I've been having all sorts of trouble getting a myriad of bullets to chamber reliably in my Mini-14 300 Blackout. This has gotten me interested in looking at the dimensions of the chamber. It's hard to see from this picture, but it seems to me there is practically no leade into the rifling. I wish I could get a better picture but picture is as good as I think I can do.
Does this look normal to you guys?
By the way, I know there is some confusion about the term but by leade I mean the part of the rifling that gradually ramps up from "freebore" to the full rifling depth.