I have had precious few duds in my lifetime of shotgunning. It's been so long since I had one I cannot even remember when it was. I shoot mostly Estate, RIO and Fiocchi brands nowadays. Quality is excellent on them all.
Something that was very interesting to me was that when you go to Argentina to hunt, you shoot Argentine shells, manufactured in country. Last time I was there my shell count was around 5200. Not one misfire. These boxes may look cartoonish, but they contained high quality ammo.

SRH