One of the lads on a small bore forum, has 3 stocked Savage actions.

He has 27 different barrels and chamberings that fit on those actions.
The bolts/actions are:

.222 ctg. bolt face, standard .470" bolt face, and magnum bolt face of .532".

Others have flat-faced Mauser action rings and have incorporated Savage-type locking nut for table-top barrel changes.

I've had 2 barrels for a CZ527 action for many years, chamberings: .17 Ack. Hornet on a CZ bl. that started out as a .17 Rem. and a tight neck .17 Rem. on a Pac-Nor barrel that started out as a .17AckHornet.