I purchased an Axis in .243 Winchester for my .450 Bushmaster build. All is fine with the rifle and it shoots better than I ever expected. Rounds feed fine from the 243 mag but I don't like all the extra room in the front of the mag allowing the rounds to jump forward under recoil. As I don't own any other Axis rifles, was curious if the 223 has the same dimensions externally. Will it snap in and lock into a 243 stock? If so, will it feed 450 Bushmasters? Anybody done this?