Bob, that sounds like a really interesting project, as I'm a .257R fan.
When you get it all put together and shoot some targets, I would love to see photos and read your report.
My .257R is on a LA M-700 and is one of the slickest feeding rifles I own. But, it was put together by master gunsmith, Ron Lampert, so I don't know if slick feeding just happened or was the result of Ron's magic. I like the way I can load longer bullets to the COAL I choose without box mag restrictions.
Like you point out, Matt would have a similar situation with the .260 in the LA M-70. It would work.
DF
