Why shoot flint?
Lots of great answers arrived here ahead of me, but being a blabber mouth I’ll try anyway. Beautiful weapons aside, add the history, nostalgia, expanded hunting seasons (in enlightened states), challenging yet reliable. (Thanks JHansen, been there, done that!)
Maybe I’m being silly, but I’ve never been fully comfortable with a cap gun, either while loading by hand or using a capper. I’ve never had, seen, nor heard of an incident where a cap hurt anyone but it’s always in the back of my mind. I’ve not used a capper since the late ”˜70’s, clumsiest tool I’d ever had in my hands; maybe they are better now, I dunno. And I never cared for that little rattle can in my pocket. If I can hear it, I just know anything with hairier ears than mine”¦
Flints add a couple of more tools to the bag, and add basic mineralogy to every outing. Constantly looking for pyrotechnic flints & grading them. Just another skill for the pioneering arsenal.