Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .307 | 165gr | Rhino Penetrator 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,593 psi | 86% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,275 psi | 87% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,508 psi | 90% | 3061 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 90% | 57,276 psi | 88% | 2999 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 55,434 psi | 85% | 3002 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 2959 fps | 99% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2920 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,595 psi | 89% | 2995 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,232 psi | 88% | 2999 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,566 psi | 90% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,898 psi | 88% | 2989 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,695 psi | 86% | 3002 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,014 psi | 88% | 2969 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,811 psi | 87% | 3031 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,914 psi | 89% | 3058 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,855 psi | 88% | 2956 fps | 96.8% |
| Bofors RP15 | <<locked>> | 96% | 58,595 psi | 90% | 3041 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,579 psi | 87% | 3031 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 55,695 psi | 86% | 3002 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 58,073 psi | 89% | 2943 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 55,245 psi | 85% | 2989 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 58,001 psi | 89% | 2995 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,478 psi | 87% | 2953 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 90% | 54,998 psi | 85% | 2936 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,870 psi | 89% | 2982 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,580 psi | 89% | 2920 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,695 psi | 86% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,752 psi | 84% | 2969 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,333 psi | 87% | 2927 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,912 psi | 86% | 2913 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 56,739 psi | 87% | 2933 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,782 psi | 86% | 2923 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 57,334 psi | 88% | 3041 fps | 99.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,555 psi | 67% | 2822 fps | 96.9% |
| Lovex S065 | <<locked>> | 84% | 56,637 psi | 87% | 2910 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,639 psi | 90% | 2959 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,101 psi | 88% | 2927 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,769 psi | 89% | 2986 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,918 psi | 68% | 2848 fps | 98.9% |
| Norma MRP | <<locked>> | 90% | 55,593 psi | 86% | 3018 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,291 psi | 90% | 2979 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,407 psi | 90% | 3061 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 57,406 psi | 88% | 2982 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,174 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,463 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,969 psi | 85% | 2989 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,971 psi | 88% | 3097 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 3051 fps | 98.5% |
| Rottweil R 904 | <<locked>> | 90% | 58,233 psi | 90% | 2966 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 56,318 psi | 87% | 2976 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 58,073 psi | 89% | 2943 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,637 psi | 87% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,639 psi | 90% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,912 psi | 86% | 2864 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,912 psi | 86% | 2972 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 56,246 psi | 87% | 2897 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 55,361 psi | 85% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,000 psi | 88% | 2946 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,869 psi | 88% | 2858 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,260 psi | 87% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,782 psi | 87% | 2927 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,593 psi | 86% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,448 psi | 85% | 2949 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,259 psi | 85% | 3015 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 96% | 55,593 psi | 86% | 2992 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,956 psi | 88% | 3054 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,956 psi | 86% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,001 psi | 89% | 2995 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,796 psi | 86% | 3051 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,101 psi | 88% | 2943 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% | 36,753 psi | 57% | 2575 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 48,994 psi | 75% | 2835 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,729 psi | 67% | 2802 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 40,698 psi | 63% | 2707 fps | 96.6% |
| ADI AR 2213 | <<locked>> | 84% | 41,887 psi | 64% | 2756 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 40,625 psi | 63% | 2717 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 32,169 psi | 50% | 2552 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,147 psi | 63% | 2707 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,775 psi | 72% | 2838 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,389 psi | 84% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,770 psi | 63% | 2700 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,651 psi | 56% | 2638 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,302 psi | 54% | 2605 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,632 psi | 47% | 2510 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,363 psi | 61% | 2749 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,096 psi | 77% | 2841 fps | 95.1% |
| Bofors RP15 | <<locked>> | 82% | 36,593 psi | 56% | 2635 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 39,972 psi | 62% | 2733 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 36,651 psi | 56% | 2638 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 51,184 psi | 79% | 2838 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,725 psi | 60% | 2677 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 50,662 psi | 78% | 2884 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 52,837 psi | 81% | 2897 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 84% | 44,744 psi | 69% | 2759 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,903 psi | 68% | 2743 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,092 psi | 68% | 2720 fps | 100% |
| Hodgdon Retumbo | 80 gr | 86% | 36,695 psi | 56% | 2717 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,894 psi | 78% | 2907 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,470 psi | 72% | 2762 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,359 psi | 81% | 2858 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,383 psi | 71% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,221 psi | 67% | 2703 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 84% | 40,379 psi | 62% | 2730 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,654 psi | 63% | 2759 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 49,995 psi | 77% | 2808 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,385 psi | 74% | 2799 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 31,589 psi | 49% | 2451 fps | 96.1% |
| Norma 204 | <<locked>> | 80% | 46,833 psi | 72% | 2805 fps | 98% |
| Norma 217 | <<locked>> | 92% | 33,156 psi | 51% | 2602 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 38,566 psi | 59% | 2710 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 47,805 psi | 74% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 40,103 psi | 62% | 2733 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 46,717 psi | 72% | 2812 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 82% | 33,446 psi | 51% | 2549 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,413 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,211 psi | 76% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,471 psi | 73% | 2874 fps | 100% |
| ReloadSwiss RS 76 | 83.6 gr | 84% | 33,576 psi | 52% | 2621 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,541 psi | 69% | 2844 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,018 psi | 65% | 2687 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 40,219 psi | 62% | 2687 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 80% | 51,184 psi | 79% | 2838 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,995 psi | 77% | 2808 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,385 psi | 74% | 2799 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,037 psi | 75% | 2756 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,885 psi | 61% | 2684 fps | 96.5% |
| Somchem S361 | <<locked>> | 80% | 42,989 psi | 66% | 2671 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 45,020 psi | 69% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,741 psi | 63% | 2667 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 53,156 psi | 82% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,226 psi | 76% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,302 psi | 54% | 2536 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,646 psi | 75% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,624 psi | 61% | 2684 fps | 99.8% |
| Vihtavuori N560 | <<locked>> | 82% | 41,582 psi | 64% | 2762 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 42,076 psi | 65% | 2749 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 94% | 45,513 psi | 70% | 2854 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,762 psi | 75% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,662 psi | 78% | 2884 fps | 99.7% |
| Winchester StaBALL HD | 76.4 gr | 80% | 31,763 psi | 49% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,304 psi | 57% | 2589 fps | 95.5% |
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 Penetrator. Hodgdon Retumbo delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,104 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 1:11.5 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, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Rem. Ultra Mag. with the .307 | 165gr | Rhino Penetrator 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.