Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .307 | 165gr | Rhino Solid Shank 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% | 58,581 psi | 90% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,969 psi | 85% | 2923 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 57,406 psi | 88% | 3045 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 88% | 55,956 psi | 86% | 2982 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 58,117 psi | 89% | 3048 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 56,478 psi | 87% | 3009 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,039 psi | 79% | 2969 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,260 psi | 87% | 2979 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,927 psi | 86% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 55,651 psi | 86% | 2972 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 58,421 psi | 90% | 3041 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,072 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,101 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,029 psi | 88% | 3041 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,172 psi | 83% | 3022 fps | 96.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 55,579 psi | 86% | 2943 fps | 96.8% |
| Bofors RP15 | <<locked>> | 94% | 57,566 psi | 89% | 3028 fps | 99.8% |
| Bofors RP30 | <<locked>> | 98% | 55,912 psi | 86% | 3018 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 58,421 psi | 90% | 3041 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 56,594 psi | 87% | 2927 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 58,320 psi | 90% | 3038 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 56,521 psi | 87% | 2979 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,755 psi | 90% | 2992 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,522 psi | 89% | 2982 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 56,507 psi | 87% | 2966 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,333 psi | 87% | 2904 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 54,911 psi | 85% | 3091 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,493 psi | 88% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 57% | 1936 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,624 psi | 90% | 2963 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,885 psi | 89% | 2949 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 55,347 psi | 85% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,175 psi | 90% | 2966 fps | 99% |
| IMR 7828 SSC | <<locked>> | 92% | 56,144 psi | 86% | 3025 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 46,499 psi | 72% | 2874 fps | 97.9% |
| Lovex S065 | <<locked>> | 82% | 55,288 psi | 85% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,305 psi | 88% | 2943 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,144 psi | 86% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,260 psi | 87% | 2966 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 47,021 psi | 72% | 2900 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 58,624 psi | 90% | 3061 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,043 psi | 88% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 57,290 psi | 88% | 3045 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 56,072 psi | 86% | 2966 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,043 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,159 psi | 59% | 1978 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 55,245 psi | 85% | 2943 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,740 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,260 psi | 87% | 3087 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,753 psi | 86% | 3038 fps | 98.6% |
| Rottweil R 904 | <<locked>> | 88% | 56,855 psi | 88% | 2953 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 88% | 55,332 psi | 85% | 2963 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 56,594 psi | 87% | 2927 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 55,288 psi | 85% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,305 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,015 psi | 89% | 2897 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,726 psi | 90% | 3015 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 58,653 psi | 90% | 2936 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 58,131 psi | 89% | 2963 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 55,724 psi | 86% | 2933 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 84% | 58,769 psi | 90% | 2953 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 55,680 psi | 86% | 2913 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 57,957 psi | 89% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,030 psi | 89% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,131 psi | 89% | 3058 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 58,726 psi | 90% | 3041 fps | 99.3% |
| Vihtavuori N568 | <<locked>> | 98% | 56,217 psi | 87% | 3041 fps | 98.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 3097 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,508 psi | 90% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 56,724 psi | 87% | 2979 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 55,434 psi | 85% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 55,695 psi | 86% | 2927 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% | 38,696 psi | 60% | 2618 fps | 98.6% |
| Accurate 4350 | <<locked>> | 80% | 51,329 psi | 79% | 2871 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,946 psi | 66% | 2785 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 42,641 psi | 66% | 2746 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 40,930 psi | 63% | 2736 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 90% | 39,929 psi | 61% | 2703 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 31,633 psi | 49% | 2539 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,047 psi | 66% | 2749 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,979 psi | 75% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,656 psi | 66% | 2743 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,566 psi | 59% | 2680 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,231 psi | 57% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,242 psi | 50% | 2556 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,843 psi | 64% | 2792 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,299 psi | 77% | 2953 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,892 psi | 75% | 2825 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 35,955 psi | 55% | 2618 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 39,465 psi | 61% | 2717 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 38,566 psi | 59% | 2680 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 53,055 psi | 82% | 2871 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 38,000 psi | 58% | 2664 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 52,765 psi | 81% | 2920 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,911 psi | 85% | 2933 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 43,656 psi | 67% | 2740 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,859 psi | 66% | 2726 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,137 psi | 71% | 2756 fps | 100% |
| Hodgdon Retumbo | 81.4 gr | 84% | 36,143 psi | 56% | 2700 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 53,417 psi | 82% | 2949 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 43% | 1739 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,414 psi | 75% | 2805 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,331 psi | 84% | 2894 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,530 psi | 75% | 2812 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,119 psi | 65% | 2684 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 82% | 39,523 psi | 61% | 2713 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 96% | 40,379 psi | 62% | 2753 fps | 96.1% |
| Lovex S065 | <<locked>> | 80% | 51,866 psi | 80% | 2844 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,401 psi | 78% | 2838 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,214 psi | 51% | 2493 fps | 96.9% |
| Norma 204 | <<locked>> | 80% | 48,936 psi | 75% | 2844 fps | 98.6% |
| Norma 217 | <<locked>> | 90% | 32,909 psi | 51% | 2592 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 40,901 psi | 63% | 2756 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 49,980 psi | 77% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,378 psi | 61% | 2720 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 48,921 psi | 75% | 2851 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 82% | 35,302 psi | 54% | 2595 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,616 psi | 44% | 1778 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,561 psi | 79% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,806 psi | 77% | 2910 fps | 100% |
| ReloadSwiss RS 76 | 85 gr | 82% | 32,996 psi | 51% | 2605 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,990 psi | 68% | 2831 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 43,729 psi | 67% | 2723 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 42,047 psi | 65% | 2726 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 53,055 psi | 82% | 2871 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,866 psi | 80% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,401 psi | 78% | 2838 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,966 psi | 78% | 2792 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,756 psi | 64% | 2723 fps | 97.3% |
| Somchem S361 | <<locked>> | 80% | 44,730 psi | 69% | 2710 fps | 96.2% |
| Somchem S365 | <<locked>> | 80% | 47,384 psi | 73% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,612 psi | 66% | 2707 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 80% | 51,358 psi | 79% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,086 psi | 57% | 2579 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 80% | 50,850 psi | 78% | 2851 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,640 psi | 64% | 2723 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,799 psi | 63% | 2743 fps | 95% |
| Vihtavuori N565 | <<locked>> | 86% | 41,452 psi | 64% | 2736 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 45,034 psi | 69% | 2844 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 98% | 53,229 psi | 82% | 3028 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,923 psi | 78% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,953 psi | 81% | 2923 fps | 99.9% |
| Winchester StaBALL HD | 79.6 gr | 80% | 34,258 psi | 53% | 2674 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,218 psi | 60% | 2631 fps | 96.5% |
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 .307 | 165gr | Rhino Solid Shank. Vihtavuori N570 delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,936 fps to 3,097 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 165.0 gr projectile in 0.307" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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 .307 | 165gr | Rhino Solid Shank 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.