Where did he say anything about using slugs? When I hunt hogs with a shotgun it is because I just may have to wade in amongst them. Buckshot is the proper load here. Full choke may (or may not) be a bit tight for best patterning with them, only testing can tell that, but I can guarantee there won't be any holes in the pattern a hog can get through. I don't know how they are hunted in Callyforny, but trying to use a rifle or slugs on hogs in some situations here will get you acquainted with the local emergency room tailor, quick.
It also is not a given that steel will ruin a set of full choked barrels. Granted, it is not wise to use steel in something that tight. Patterns usually suffer, and there is a greater risk of shot bridging causing damage to the choke area, but it is not guaranteed like some would have you believe.
SRH
