I am neck sizing for my ar57
oops, so sorry - I sold my AR57 upper, 5 mags and 2K+ of ammo last year, for while it shot great at 50 yards - it sucked at 100 and did well to put 5 rounds in 5"; and properly scoping that thing was dang near impossible (I ran a red-dot).
Best of luck to you, must be tough reloading those little 5.7s, ya must have the patience of Job.
