I don't think it would.
Turkey loads are usually steel shot,and buck shot are lead(which are softer and squash down going out) the back pressure due to this might be dangerous, but you said he shot a few loads with it in there.The only problem that I can see
would be spreading out the choke(from the inside)and not being able to get the choke out.
So other than that, I bet it felt like a jackhammer!!
