OK, from what I understand via e-mail this is the goal...
I want to go from a 223 to a cal that can hunt with in Tn,. 223 is not legal. I picked up a extra Varmiter upper without the bolt or bolt carrier but I dont need 2. So I would like to put this on my personal Varmiter and use my bolt and bolt carrier if this is poss. I guess I want to rebarrel the 223 to a 6mm or 7mm I shoot alot of 7mm TCU in my Encore. Would this be about the same?
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With what was e-mailed it will be much easier for you to do this in other ways. Personally, I would give up on the 243 option and either go with the AR-10 or look at the AR-15 in either 7.62x39 or 300 Whisper ([url]http://www.quarterbore.com/300whipser[/url])
The 300 Whisper will be the easiest option as it uses AR-15 mags, bolt, and everything else and the 300 Whipser is a great hunting cartridge that will do a good job on deer. The 300 Whisper will nearly equal the perfomance of the 30/30 or 7.62x39...
Good Lucn, but doing what you want to do with an AR-15 is going to cost you a whole lot of money and there are other cartrdges that will be easier to do the same thing with...
Good Luck!