I crimp my tube feed lever-actions and revolver cartridges. For the handguns, only crimp enough to keep bullet from pulling. No crimp on any Savage 99, Browning BLR, Marlin 62, bolt-guns or my Garand. For hunting rounds in these rifles or auto pistols I will just remove the flare, taper crimp or just enough crimp to smooth the bullet to case mouth for smooth feed. If chamber has a nicely beveled edge I don't bother with the flare, using 'M' style expanders. I try to avoid powders that require heavy crimp to burn properly.