Thread: Subsonic 30-30

Cast lead flat nose or hollow point 180 grain bullets. Subsonic there is no need for a gas check and pure lead is soft enough to do quite a bit of expansion even if you don't hit bone.
Accuracy will also probably improve as there not enough pressure to properly set up a jacketed bullet designed for supersonic launching.
Trajectory is the same as for a .22 so it's simple to work out.
Rob walker (shooternz) would be a good place to start. Bullet casting though enjoyable is a whole new rabbit hole.