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Plus same barrel length and contour.I'd use the same action and chassis my main rifle uses.
I'm in the middle of a .223 build. Although not a "trainer" per se, I think my answers are applicable.
I'm going with a R700 that I will be truing myself. Rock Creek barrel, McMillan stock. I went straight .223 after considering the Ackley. I did so for simplicity's sake. I want, at this point in my life and shooting, easy. I will be shooting FT/R with it this summer a few times. I'm looking forward to that.
Good luck in whatever you choose.