hello & happy holidays to all a friend of mine gave me a couple of boxes of brenneke slugs. there rottweil goldenslugs 3in magnums in 1&3/8 oz for 12 guage . picture on box looks like there rifled, but says there for rifled barrels only. does anyone know about these ? are they ok to shoot in rifled barrel? i bet they have some nice recoil. thanks billd