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Have you kept the barnes targets you shot? The shape of the holes can be quite diagnostic. If not shoot one at a target at 100 then one at another at 150 or 200 and look at the holes. If they are not...

Nothing wrong with the 223 at all, the 63 sierra or winchester are excellent bullets if you feel you need a heavy bullet. I used to use them but found the 55 gr did as well and was better for smaller...

Most guys myself included find 2206h to be about the best in the 223, but 2208 is good too as you have discovered. The barnes are weird little things that may be too long to have stableise in a 12...