I'm just getting into reloading again after many years and will be reloading 40 S&W and 9mm. My knowledge is dated so I'm doing a lot or research before spending any money.

One question I have concerns resizing of the brass. I've read that 40 S&W and 9 mm casings tend to bulge near the bottom. My question is do I need a separate sizing die or will the decapping die do an adequate job?