We used a bore gauge recently -- a rod about 1/2 lenght of normal barrels, with three contact balls at 120 degree intervals, a dial micrometer and a distance scale in cm and inches on side. With it we could see the start and end of the forcing cone and the ID of the barrel for about 1/2 its lenght. When inserted from other end we could see the profile and lenghts of chokes, as well as the IDs of the upper 1/2 of the bore. A really wonderful tool!!
It belongs to a friend, don't know the maker or cost. He used to be an avid trap and skeet shooter, hence the bore gauge.
FYI, the chambers on my Husqvarna M48 are too tapered for his chamber gauge, with the gauge indicating they are only about 50 mm instead of the correct 65 mm. The chamber gauge fit nicely into the chambers of two M51s.
Niklas
Last edited by NiklasP; 11/06/06 03:39 PM.
