Some of the problem are the state regulations. I went to build a gun for IL. I think Im legal now. I know IN, Mi , NY and others have lots of regulations on pistols.
Like has been said before. Most hunters dont want to practice that much. I know most of the rifle guys that hunt around here. Wont shoot 30 shots in 5 years. I know guys that still have the first box of shells they bought 10 years ago. They shoot one shot the day before season to make sure it is sighted in.