Jim at Northland will help you figure out the caliber, twist, match chamber or standard chamber depending on what your going to do with the rifle. Very Helpful! Ordered a barrel a while back from Jim and waiting for shipment.
Fred at Sharp shooters supply is also very helpful if and when you can talk with them. They are super busy right now. I have three barrels from SSS and one trued action. No problems. 2 Douglas and 1 Brux.
ER Shaw is behind I here like everyone else. I bought a 22-250 AI from them some years ago and its been a great barrel.
Factory Savage barrels are mostly good. You just have to try them and see what they like.