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Given that the barrel was probably turned on a lathe between centers to get it from the blank OD (1.255 or so for many rifle barrel blanks) down to the final OD dimension, you're not going to see the barrel wobble unless you really spun it up in RPM - perhaps over 1,000 RPM for thinner barrels.
At that rotational speed, you're going to have to figure out how you indicate the runout... mechanical indicators will just vibrate pretty wildly, over-shooting on either end of the indicated range. Electronic indicators will not be able to display anything useful.
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