Avoid the 6.5-284 and 284 on a model 70 CRF action. You will be disappointed with the feeding unless your gunsmith is willing to put a bunch of time working on the feed ramps, etc. I’d go 6.5-06, it’s simple and matches the ballistics of the 6.5x284 without all the hassle.
A good smith can make it slick. You’re right about a 6.5-06 being easier, but my pre-64 6.5-284 feeds as slick as any rifle I have. And I have some good’uns.
Milling the follower spine narrower is one thing he did to accommodate the fatter round. I’m sure he polished the rails. It takes some tweaking.
