Re: .6.5 MM X 284 Build?
I've received a note or two from folks suggesting that the load data I posted for this cartridge is a bit on the hot side.
I've not experienced this, but in the interest of safety I would agree that it is better to initially tone things down. This load was given to me during a conversation with Middelton Tompkins almost ten years ago. Anyone involved with NRA match rifle/1k shooting almost certainly knows that name. I've known Mid since I was 19 years old and trust him completely. I never questioned his advise and in my experience the data he provided me has never steered me wrong.
My personal rifle chambered in this is on a Kreiger 4 groove. The reamer is nothing special, just a minimal spec chamber with a throat length appropriate for the bullet weight. The velocities I quoted are real. I stand behind that. I live at 3500ft elevation. Maybe that has something to do with it. All the test groups and subsequent load development work were shot inside COR BON ammunition's fully instrumented test tunnel about 5 years ago. I would have to think their instrumentation didn't give me bad #'s.
Hope this helps.