Bouldersmith,

How well does a rimless case function in a Farquharson? When I had a .250-3000 built on a Winchester Hi Wall years ago, I used 8X57JRS cases to form a rimmed version of the .250-3000, rather than try to get the finiky extractor to work with the original rimless version. RCBS forming dies made the job of producing brass a simple one.