,093 psi | 71% | 2936 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,751 psi | 83% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,219 psi | 62% | 2785 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,914 psi | 60% | 2785 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,838 psi | 54% | 2690 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,211 psi | 46% | 2582 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,783 psi | 60% | 2831 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,084 psi | 82% | 2992 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 38,551 psi | 59% | 2776 fps | 95% |
| Bofors RP30 | <<locked>> | 92% | 42,337 psi | 65% | 2874 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 38,914 psi | 60% | 2785 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 50,546 psi | 78% | 2933 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 41,118 psi | 63% | 2822 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,038 psi | 77% | 2979 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,344 psi | 81% | 2999 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 47,355 psi | 73% | 2910 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,514 psi | 72% | 2890 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,511 psi | 67% | 2815 fps | 100% |
| Hodgdon Retumbo | 86 gr | 88% | 38,856 psi | 60% | 2861 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,285 psi | 77% | 3002 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,963 psi | 71% | 2861 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,880 psi | 80% | 2963 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,832 psi | 71% | 2871 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,629 psi | 70% | 2848 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 86% | 42,641 psi | 66% | 2877 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,574 psi | 76% | 2910 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,892 psi | 74% | 2897 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,082 psi | 48% | 2526 fps | 95% |
| Norma 204 | <<locked>> | 80% | 46,383 psi | 71% | 2900 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,172 psi | 54% | 2740 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,029 psi | 59% | 2789 fps | 96.5% |
| Norma URP | <<locked>> | 80% | 47,253 psi | 73% | 2917 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,699 psi | 66% | 2887 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,296 psi | 71% | 2910 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,636 psi | 55% | 2690 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,631 psi | 75% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,775 psi | 72% | 2963 fps | 99.9% |
| ReloadSwiss RS 76 | 89.9 gr | 86% | 35,766 psi | 55% | 2766 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,601 psi | 73% | 2995 fps | 96% |
| Rottweil R 904 | <<locked>> | 82% | 44,382 psi | 68% | 2835 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 39,537 psi | 61% | 2772 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,546 psi | 78% | 2933 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,574 psi | 76% | 2910 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,892 psi | 74% | 2897 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,694 psi | 84% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,501 psi | 75% | 2851 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,204 psi | 60% | 2762 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 54,955 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,527 psi | 70% | 2815 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,396 psi | 68% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,277 psi | 62% | 2756 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,620 psi | 81% | 2910 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,602 psi | 75% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,376 psi | 58% | 2677 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,109 psi | 74% | 2910 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,957 psi | 60% | 2769 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 44,135 psi | 68% | 2910 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 44,628 psi | 69% | 2897 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 48,675 psi | 75% | 3012 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,254 psi | 74% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,212 psi | 77% | 2982 fps | 99.3% |
| Winchester StaBALL HD | 80.3 gr | 80% | 31,169 psi | 48% | 2700 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,595 psi | 61% | 2733 fps | 95.6% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Hornady SP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,199 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 1:15.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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 | 150gr | Hornady SP 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.