Miller has reminded us of something brought up by an earlier poster (I think) who brought up some pressure figures involving loose versus tight crimps. The pressure differences between the two are more than we would have thought. Miller further mentioned the consequence (tighter crimps) of running a crimped shell into the forcing cone. I, personally, take Sherman Bell's testing only to the point he tested, in other words, 2 3/4" shells in 2 1/2" chambers. I'm not worried about putting 3" shells in 2 1/2" chambers because I'm just not going to do it. Let's face it, only about one in a hundred of us has a reloader set up for 3" shells and the factory shells are too off the scale for use in bird guns.
