I would like to make my own head space GO,NO-GO & FIELD gauges for my MOSIN NAGANT M44. Does anyone know what the tolerances should be or where I can get those dimentions? I have my own lathe,mill and drill press, so making them should be no problem. Buying these gages would cost MORE than I paid for the rifle,besides I like making things. I have found the dimentions for the 7.62 x 54r cartridge and the rim thickness is listed as .055 in one site and .064 in another site. I will have to sort this out. My plan would be, at this point, to make disc type gauges as apposed to slug type gauges.