I'm not telling you what to do as far as gunsmith goes, if it's a custom I would have a gunsmith check it over, and a chamber cast made. If it's factory I would shoot factory ammo first, I can think of zero reason to add reloads to proofing a new rifle purchase to any possible problems with the rifle, and reloads create a possible "it's your gun now" situation from the seller be it gun broker or many of the major manufactures.