The Savage 25 is a cheap gun. Doubt you could ever wear out the barrel unless you shot P-dogs for a living. Even then your ammo expenses would be 20X the cost of a new rifle.
IF it is pressed and pinned in you could STILL replace it by drilling out the 3/4 of the old bbl, threading whats left and fitting a new bbl. This is the way K31s are done and it works just great.
Yes the Savage 1919, 1921, M19 and M23 all have one piece receiver bbl units. Again can be rebbled (see above), rebored or relined.
As with the 25, the prize may not be worth the quest unless it is a special rifle or you are attached to it.
FYI, lots of 22RF bbls are pressed/pinned in.