I bought a push feed 70 in 264 win mag for $300.00 with the express purpose of rebarreling. I've had a 264 and definitely did not want this one with a sporter contour 24" barrel and head clearance of over .040". I used a gunsmith I have used before in Salt Lake City area and now my headspace on the 375 Ruger is .002".
Mine has a 24" Pac-Nor #5 contour 3 groove that is finished at 24". I am very impressed with the clean up on the Pac-Nor as compared with my other barrels from Hart, Brux and Douglas. I started breaking it in but with just some carbon on the first patch and the 3rd patch clean and white, I just started shooting it.
Like Texas I am finding the brass a little soft. Mine has no feeding problems. I have a Knoxx stock and it is heavy at almost 12 pounds. Easy to shoot though.
