Take a look at these prototype 12 gauge Link Slugs made in the Northwest. These are very heavy slugs and are still under development. Since no high speed camera tests have been done yet, Taofledermaus had the pleasure of doing that. These shells were pre-loaded.
The heavy hitter slug weighs in at 1.53 oz, this baby moves at 1300 feet per seconds. Means it will deliver 2518 ft/lbs of kinetic energy. (knock down power) Have a look.
TAOFLEDERMAUS is famous for going the extra mile when testing out some of the wildest and weirdest experimental ammo, and making great videos with high-speed cameras.
Sources: Taofledermaus, Links Slugs, Jerry Linquist