I saw a YouTube video on shotgun accessories where Velcro strips of shell holders are apparently becoming popular with competitive shotgunners. Multiple strips can be carried in a pouch to replace the holder on the gun as they get emptied.
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Well look at me unintentionally following the trend!
At about the 4:30 mark, he talks about the sidesaddle card system. I haven't tried it, though. I'm not in that tactical/competition sphere.