Well, Dean- here's the story. The owner of the pistol, a post 1976 mfg. gun- had the gun stolen from his home, with the std. .22 LR cylinder in it- but he had the .22Winchester Magnum cylinder stashed away- apparently he never used it. This was some years ago, he gave me the .22Magnum cylinder last week, in part payment for mounting and bore sighting a scope on his grandson's deer rifle.
I have no use for it- tried the Ruger Forums- strange, but because I have a hotmail address, I cannot register on the Rugerforum.com website- They have the Captcha system, but have you heard of any gun related sites that have been hit by spammers using a hotmail address? Is the PGCA "bullet-proof" from that nasty bit of internet crapola? Hope so.
Numrich lists them from $54.00 up to $135.00. I did find out the date, from a Ruger Collector I found on the Internet-- after 1976 and up to today, as the gun is still mfg., the cylinders for the .22Win Mag cal were NOT fluted- previous cylinders were fluted.
Thanks for the insight, Always nice to hear from an old friend. Good luck on grouse and woodcock and your love of the 16 gauge "Old Reliables" in those storied New England coverts. RWTF
