In an older thread on how to tell if your bore is worn Harlan said this:
"The bullet tip for an M1icon carbine is short and round, so it doesn’t work very well because the relative differences in muzzle size is hard to see. (Even on a new barrel, the muzzle is very close to the front of the shell casing) "

Since I have nothing else to test with I took a pic of what the .30 cal round looks like out of curiosity. Based on the pic do you guys think I might be able to hit the broad side of a barn when I get to the range? (If it will ever stop raining.)

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