FtFeed... almost always with non CCI/Fiocchi .22 ammo, though it has happened on days when my crushed hand just isn't gripping well on the larger Semi automatics. Or teaching newcomers who haven't gotten out of limpwristing.
FTFire/Squibs... Never had a primer fail in the handloads, although I've had a few squibs when pushing the lower end of the envelope with my own handloads while making super-low recoil rounds for kids and fearful newcomers.
A ton of squib loads the one time I took leave of my senses and bought handloads at a gun show before starting to reload myself. Never again.