Stan, Briefly, Austin Hogan is a very astute student of double guns with an emphasis on Parkers. He is meticulous in his measurements of chambers, bores, chokes, etc. and can be completely trusted to relay any and all information he is able to discern from his examinations. He has graphed chambers, bores, and chokes on many, many guns and is very willing to share his findings. Mr. Hogan was invited to Julia's to examine the Czar's Parker just prior to it being auctioned a couple of years ago. Austin Hogan is also the editor-in-chief of Parker Pages, the quarterly journal (42 page glossy magazine) of the Parker Gun Collector's Association. . . and he's a very nice guy.
Dean