I think the biggest downside to using Savage actions for building rifles is the magazine issues.
Even after buying the proper magazine parts to go from one cartridge to another there can and probably will be issues.
My experience became so frustrating that i bought another gun in 300 WSM.
Ill solve it i thought, ill just swap my new barrel over to this gun.
Thats when i discovered ( short shank/long shank. lol.
There are more build friendly actions out there, especially when going from a non magnum to a magnum cartridge.