Either pinning or free recoil, Jim. Just push it back and watch. Those stocks track extremely well.
You must be fast with no draft in the stock, it very tuff some days, and with less than 3/4 of a second to do it at 600. Now with the big 300's with brakes with in two feet of you that will move you out of scoring rings it even makes it even harder. If it is wet the little bullets don't make much of a splash it nearly impossible..... I guess you have to rely on a guy with a spotting scope..... jim