Spent a couple bucks at Brownells for chamber guage slugs. These are the ones that measure maximum brass length in your specific chamber. Measured both my 6.5 SAUM and my 264 win mag.
Bottom line, both chambers are cut with brass length potential of .030-.040 over book max case length. Based on my measurements, I won't have to trim brass for a very long time.
Looking forward to measuring chambers of my 270 WSM, 260, 308, 30.06, and 243. No telling how much time I have wasted trimming brass to book recommendations. I highly recommend these cheap gadgets!!!
http://www.brownells.com/reloading/...clair-chamber-length-gage-prod32925.aspx
