bullet,
Haven't used either in copule years but I have 2 500's.One with modified vent rib smooth bore.The other has rifled slug barrel w/cantilever scope mount.I've shot a *****pot full of deer with both these guns.After years/decades foolin with various brands of slugs in both these guns,I've always ended up going back to the Federals.
I'd give them a try and then work up from there.Don't forget - make sure everything else;scope,sights,barrel is up tight,clean etc.. before yoo go out popppin off a 2-3-4 boxes of slugs.Gets expensive and hard on the shoulder!