A proper go gauge should have an extension on it for centering the rim dimension in the barrel and on the bolt face. There are places that rent reamers and probably the gauges as well.
Did you have an issue closing on new unfired cases? If not almost closing on the .0655 gauge would indicate you should have no issue with Graf's cases.
BR suggested trying a "known" good bolt in your rifle, also trying your bolt with a new unfired case in a "known" good rifle would tell you something. Leave your bolt stripped so you do not get them mixed up. I have 2 Krags and had both bolts on the table at the same time. Took a lot of examination to put them straight and I am not 100% sure that I really did.