I have fired a good flintlock rifle, on one occasion, but it didn't belong to me. Mine have all been cheap kits and toys which lack any sort of sophisticated tuning, hence annoying length of lock time. The advice always given me is "time is money" in that regard, and my interest was never strong enough to devote what was needed for really fast setups, particularly since percussion caps used to be a lot cheaper than flints and 4F pan powder. I did go on a few hunts with my .45 Kentucky percussion rifle, but the fox squirrels in the oaks and pecan trees around here seem to react to the flash before the ball can make it to them.
Generally when I hunt squirrels it's as much for the pot as it is for the sport, so I don't deliberately handicap the operation. Deer I hunt primarily for the meat. Pigs and ranch varmints are what I prefer for sport shooting, the elegant game animals seeming to me a little more majestic and rare each year, probably one day I will stop hunting deer and doves altogether in my immediate area unless they become over-abundant as they used to be.