Question for the group: I've heard it suggested that the A-Zoom caps (which I like) are a good choice because they have a plastic insert for the primer. Other brands have metal primer inserts. If you whack those metal primers (obviously harder than real primers) enough times, is there any concern about breaking strikers? I spoke with one professional in the gun business who reported some striker breakage in good quality Spanish doubles, which he put down to snappies with metal primers. Comments??