Another thread got me to thinking about something. With all the worry about fiber wads sealing and keeping the gases behind the payload in the early days, the question arises in my mind again, as it has many times........... are plastic shot cup wads so much better at sealing that we can use ChamberMates, or any other chamber gauge reducing inserts, so that 20, 28, and yes, even .410 shot cups will seal the bore of a 12 ga. gun? Or, are those devices another gimmick foisted upon the shotgun oriented public? Not to be confused with full length tubes ...... ChamberMates, or Briley inserts, do not reduce the bore size, only the chamber and, maybe, the forcing cone.
