There's lots of good information here (some of which I don't particularly agree with, but that's okay.) But one thing that should be pointed out and not missed is that it's poor technique at the bench to build that many of ANYTHING when the first couple haven't been checked.
80-some odd rounds doesn't sound like a zillion... but with .480 Ruger, it probably costs like a zillion!
I often take a handgun down to the bench when I'm setting up a new bullet or a new load. Chamber check for SURE. Not each round, but certainly the first 5 or 10 and then some random ones from the box of loaded ammo.
I don't like taking 80+ rounds to the range to find that they don't fit.