Here's a few tips to keep in mind when making a choke selection.

-Steel shot patterns tighter than lead in most standard chokes. If you're shooting steel out of choke that came with the gun, steel will pattern like one constriction smaller than the tube is marked. C/IC = M, M = F*

-Do not shoot steel shot out of a choke marked Full (or tighter)
A friend of a friend sky busted on some snows with a turkey choke in his Mossy 835...I heard it described as a catastrophic bulging event.

-When shooting heavier-than-lead loads out of specially made chokes the traditional steel-lead advice changes.

*It's not an exact conversion, but helpful to understand.