I sweep up my area at my local range...and pickup whatever is around from shooters that say they don't want to keep it. I probably pick up 20 lbs of brass a week...80% is 9mm.. 10% is .45 acp ...5% is .40 S&W...( the remainder is .38 spl , or odd ball calibers..)...
I reload and shoot at least 25,000 rds a year in handguns ...mostly 9mm.../ after I clean the brass, I inspect it ..sort out anything that is really old, bent, or doesn't look ok.../ ...and I recycle all brass from AMERC, S&B, Maxxtech...and anything that didn't clean up pretty well, or there is a lot of crud around the primer pocket or I can't read the head stamp..I recycle it. I have not bought any brass, even for revolvers in .357 mag or .44 mag...in at least 25 yrs...
I always fully resize a case ...never just neck size. In low velocity calibers like .45 acp with very thick cases, load them until they crack.
In calibers like .40 S&W...high velocity, higher pressure...I inspect them very closely.
In 9mm...I just clean, inspect...load them until they crack...