For several years my godson and I would meet up in Buffalo,WY with my friend and his two sons (all same or year apart) then shoot at a ranch about 35mi east of there. We used .223, .204, .22 mag, 224 TTH, 6mm Rem, 17 HMR. I made sure everyone did not shoot too fast, swapped out rifles, etc. Even doing that, one kid shot my custom 6mm a bit too fast and fire checked a bit of the throat. I sold that rifle before it lost accuracy, felt it was way too big for what we were doing. We never shot past 400yds, the 223 and 204 were great for that. Lots of fun though, watching those teens enjoying themselves!