Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .309 | 170gr | Reichenberg HDB Universal 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, ReloadSwiss RS 76 and Vihtavuori N560.
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% | 56,594 psi | 87% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,290 psi | 88% | 2927 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,782 psi | 86% | 2989 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 58,697 psi | 90% | 2992 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,840 psi | 87% | 2995 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,882 psi | 84% | 2956 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,501 psi | 76% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 58,711 psi | 90% | 2986 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,450 psi | 90% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,015 psi | 89% | 2976 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,985 psi | 88% | 2989 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,436 psi | 90% | 2953 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 58,566 psi | 90% | 3018 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,187 psi | 85% | 2986 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,257 psi | 80% | 2963 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,957 psi | 89% | 2953 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 55,956 psi | 86% | 2972 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3025 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 56,985 psi | 88% | 2989 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 55,332 psi | 85% | 2877 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 56,739 psi | 87% | 2986 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 55,129 psi | 85% | 2927 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,435 psi | 88% | 2940 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 56,231 psi | 87% | 2933 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,027 psi | 85% | 2910 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 58,581 psi | 90% | 2900 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 57,377 psi | 88% | 3097 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,086 psi | 86% | 2959 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,202 psi | 57% | 1903 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,421 psi | 88% | 2917 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,826 psi | 87% | 2900 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,580 psi | 89% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,942 psi | 88% | 2917 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 54,766 psi | 84% | 2972 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,701 psi | 69% | 2815 fps | 97.6% |
| Lovex S065 | <<locked>> | 84% | 57,638 psi | 89% | 2897 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,825 psi | 86% | 2890 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,885 psi | 89% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,013 psi | 85% | 2917 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 45,136 psi | 69% | 2841 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 56,942 psi | 88% | 3009 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,579 psi | 86% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,666 psi | 86% | 2992 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 58,552 psi | 90% | 2969 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,755 psi | 90% | 2982 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 59% | 1946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,754 psi | 89% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,275 psi | 87% | 2976 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,798 psi | 90% | 3094 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,044 psi | 89% | 3045 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 55,680 psi | 86% | 2904 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 57,653 psi | 89% | 2969 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,332 psi | 85% | 2877 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,638 psi | 89% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,825 psi | 86% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,623 psi | 87% | 2848 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,217 psi | 88% | 2963 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 57,450 psi | 88% | 2890 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 56,594 psi | 87% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,914 psi | 89% | 2933 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,522 psi | 89% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,363 psi | 88% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,943 psi | 89% | 2917 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,565 psi | 87% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,449 psi | 87% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,550 psi | 87% | 3005 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 56,869 psi | 88% | 2982 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3048 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 3038 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,188 psi | 88% | 2851 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,332 psi | 85% | 2927 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,769 psi | 89% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,320 psi | 90% | 2933 fps | 99.8% |
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% | 37,057 psi | 57% | 2559 fps | 98.3% |
| Accurate 4350 | <<locked>> | 80% | 49,676 psi | 76% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 44,744 psi | 69% | 2799 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 41,452 psi | 64% | 2697 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 39,639 psi | 61% | 2684 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 90% | 38,609 psi | 59% | 2648 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 88% | 32,518 psi | 50% | 2543 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,829 psi | 64% | 2694 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,645 psi | 73% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,452 psi | 64% | 2687 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,231 psi | 57% | 2625 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,940 psi | 55% | 2589 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,966 psi | 48% | 2497 fps | 97.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,263 psi | 62% | 2736 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 48,341 psi | 74% | 2894 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,952 psi | 78% | 2835 fps | 95.9% |
| Bofors RP15 | <<locked>> | 82% | 37,057 psi | 57% | 2621 fps | 95.8% |
| Bofors RP30 | <<locked>> | 88% | 37,869 psi | 58% | 2657 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 37,231 psi | 57% | 2625 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 51,750 psi | 80% | 2822 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 36,637 psi | 56% | 2608 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 51,532 psi | 79% | 2871 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,766 psi | 83% | 2884 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 42,351 psi | 65% | 2690 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,568 psi | 64% | 2674 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,730 psi | 69% | 2700 fps | 100% |
| Hodgdon Retumbo | 79.6 gr | 84% | 34,795 psi | 54% | 2644 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 51,967 psi | 80% | 2897 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 43% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,239 psi | 73% | 2753 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,243 psi | 82% | 2848 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 47,094 psi | 72% | 2759 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,017 psi | 63% | 2635 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 84% | 41,031 psi | 63% | 2720 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,725 psi | 60% | 2690 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,691 psi | 78% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,052 psi | 75% | 2785 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 31,676 psi | 49% | 2431 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 47,790 psi | 74% | 2795 fps | 98.5% |
| Norma 217 | <<locked>> | 92% | 33,736 psi | 52% | 2592 fps | 96% |
| Norma MRP | <<locked>> | 80% | 39,378 psi | 61% | 2697 fps | 98% |
| Norma URP | <<locked>> | 80% | 48,602 psi | 75% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,971 psi | 58% | 2664 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,688 psi | 73% | 2802 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 33,924 psi | 52% | 2539 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 44% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,009 psi | 77% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,428 psi | 75% | 2858 fps | 100% |
| ReloadSwiss RS 76 | 83.2 gr | 82% | 31,676 psi | 49% | 2546 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,192 psi | 65% | 2772 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 42,554 psi | 65% | 2674 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 80% | 40,727 psi | 63% | 2674 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 80% | 51,750 psi | 80% | 2822 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,691 psi | 78% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,052 psi | 75% | 2785 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,676 psi | 76% | 2743 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,393 psi | 62% | 2667 fps | 97.1% |
| Somchem S361 | <<locked>> | 80% | 43,497 psi | 67% | 2657 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 45,876 psi | 71% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,234 psi | 63% | 2654 fps | 98.1% |
| Vihtavuori N150 | <<locked>> | 80% | 53,940 psi | 83% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,067 psi | 77% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,810 psi | 55% | 2526 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,356 psi | 76% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,016 psi | 62% | 2664 fps | 99.9% |
| Vihtavuori N560 | 80.6 gr | 82% | 42,293 psi | 65% | 2749 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 86% | 39,958 psi | 61% | 2677 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 43,453 psi | 67% | 2789 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 51,329 psi | 79% | 2972 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,516 psi | 76% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,721 psi | 80% | 2874 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,706 psi | 50% | 2612 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,826 psi | 58% | 2579 fps | 96.2% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .309 | 170gr | Reichenberg HDB Universal. Hodgdon Retumbo delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,903 fps to 3,097 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 170.0 gr projectile in 0.309" calls for a 1:12.5 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, ReloadSwiss RS 76, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .309 | 170gr | Reichenberg HDB Universal 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.