I'm not a Benchrester,so I'm not much help there. I know that some of them use a 6MM for that. The 6.5 X 55 is accurate though,& I have used it in NRA bolt gun competitions out to 500 yards with good results.
To be competitive in BR shooting requires cubic dollars. A rifle that will truly compete will be hand built by a expert. Barrels only last 5-600 shots before they are replaced. This info comes from the best BR magazine out there.
Too rich for my blood. Good luck. :grin:
Oh yeah,if you want to try NRA Hi-Power,I can help you on that.