I load centerfire rifle for 25-06 and 300 Win Mag. I have bolt action rifles and don’t crimp. I am starting to load 357 Mag pistol bullets. Is it necessary to flare the case mouth? With rifle I usually have boat-tail bullets with cooper cladding, friction bullet seating is fine. If loading lead flat-based pistol bullets, I can see how getting bullet into case rim might shave bullet without flaring. If loading FMJ bullets is flaring still required. And if shooting in a revolver is crimping required for pistol? I have a Pacific Durachrome 3 die set for straight wall cases with 3 different seater plugs. I bought this die set 30 years ago and loaded 1 box of ammo and started buying factory ammo after that. I recall using the flare die but now I can’t remember why or if required. Thanks much, new again to pistol reloading.