Two designs I would like to see for the .223 Rem is the 6.5x55 160gn "cruise missile" and the .300 Blackout 230gn. Shouldn't be all too hard to draw them, maybe the Mountain Mold software could be used?
I would really like a 100gn plainbase design that could be driven to 1550-1600 fps for cheap IPSC competition, and for most guys it could fill the subsonic wants for those reluctant to get a Blackout. Most 1:7 or 1:8 barrels should be able to stabilize such a bullet Up to moderate rifle distance like 100-300 yards.