http://www.alloutdoor.com/2016/01/14/oath-expanding-fragmenting-slugs/ 12ga slugs have been rightly known as good stoppers on dangerous game, but tend to over-penetrate in hominids. OATH Ammunition has two new designs that solve over-penetration along with greatly improving reliability in box-fed shotguns. Above is their 1.25oz 1600fps all-copper slug designed to expand to an incredible 2.5″ and penetrate just enough to punch through a hostile human with little energy left to harm anyone downrange. If you’ve ever heard the expression: “a hole big enough to toss a cat through,” consider that cats can fit any opening larger than their heads, and smaller breeds have heads under 2.5″ in circumference. The copper or aluminum expander die visible in the middle ensures reliable opening even through heavy clothing. The die itself penetrates deeper than the expanded slug. The frangible slug is enormously heavy at 2.25oz but slower–1200fps–so that the muzzle energy of the two loads is similar at 3100ft-lbs. Upon impact, this all-brass (except for the 40 grain copper expander die) projectile breaks up into half-dozen 158 grain sharp triangular pieces, each spreading about 15 degrees to the side of the initial direction. Penetration is likewise limited to the depth of a rib cage, producing very good stopping effect without over penetration.