mr.frosty,
The Foster Slugs such as Remington, Federal, Winchester and Brenneke that have rifling on the sides will be fine in a full choke. The rifling is designed to swage down when going through the choke and will shoot well in full, modified and improved cylinder bores. My father has shot more deer than I can remember through a 16ga full choked barrel with Foster Slugs since the late 1940's without any problems with his choke. I have shot hundreds of slugs through a modified choked 12ga.
Of course a IC or rifled barrel is more desirable for slug shooting, but millions of deer have been shot with Foster Slugs through full choked shotguns and they aren't complaining.