Bill, read my posts in the thread titled "Another New Member With A Question Or Two" and you will read where I state that 2 3/4" ammo in Parkers with chamber lengths of 2 9/16" or 2 5/8" is OK but in guns with 2 1/2" chambers it is best to use 2 1/2" ammo.
"Pinching" is nothing more than an indication that the end of the plastic shotshell has opened well into the narrow end of the forcing cone. It does not indicate a potentially dangerous situation and I don't believe I alluded to such.... But you knew that Bill.
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