Hello all,

so it is well known that we can use a 30.06 M2 ball to check muzzle wear but I'm not sure how that works. I read somewhere that the carbine ball is too short to be used for this purpose but since the 30.06 is also a .30 caliber bullet, shouldn't it fall into the muzzle all the way to the bullet shoulder? I guess what I dont understand is the physics behind what happens to the bullet as it is fired into the barrel. Are .30 caliber bullets slightly larger than the bore before fired and once they are fired they deform (elongate) in the barrel?

thanks
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