a while back i took my garand to a very compitent gunsmith to have my s.a. 48 barrel re-crowned cause the muzzle had obvious uneven wear at the end. i asked if he could re crown the muzzle but retain the factory contour of the muzzle and he explained that he didnt have the proper crowning tool but he could put the crown on the inside and he would drill down 1 tenth of an inch and that would correct every thing and i have to say he did an excellent job. some time passed and i decided to get a muzzle gauge looked online and got one from a person whos name im not gonna mention but hes supposed to be THE guru of the garands anyway,when i got the gauge i immediatly checked my newly crowned muzzle and it gauged a 3 i thought this cant be right so i emailed him and he responded that his gauges are accurate and has a return policy if i choose to go that route i took him for his word and kept the gauge and then decided to do some more in depth measuring this is what i found... the gauge is encrimented in 1/8ths not 1/10ths i used a fine tipped marker to make a mark on the gauge subtracted 1/10th to compensate for the re crown and the new mark was just above the "2" on the gauge i then used my caliper gauge and got a reading of 3015 or 1.5 im happy and frustrated at the same time cause i thought the barrel was still a paper weight but now i know its still a good shooter. sooner or later ill get a more accurate gauge but if anyone has doubts about their muzzle gauge pull out that marker and caliper and GAUGE the muzzle gauge to see if its accurate