Shooting slugs from a smooth bore barrel I noticed a strange thing. We are talking about Federal Tru-Ball Rilled Slugs in a smooth 18 inch and 14 inch barrel. This is a Remington 870. When using a 14 inch barrel the slugs will rise 12 to 14 inches above point of aim at 50 yards compared to the 18 inch barrel. The only difference being barrel length. I haven’t tried any other brand of slug and several other people think this may be unique to the Federal. Any comments and insights would be welcome. Both barrel lengths give 6 to 8 inch groups , 50 yards kneeling position.