While the AR platform is fun to shoot, if you enjoy reloading the Thompson Center Contender and Encore platforms can be loads of fun.
Lots of wildcat case forming to play with. 357 Mag converts to 256 Win Mag. 30/30 converts to 30 Herrett, 357 Herrett, and 7-30 Waters. Tons of other fun conversions.
On the AR side, my two rigs are both SBR with suppressors. 300BLK and 9MM.