Squaring a receiver... I'll never do it again, okay, just once... To do a hunting rifle, I had my smith square up my old remington 308. He faced the front of the receiver, the face of the locking abutments, recut the threads (they were .080 out!), and trued up the back of the bolt lugs and bolt face. I now have a large-shank Remington 700 with a Hart barrel. I haven't told him yet, but this thing shoots bugholes when I can hold it down (recoil control can makes groups hard to shoot). Heck, I've even shot it during our monthly 600 yard F-class practice scoring a 99-4X for the 10 shots I got off before I decided to save the barrel (hunting barrels get warm - fast!). It also shoots my 110 V-max load into extrordinary precision - better than the rifle it was worked up on!
What didn't we do? We didn't change the bolt or even attempt to reduce the bolt clearance. We didn't bush the firing pin. We didn't put a match chamber in the barrel so I could go buy ammo if I came up short on a hunt, and we didn't spend but $250 doing it (that's for the receiver - barrel fitting was more). What I did do is wait quite a while (he's busy for a reason), pay shipping both ways, deal with all kinds of hassles from UPS, and wait some more.
If I was building a new rifle (instead of rebuilding one I already have) I'd be buying a custom, no question. There are some available for less than $950. I know where to get the action, and the barrel now, so I could have a barreled action in 3 weeks (I have a hobby gunsmith (benchrest guy) that just started his own business locally - he gives me a little quicker service because we're friends). That custon action has other advantages too.
As for bedding, I've bedded both Remington and Savage actions. They are both round bottomed, and about the same diameter. There is no difference there! Whoever you got that info from , especially if it is your gunsmith, I'd run (not walk) away from...