The magazine for .308 Win., 7mm-08, .260 Rem., and .243 Win. are the same. The brass is the same except these various calibers have different neck diameters. The bolt carrier group is the same. Depending on what weight grain bullet you use would dictate the barrel twist.
My brother has an AR-10 chambered in .243 Win. and it is quite accurate for what it is.
A good piece of glass is like a fine piece of ass. There is no known substitute known to man, and neither are cheap.
Last edited by mrm14; 12-12-2013 at 07:54 PM.