While I agree with Rossimp's suggestions for barrel diameter in his post above, JES will rebore as long as the resultant barrel has at least .100" wall thickness. IOW, to become a .338 the barrel has to be at least .538 in diameter. Even featherweight contours are about .550 so most any rifle with a 30-06 based (or smaller) chamber can become a 338-06 at JES.
But I do like the .620"-ish size myself.
Rex
