Interesting Problem With 45 Auto Rim Brass
I got an S&W 1950 that has had some AR brass bind up when I shoot in DA. It does not bind in my 25/17. It appears that the hand is binding on some case rims. I measured case rim diameters and found that diameters ran from .510” to .514”. I took cases in .001” increments and off to the range. No binding at .511” or less, binding starting at .512” and really tight at .513”. Approximately 60% of the cases were .511” or less now I have started trimming the rest.
45 Rim or 45 acp rim diameter, to large.
The rim diameter may keep growing? Had it happen in 45 acp, S&W 645 auto, with a hot load of BlueDot.
When i tried to fire the same brass in my Colt Gold Cup with target loads , the rim was to wide to slide up the bolt face. Caused jams.
https://www.thehighroad.org/index.ph...5-acp.939/full