If given the choice I would always prefer to use a 9/16" thread on .30 cal instead of 1/2"-28. Partly for muzzle wall thickness, and partly to make sure a 223 suppressor or brake doesn't get installed on it by accident. Seems dumb, but people also try to chamber 300 Blk in 223, which is equally dumb IMO. Some real thin barrels require 1/2"-28, but I personally won't do it in any other situation.
One of the 9/16" threads (-24 or -28) is good to go on any bore size up to at least 358, and will fit most hunting rifle barrel profiles. If you can go bigger, that is even better.
Last edited by Yondering; 09/23/16.
