I had a tang saftey Ruger 77 in 7x57 that would not come closer than 200 fps. with Nosler load data to what was in the book. I took it to Bill Wiseman and had him chamber cast it and the dimensons were way large with a very long throat. I tried adding powder until I got to published velocity but the gun wouldn't group. Eventually I rebarreled it to .270 and still shoot it. Ruger really ran some dogs out in that era. I don't know if it was a barrel problem, reamer wear problem, or just really poor quality control.
