I feel you guys. To be honest he's pushing it a little with him being 6 and only 50lbs. Hell, he still has trouble getting his shoulder on the butt and hand to the trigger of most rifles.
. But when the boy shows interest and says he wants to shoot a deer, it's up to dad to give him the opportunity.
The 9mm just fits him so well. I set up a bunch of storage totes from 20 to 30 yards earlier. They're about the size of a deer from bottom to back so they worked well. I had him use the bipod to maneuver the weapon around from tote to tote. When he got the halo and dot in the center he pulled the trigger on a snap cap then let go and let me see. He was able to move it around and get it centered on different totes every time.
@JOHNROHIO I was looking at cast bullets per your recommendation. Buffalo Bore makes one that's 147gr hard cast flat nose and touts great penetration. It has 360ftlbs of muzzle energy. I was reading some articles about hunting with a 9mm and it mentioned for heavier game like hogs and protection against bears to go with a hard cast. For deer etc it mentioned Underwood Xtreme defender. A solid copper 90gr +P round that touts 390 ft lbs of muzzle energy and mushrooms. The big difference is an added 300fps in the lighter but solid copper round. I don't know shit about shit but I think that should be ok. These southern deer are very thin skinned, light coats, and not a ton of fat, broadside through the ribs at 30 shoild be more than enough.