Triple diameter expansion with terminal performance beyond competing 300 Blackout subsonic offerings found on the market. Designed for the 1:7t & 1:8t barrels commonplace in the market. This is an excellent choice if you have a Ruger American Ranch 1:7t with the rotary magazine as these feed 100% reliably. It is also my personal favorite in a 1:5t due to the high BC and twist rate combo.