Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | Brenneke TOG 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, ReloadSwiss RS 76 and Winchester StaBALL HD.
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% | 58,044 psi | 89% | 2943 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,465 psi | 90% | 2972 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,913 psi | 88% | 3038 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 88% | 55,637 psi | 86% | 2979 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 57,624 psi | 89% | 3041 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3002 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,647 psi | 78% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,564 psi | 86% | 2979 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,361 psi | 85% | 2966 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,899 psi | 89% | 3035 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 55,709 psi | 86% | 2953 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 55,579 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,492 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 53,737 psi | 83% | 3015 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,798 psi | 90% | 2992 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 57,058 psi | 88% | 3018 fps | 99.7% |
| Bofors RP30 | <<locked>> | 98% | 55,448 psi | 85% | 3015 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 57,899 psi | 89% | 3035 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 56,231 psi | 87% | 2923 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 57,841 psi | 89% | 3031 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 56,217 psi | 87% | 2972 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,392 psi | 90% | 2986 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 57,246 psi | 88% | 2976 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,043 psi | 86% | 2959 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,999 psi | 86% | 2900 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,320 psi | 90% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,000 psi | 88% | 3005 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,305 psi | 90% | 2959 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,580 psi | 89% | 2943 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,740 psi | 90% | 2963 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,754 psi | 89% | 2959 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 55,811 psi | 86% | 3018 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,050 psi | 71% | 2867 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 58,537 psi | 90% | 2943 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,956 psi | 88% | 2940 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 55,637 psi | 86% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,941 psi | 86% | 2959 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 46,557 psi | 72% | 2894 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 58,117 psi | 89% | 3054 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,710 psi | 87% | 2956 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,956 psi | 88% | 3041 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 55,738 psi | 86% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 55,550 psi | 85% | 2969 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,159 psi | 59% | 1978 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,911 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,421 psi | 88% | 3022 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 55,550 psi | 85% | 3077 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,114 psi | 85% | 3028 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 88% | 56,550 psi | 87% | 2949 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 58,639 psi | 90% | 3012 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 56,231 psi | 87% | 2923 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,537 psi | 90% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,956 psi | 88% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,696 psi | 89% | 2894 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,204 psi | 90% | 3009 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 58,421 psi | 90% | 2936 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 57,740 psi | 89% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,405 psi | 85% | 2930 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 58,653 psi | 90% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,247 psi | 90% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,230 psi | 85% | 2907 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 57,638 psi | 89% | 2949 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,711 psi | 89% | 2979 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,638 psi | 89% | 3054 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 58,247 psi | 90% | 3031 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 55,550 psi | 85% | 3031 fps | 98.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,608 psi | 87% | 3087 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,015 psi | 89% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,217 psi | 87% | 2972 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 54,810 psi | 84% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,274 psi | 85% | 2920 fps | 99.6% |
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% | 38,392 psi | 59% | 2612 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 50,952 psi | 78% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 45,818 psi | 71% | 2844 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 42,366 psi | 65% | 2743 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 40,654 psi | 63% | 2730 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 39,537 psi | 61% | 2697 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 31,401 psi | 48% | 2533 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,588 psi | 75% | 2871 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,351 psi | 65% | 2736 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,261 psi | 59% | 2674 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,898 psi | 57% | 2638 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,010 psi | 49% | 2549 fps | 97.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,350 psi | 64% | 2785 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,676 psi | 76% | 2943 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,851 psi | 80% | 2881 fps | 95.9% |
| Bofors RP15 | <<locked>> | 82% | 38,218 psi | 59% | 2671 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 39,160 psi | 60% | 2710 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 38,261 psi | 59% | 2674 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 52,721 psi | 81% | 2867 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 37,637 psi | 58% | 2654 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 52,446 psi | 81% | 2917 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,592 psi | 84% | 2930 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 43,352 psi | 67% | 2736 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,598 psi | 66% | 2720 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,774 psi | 70% | 2749 fps | 100% |
| Hodgdon Retumbo | 80.9 gr | 84% | 35,853 psi | 55% | 2697 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 52,924 psi | 81% | 2943 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,905 psi | 43% | 1736 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,109 psi | 74% | 2799 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,056 psi | 83% | 2890 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,182 psi | 74% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,858 psi | 64% | 2677 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 82% | 39,247 psi | 60% | 2707 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,943 psi | 61% | 2743 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 51,532 psi | 79% | 2838 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,082 psi | 77% | 2835 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 32,895 psi | 51% | 2487 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 48,646 psi | 75% | 2841 fps | 98.5% |
| Norma 217 | <<locked>> | 90% | 32,677 psi | 50% | 2589 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 40,422 psi | 62% | 2749 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 49,632 psi | 76% | 2851 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 38,928 psi | 60% | 2710 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 48,588 psi | 75% | 2848 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 35,056 psi | 54% | 2592 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 44% | 1775 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,213 psi | 79% | 2884 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,487 psi | 76% | 2907 fps | 100% |
| ReloadSwiss RS 76 | 84.5 gr | 82% | 32,793 psi | 50% | 2598 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,526 psi | 67% | 2825 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 43,439 psi | 67% | 2720 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 41,727 psi | 64% | 2720 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 52,721 psi | 81% | 2867 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,532 psi | 79% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,082 psi | 77% | 2835 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,662 psi | 78% | 2789 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,437 psi | 64% | 2717 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 44,469 psi | 68% | 2703 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 47,021 psi | 72% | 2805 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,322 psi | 65% | 2700 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 54,969 psi | 85% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 51,010 psi | 79% | 2841 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,811 psi | 57% | 2575 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 50,502 psi | 78% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,307 psi | 64% | 2717 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 43,337 psi | 67% | 2799 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 41,176 psi | 63% | 2733 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 92% | 44,570 psi | 69% | 2835 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 98% | 52,533 psi | 81% | 3022 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,444 psi | 78% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,620 psi | 81% | 2920 fps | 99.9% |
| Winchester StaBALL HD | 79.1 gr | 80% | 33,852 psi | 52% | 2667 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,783 psi | 60% | 2625 fps | 96.3% |
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 | 165gr | Brenneke TOG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,146 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,146 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 165.0 gr projectile in 0.308" calls for a 1:14.0 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, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 165gr | Brenneke TOG they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, 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.