The trick is to only let it lightly rest in your shoulder do that it bounces back with the forward pressure of your front grip. Your trigger finger does not move, the rifle does.
In that video you can see when he does the .223 that it takes him another try to get the feel for the reciprocating action just right.
The fun wears off real quick if your wallet is like mine.
but feel free to post some video![UZI]
RR

