I agree that BowhunterNJ summed it up really well.
I have heard a lot of people say that if you have an extremely tight pattern, for reaching way out, you should consider a rear sight, or a red dot. If you get a bird in at 15 yards or less, it can turn into a miss with those super tight patterns when you have birds up close and personal.
That makes sense to me....but I've almost always used a bow, so I've only shot a handful of birds with guns, and all the ones with the gun have been with a 28" vent rib standard bead and were less than about 25 yards. I don't strive for super tight patterns out to 50 yards. I feel like you either bring them in, or you let them gobble another day. Most of the guys I've had out with me just use a bead too, but I can think of two guys that have used red dot scopes. I don't recall anyone missing with either type. All shots have been like 30ish yards tops, most are much closer.... I've never hunted with anyone using magnification, but I have heard of people using low power scopes.
I will personally stick with a bead but can definitely see using a red-dot, reflex style, etc..Especially if you shoot a super tight pattern.