Have been loading .40 for years on my Dillon 550. Recently got a new tool head, powder measure and dies for 9mm. The issue I'm having is resizing and cartridge fitting in chamber. Went through a bunch of used brass and when i size them in the first station (decapping) they go into chamber no problem. Bell, seat and crimp no problem. Issue is, and I'm using a barrel from walther p99 and glock they don't go in and out of the chamber easily the same way factory ammo does and are pretty snug. Tried a few on a sig and they fall right in and out no problem. I'm trying to understand how the case is swelling near the rim and causing fitment issues. I realize a sizing gauge would be the way to go but I've always used a barrel to check my loads. I even loaded some without powder to make sure nothing was getting compressed? I think they would work but don't want to take any risks. Am I over thinking it ? Any ideas are appreciated, I hope I explained with enough detail. Thanks in advance.