Winchester super X 1oz rifled foster shotgun slugs smooth bore (velocity and energy in discription)

Today, I test Winchester Super X 1oz rifled foster hollowpoint slugs in a single shot smooth bore shotgun. Our average velocity was 1,648 FPS and 2,638 FPE at the muzzle. with a 50 yard G1 calculated BC of 0.1 we achieve 1,499fps @ 25yds and 2,184 FPE. At 50yards we get 1,366fps and 1,814 FPE. Plenty to take on northern medium to large game.