Ackleyfan got it right. You want a Hollands .250.
Just out of curiosity, why is the Holland lug "the ticket"? About the only thing it will do that some others won't is fit into a "factory inlet" stock without modification.
I've used Badger, Tubb(or maybe Superior Shooting or both), and Callahan lugs all of .300 and larger, and it takes all of 2 minutes with a dremel tool before bedding them to make them fit.
Just wondering.........
