Countryboy1150
Member
I have run into a problem. I was plunk testing my rounds. I had 4 rounds that would not plunk. Its all Winchester brass. My COL is plunking good at 1.255. But these 4 would not go. So I decided I would shorten my COL as a test just to see. I went all way down to like 1.238 and they still wont go. I measured case mouth to be.471 and rim was same. Its only with Winchester brss. Anybody else run into this problem?