atblis

Regarding the Lee FCD, wouldn't I then effectively resizing the bullet too? When in doubt, start measuring (done with good calipers, not a mic so...) Bullet that set back under finger pressure measures 0.400" (as do several others) Wall thickness on offending R-P case measures ~0.011" (measured using tubing mic) Wall Thickness on other headstamps meaures 0.012"+ Loaded round measures 0.421" OD (the case that setback easily) Regular Lee die measures at 0.417" U Die measures 0.413" M die expander measures at 0.498" Case sized in regular Lee die measures 0.420" OD I think it's R-P cases that are the problem. Doing a little more reading on the internet, there's a good bit of bitching about the R-P cases. It sounds like they get a little work hardened after a couple loadings and lose neck tension (being on the thin size contributes). I am surprised they spring back that much. Hmm, don't want to sort my brass. ~Half are R-P cases.

I have a bunch of 40 S&W brass to reload and much of it is R-P with rather thin case walls. Just thin enough that my Lee sizing doesn't get it tight enough to have sufficient bullet tension and I get set back. Verified this on the setback rounds with a tubing micrometer. Yep, they're thinner than everything else. No other brass does this to me (and not even all R-P cases). So I got a Lee U die, but it's too tight IMO. I really just need 0.001" to 0.002" tighter than my current die. It's possible my die is on the large size tolerance-wise. But before I start rolling the dice on new dies, are there any manufacturers known for being a little on the tight side for their pistol dies?