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I shot two beads on a vent rib barrel for a while, and the barrel shot to point of aim and I killed turkey's with it consistently. But I still had to be very conscious about looking down the barrel, and not over the beads. And I was fortunate that that old school, fixed choke barrel shot to point of aim. It's when the guns do not shoot to POA that the advantages of adjustable sights come to surface.
I'm not going to argue that a good gun doesn't deserve a good optic, that is certainly true. But I've got a safe full of blue collar Leupolds and Burris's, most bought used for right around $200 bucks, that are giving more than adequate service, and have for years. But we are on shotgun's right, so to stay on track.....
It's anybody's money, and if one wants to drop big bucks on a sight system for their turkey gun, near $100 bucks on a tube, and $8-10 a shell, more power to'em. And dot sights are durable enough now, the good ones, that some deserve consideration. Many folks are accustomed to them too...., and I have begun to at least glance at them as my eyes and depth of focus slide past age 56 now, and traditional blade and bead sights are a bit hazy. So wvcolt.....good luck to you, hope you kill a big'n...but we aren't going to be hunting the same gear.
But....gobbler hunting is essentially a short range game and the shotguns we hunt with in the spring are short range weapons. There have been many attempts and developments to extend the range of our turkey guns, and we have gained a bit.....but to me, the price we pay for 10-15 more yds, at best, is just not worth it. Once the leaves come out, seems difficult to see past 50 yds or so in the turkey woods anyhow. For me, the Rem factory bead and blade rifle/slug sights are all I want, and on the 835 I've recently started hunting, a similar pair of tru-glo fiber optics. The FO's are not as tough, and I have to watch my gun handling a bit more than I'd like, but I can really see them.
I will say that the birds I have lost shot/at (not too many mind you) have all been either because I pitifully under estimated the range (like by 20 yds!!!!all those on open country ROW set ups,) or, I blew a sapling up right off the muzzle I did not see. I don't think space shot would have helped collect the birds at all. It wasn't a gun/load fail, I failed.
Finally, on a Moss 500, at one time, Mossberg offered the guns with factory PEEP sights, winged and very rugged looking. At least I handled one so equipped. I noticed that , Brownells stocked such a sight set up for the Mossbergs too. Had a blaze orange metal front blade, ghost ring rear. MIght be more than one would be willing to pay for turkey sights, but I really liked the look of that rig. Likely required a drill and tap for install on an early 500.
Longer than I intended.......but I do love gobbler hunting.