I haven't been shooting or reloading as long as some people on here, but I have had more Factory-ammo duds than my own handloads.

Most of the "dud" primers I've had in handloads I don't count as duds, because they happened while shooting double action with my .357, that revolver probably needs a new hammerspring. I've since switched from CCI to federal (which are softer) for my revolver loads and have had no issues.

I think I have had one dud .30-06 I loaded for my Garand, which I believe was a CCI standard large rifle primer.