A 22 is a great gun for practicing form . Your grip ,grip pressure, sight alignment,trigger control breathing and follow thru are all easier to work on without recoil and noise.To get better with open sights you have to work on all of the above. 22 shells are available again and can be found relatively cheaply .04 to .05 cents per round so stock up when you can.TO BE GOOD WITH THE BIG BORES WITH OPEN SIGHTS YOU HAVE TO SHOOT THE BIG BORES WITH OPEN SIGHTS. but you need the good form first.
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junebug