Well OK, I can go along with the above and will try to quit having evil thoughts about those who chamfer. Handgun brass usually doesn't need much attention as pointed out. Other than flaring on a progressive, the only other thing I did one time with handgun brass was to run a batch of .45 cases lightly through the trimmer just for the purpose of squaring up the case mouths. Rifle brass, when flaring is needed, always gets the M die treatment. Let's say that if you have six different 30 caliber rifles, you may be able to get by with just one M die if willing to readjustment it between the various length brass (.308, .30-06, .30 mags, etc). At about $20 each with shipping and NRA roundup, usually no need for more than one. Flaring rifle brass as needed is usually just restricted to using cast bullets.