What is involved in “slugging” the barrel?
I’d be overjoyed if my .44 could achieve that!
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Big Al52 pretty well described slugging. For a .44 I use a 3/8" hardwood dowel and spin the last inch on both ends in sandpaper until a fired 9mm case can be slipped on. (40 S&W works on a .45) I slug from the breech end and with the Henry's the toughest part is getting it started because the transition from chamber to rifling is very abrupt. Make sure the bore is well oiled.
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So you are ramming a 9mm case downr your barrel? That doesn’t sound like a wise practice. What is the point of it? Forgive my ignorance on the practice, but I’ve never had any reason to look into it before.