12 ga 00 Buckshot Critical Defense® Features Reliable Functioning Specially loaded to ensure proper functioning in semi-auto and pump shotguns Consistent Performance Our Versatite™ wad technology delivers tight patterns every single time without modification to your gun. I have military issue 12 gauge 00 Buckshot, but.... Now that it's out I'll be getting a few boxes and keeping 8 loaded in my Remington 870P for home protection. It will be interesting if Hornady makes Critical Defense Slugs. What do you keep loaded in your 12ga. HD shotgun?