You wanted an update and I gave it. Way Late, I know, but like I said, I got busy actually hunting.
The rifle wouldn’t eject when I sent it off, and it ejects exactly as it’s supposed to now. It’s the same bolt (same 803 inscribed on the underside of the bolt handle), and the extractor looks the same. But the techs did something to it (cleaned it, replaced a spring, I don’t know). Whatever they did, it works and I’m happy with it now.
Nothing I say is going to make you believe me and that’s fine, I suppose. I think I could ship some of you my rifle for free and you still wouldn’t believe I own a Vanguard or that it had problems. But instead of being so paranoid on here, I’d suggest believing a guy who has a question. Another responder to this thread said he had a 257 Vanguard that did the same thing, so it’s not like I’m just making something up for responses or whatever would be gained by being a troll.