I have several ported guns - and one I have shot at trap for several decades. There is no sign of anything.
By the way - "Porting" and "Pitting" are TWO entirely DIFFERENT issues. Ports do NOT constrain pressure, but rather deflect pressure to the advantage of the shooter. Pitting tries to CONSTRAIN - but given PRESSURE - could erupt the barrel when pressure is at it's peak - i.e. and n.b. - which is not the the advantage of the shooter, should he/she be missing a few fingers when the pressure is more than than the barrel wall thickness might provide...
Porting and pitting - again - are two very different issues with two totally two different effects and outcomes.
John
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