Beretta did get the memo. I have a Brit market 682 "Sporting" that has factory screw-ins and ports. I got it NIB so I'm pretty sure the factory did the ports. I don't recall that Perazzi did any ports but they are into bigger bores and have had long cones prolly before anyone noticed. That "shoot harder" crap is always fun to hear. What a yuk!
As to the forcing cones - The initial pressure impulse has to be lower and resultant shot deformation lower with longer cones. Is it lower enough to make a difference? How long is long enough? there were "chamberless" guns a century ago. If that is so great why do we still have forcing cones and 12ga bores? I dunno. But I do know that Julius Del George had a Pigeon factory engraved M12 that flat kicked like a MFer until he noticed that it had no visible cone at all. So he had that taken care of and guess what - his $200 purchase instantly increased several fold.
However opening the cones in old gun has a dangerous potential - the barrel thickness may be inadequate to tolerate that bigger ID that the long cone creates. If it gets sent for re-proof it could easily come back in a couple pieces.
Like most of the BS that floats on this and other gun sites, empirical evidence is non-existent for forcing cones, big bores, ports, and a multitude of other "topics of interest". Those are all things that, to my shame, I have participated in with past guns. Abstinence, just like the Repugnicans say, is the best policy and one that I presently endorse.
For guns anyway.
Dr.WtS
