As the others said, putting it in the chamber would not be productive. The center of the chamber is not necessarily where the pattern center will go. Putting one in the muzzle, assuming it was a snug fit in the parallel section of the choke might be somewhat useful. I built an O/U muzzle loader and regulated the barrels with one. They were Cyl/cyl and the barrels shot to the same POI afterward. I would not trust anything but shooting at a pattern board or plate, for proper fitting of a stock.
I'll repeat the procedure, in case snyone tuned it late: Fire shots, at least three, at a measured 16 yards. Mount the gun quickly and fire, without aiming or adjusting your mount. Shoot as soon as the gun is properly mounted, when it touches your cheek(having a consistent mount is an absolute pre-requisite for this). Measure how far away the pattern center is from the target aiming point. (Aiming point is not a good choice of words, as you don't aim). For each 1" the pattern center is off, the comb needs to be changed about 1/16". Move the comb the way the pattern needs to go. Shoots low=higher comb, shooting high needs lower comb, shooting left needs comb to the right, etc.
Last edited by Jim Legg; 02/07/07 11:47 PM.
