Sid, how do you like the 7-300wm? I have been thinking about rebarelling my STW to the 7-300wm. Originally that is what I wanted but I let the smith talk me out of it. What welocity are you shooting the the 180 bergers?
I shot my savage 243 barrel out using 95gr bergers. Killed many deer and coyotes. They perform great. I used H4831sc powder and had velocities right around 3100fps.
My rifle is a single shot so the shoulder does not hinder feeding for me and there is no problems when setting the shoulder back.
As far as brass life I have not had any failures yet but I only have 4 firings on 50 pieces.
I have a savage with a shilen on it chambered in 20 Practical and I love it. I am getting 3950fps out of the 24" barrel with RL 10X under the 39gr blitzking.