3006 M2 Ball Cartridge as a Gage for Carbine
The post that just went locked the poster asked for a way to check a M1 carbine barrel with out a gage. I have read and seen a complete work up of the M2 Ball round and a ME gage so someone with out a gage could check their carbine. He Took the M2 bullet-cartridge all the way down to the lowest numbers of the ME gage. It does not make any difference what the diameter of the 3006 is compaired to the .30 carbine, it is getting a rough tool for someone who has no gage. If you slide the 3006 bullet, cartridge in the carbine barrel and there is a quarter inch between the case mouth and the muzzle you have a good barrel, if you put the cartridge in and it goes all the way to the case mouth the barrel is shot out.