When I was shooting and loading more than I've been in the past few years, every time I got a new batch of handgun brass I'd go through and trim all the cases to a uniform length and just take off the burr, no chamfer to speak of. For revolvers, so my crimp would be consistently located half-way up the cannelure and of consistent "pull." For autopistols so I would get a consistent amount of taper crimp and so the headspace relationship between my loads and the chamber were consistent. Maybe it helped, maybe not, but it's what I did.
