Re: How picky to get with new brass sorting
I'm picky in this area because I can't stand loaded cartridge runout. Just declaring that up front..
For you to measure, means you care about it, and your numbers look pretty typical to me.
For a very long and poorly designed case such as 30-06, runout from thickness variance grows seriously with each body cycle (firing/sizing). Trying to control runout here will only be a losing battle. And neck turning won't help at all.
I would use the 45 pieces exceeding 1thou variance, for brass prep setups only. Things like checks for trimmer, turner, uniforming, pilot deburring, chamfering, annealing, necksizing/tension, etc. Toss em in the trash after use, or immediately.
Keep and use the 1thou & under.
If you need more brass, buy twice as much more.
That's me though.