Agreed.? 1 yes some times depending on the gun. I had one that loved Remmington Subsonics and another that would not cycle them at all.
?2 Yes out to 50 yards; it mostly depends upon your eyesite and wither or not you grew up shooting Iron Sites. :Blasting_
I used to outshoot many a friend with iron sights, but that was 20 years ago. I was using a 40 year old single shot Winchester, and they had newer fancier stuff.