I have a mod 11 .223 xp. Looking to change out to a 308. I wanna do a check list.....

1. Barrel
2. Barrel tools (barrel wrench, etc.)
3. Bolt head.
4. New 308 mag.
5. Ammo.

I have the new style everything on this gun. In the word new, I mean axis...... hollow BAS. Axis mag. Probably an axis style trigger. But my release is on the action not in triggerguard.

Will I need something special for the bolt head if I have the hollow BAS?

Also the mag, will it be the same bottom for a 308 to a 223? I'm assuming they are both SA and the mag itself will be a little different but the bottom carrier is the same.....