Blue68f100
Member
Back ground: I have a 224 Valkyrie that I built about a year ago. Shilen 1:7 twist, 28" SS blank, finished to 24", rifle length gas system. The reamer was a piloted Clymer that I special ordered. Did my own barrel machining and set the chamber up at min spec. Adjustable gas block to fine tune the action.
All the brass is still at min trim length (1.590") after 5 firings. The only ones that have grown are the ones where I pushed them over the edge with hot loads. Pressure bolt markings on base . But those are only 0.003"-0.005" over the trim length.
The brass I'm using is Starline, which came in at trim length. The necks have been turned to even up the wall thickness. But that's all I've done to the brass besides my normal prep work. I have 5 firings on this brass, anneal every cycle. Using Redding Deluxe dies. I've only had a hand full of the brass fail due to loose primer pockets. When I size the brass I'm only moving the shoulder back to min. I can clean up the fired brass up and it sets about 0.002" high in my chamber case gauge, made with the same reamer as the chamber. So I'm not getting a lot of stretching to begin with.
Has anyone ever run into a AR-15 that does not stretch the brass? It's a welcome surprise but not what one expects.
All the brass is still at min trim length (1.590") after 5 firings. The only ones that have grown are the ones where I pushed them over the edge with hot loads. Pressure bolt markings on base . But those are only 0.003"-0.005" over the trim length.
The brass I'm using is Starline, which came in at trim length. The necks have been turned to even up the wall thickness. But that's all I've done to the brass besides my normal prep work. I have 5 firings on this brass, anneal every cycle. Using Redding Deluxe dies. I've only had a hand full of the brass fail due to loose primer pockets. When I size the brass I'm only moving the shoulder back to min. I can clean up the fired brass up and it sets about 0.002" high in my chamber case gauge, made with the same reamer as the chamber. So I'm not getting a lot of stretching to begin with.
Has anyone ever run into a AR-15 that does not stretch the brass? It's a welcome surprise but not what one expects.