Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Nosler Ballistic Silver Tip bullet and 73 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% | 55,332 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,840 psi | 86% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,262 psi | 90% | 3163 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 56,985 psi | 88% | 3104 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 55,027 psi | 85% | 3104 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,403 psi | 82% | 3061 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,066 psi | 74% | 3015 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,782 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,146 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,565 psi | 87% | 3091 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,317 psi | 85% | 3100 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,681 psi | 87% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,608 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,769 psi | 89% | 3166 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,782 psi | 87% | 3058 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 58,189 psi | 90% | 3143 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,347 psi | 87% | 3130 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,317 psi | 85% | 3100 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,667 psi | 89% | 3051 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,940 psi | 85% | 3087 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,580 psi | 89% | 3104 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,159 psi | 86% | 3061 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 58,682 psi | 90% | 3100 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,479 psi | 88% | 3084 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,029 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,347 psi | 85% | 3205 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 58,682 psi | 90% | 3136 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 57% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,043 psi | 86% | 3035 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,463 psi | 85% | 3018 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,217 psi | 87% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,550 psi | 85% | 3028 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 57,000 psi | 88% | 3143 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,337 psi | 67% | 2907 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 56,463 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,363 psi | 90% | 3068 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,710 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,334 psi | 88% | 3087 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,787 psi | 67% | 2940 fps | 98.4% |
| Norma MRP | <<locked>> | 90% | 55,288 psi | 85% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 58,015 psi | 89% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,175 psi | 90% | 3163 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,000 psi | 88% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,826 psi | 87% | 3091 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,898 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,275 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,650 psi | 84% | 3094 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,898 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,246 psi | 87% | 3146 fps | 98% |
| Rottweil R 904 | <<locked>> | 90% | 58,030 psi | 89% | 3074 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 56,057 psi | 86% | 3077 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,667 psi | 89% | 3051 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,463 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,363 psi | 90% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,334 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,564 psi | 86% | 2969 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,622 psi | 86% | 3074 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 58,581 psi | 90% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,028 psi | 86% | 2999 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 54,998 psi | 85% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,623 psi | 87% | 3048 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,347 psi | 87% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,854 psi | 86% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,492 psi | 87% | 3028 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,259 psi | 85% | 3025 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,056 psi | 85% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,969 psi | 85% | 3110 fps | 98% |
| Vihtavuori N565 | <<locked>> | 96% | 55,521 psi | 85% | 3094 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,695 psi | 87% | 3150 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,811 psi | 86% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,769 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,535 psi | 85% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,811 psi | 87% | 3045 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% | 36,390 psi | 56% | 2661 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,544 psi | 75% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,833 psi | 72% | 2963 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 40,350 psi | 62% | 2795 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 44,556 psi | 69% | 2910 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 43,308 psi | 67% | 2867 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 34,185 psi | 53% | 2694 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,311 psi | 71% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,157 psi | 83% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,408 psi | 62% | 2792 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,088 psi | 60% | 2789 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,882 psi | 54% | 2690 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,356 psi | 47% | 2585 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,015 psi | 60% | 2835 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,200 psi | 82% | 2995 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 38,725 psi | 60% | 2779 fps | 95.1% |
| Bofors RP30 | <<locked>> | 92% | 42,540 psi | 65% | 2881 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 39,088 psi | 60% | 2789 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,749 psi | 78% | 2940 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,379 psi | 64% | 2831 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 50,227 psi | 77% | 2982 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,533 psi | 81% | 3002 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,425 psi | 68% | 2851 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,717 psi | 72% | 2897 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,685 psi | 67% | 2818 fps | 100% |
| Hodgdon Retumbo | 86.3 gr | 88% | 39,030 psi | 60% | 2867 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,473 psi | 78% | 3005 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,151 psi | 71% | 2864 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,083 psi | 80% | 2966 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,035 psi | 71% | 2877 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,788 psi | 70% | 2854 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 42,960 psi | 66% | 2884 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,422 psi | 62% | 2844 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,603 psi | 76% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,080 psi | 74% | 2900 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,256 psi | 48% | 2533 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 46,572 psi | 72% | 2904 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,317 psi | 54% | 2743 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 38,247 psi | 59% | 2795 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 47,471 psi | 73% | 2920 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,902 psi | 66% | 2890 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,485 psi | 72% | 2913 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,766 psi | 55% | 2697 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,834 psi | 75% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,963 psi | 72% | 2969 fps | 99.9% |
| ReloadSwiss RS 76 | 90.3 gr | 86% | 36,027 psi | 55% | 2776 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,964 psi | 74% | 3005 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 82% | 44,570 psi | 69% | 2841 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 39,726 psi | 61% | 2776 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,749 psi | 78% | 2940 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,603 psi | 76% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,080 psi | 74% | 2900 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,882 psi | 84% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,675 psi | 75% | 2854 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,392 psi | 61% | 2769 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 54,998 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,687 psi | 70% | 2818 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,628 psi | 69% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,466 psi | 62% | 2759 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,823 psi | 81% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,820 psi | 75% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,550 psi | 58% | 2684 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,298 psi | 74% | 2917 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,175 psi | 60% | 2772 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 44,309 psi | 68% | 2913 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,991 psi | 69% | 2904 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 48,805 psi | 75% | 3015 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,414 psi | 75% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,401 psi | 78% | 2989 fps | 99.4% |
| Winchester StaBALL HD | 80.6 gr | 80% | 31,401 psi | 48% | 2707 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,755 psi | 61% | 2740 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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Nosler Ballistic Silver Tip. Hodgdon Retumbo delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Nosler Ballistic Silver Tip they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 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.