04-07-2014, 01:36 AM
nincomp Wrote:I do not know if anyone is confused by the PTG reamer drawing, but the print uses different nomenclature than most of us on the site. We refer to a compound throat. The print calls the first part of the compound throat the "lead." What can be confusing to those making chamber casts is that the rifling can be seen well before the end of this "lead."Another subtlety about the PTG drawing is that it specifies SAAMI diameters with a + and - tolerance while the SAAMI spec has the minimum diameter the line and the maximum diameter .002" larger. That means that a reamer cut to the PTG drawing has the potential of being a bit tight.