No luck on the build section and I know Marty and Tony hang here so my question is what are the thread dimensions on the chamber end of the barrel so I can screw the barrel extention on.  Interfrence fit?  Making a barrel for a 357 super mag rimless(have to turn each case rim down) and done the cases ,now need to thread the chamber end to attach the extention.  Thanks





Note: may have it figured out.  Went to my student machinist book and got thread depth (.6495/pitch 16) = .040 thread depth so figured out it is probably a 13/16-16tpi.  Will thread a scrap piece of steel and check fit.