Shouldn't CZ 550 .243 and .380 stocks be drop-in interchangeable? Am in the market for a .243 target/someday son's deer rifle, and am really fond of attractive wood stocks. I found what i want in terms of wood, but it's a .308 (which is fine for now). But down the road, would like to swap the barrelled action with a .243 of the same 550 rifle. Thanks for your thoughts.