I agree Korney, the case walls are pushed out after seating the bullet, maybe as large as SAAMI spec. That was my point. Hence the visible bulge is usually normal. I do load bullets as large as .358 in 9mm, and they still chamber in every 9mm I tried them in even though the case mouth ends up exceeding SAAMI specifications by a couple thousandths. There seems to be a bit of error margin built into the specs either way even if they are supposedly for maximum cartridge. Anyway, what it proves is that your best case gauge is your pickiest barrel!
