My brother has the 12FV in 22-250 which is pretty darn close to the 223. He is using a two piece mount on his with a Burris MTAC 30mm tube. That scope is long enough to allow him to set his eye box up correctly. It is a blind magazine and loads 4 rounds total from the top, just like the old Winchester rifles did (and may still for all I know). We usually wind up single loading rounds in the PD fields after the initial loading of the mag, and have no problem in doing so.
Barrel breakin: I'm a believer that you should shoot one round and clean(x5) and then 5 rounds and clean(x5)... After that I figure it's good to go. Others may have a different theory.
Boyd's Stock: Those are usually determined by short or long action and action screw spacing... As long as those 2 things are identical between the rifles you are wanting to swap back and forth on, it should be an option. However, I would not do that myself, the stocks usually require you to pillar bed at the least and often times a glass bedding job as well. There lies the problem with swapping back and forth, no two rifles are identical and will need to have their own "custom fit".
As far as a different caliber... that is up to you, and what you might want to use it for. 223 can reach out past 200 yards for sure, but doesn't carry much down range energy... Prairie dogs, ground hogs, ground squirrels, rabbits are what you would be shooting at that distance. you want something big enough for deer @ 200 yards, take a look at a .243 (6mm)...
Good luck to you,
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