Well, a rifled choke tube is supposed to give a slug some spin to make it more accurate. However, I have found that it's a bunch of hype.
From my smooth bore Ithaca 37 with a 26" barrel, I can keep the slugs (Winchester Super X) on a 9" paper plate at 75 yards.
That would drop any deer I have ever seen!
At 100 yards - I'm about 10" group - still acceptable.
I had a Remington that I put a rfled choke tube in - tried several different types of slugs - could not do better than my smooth bore.
Regarding steel shot, I do not use the stuff since I do not hunt ducks or birds.
"The Lord is a warrior, the Lord is his name." Exodus15:3