Judson,

The 450#2 works just fine in the No.1. I had my factory .458 Win punched out to 450#2 for starters, which worked well. Required the trough in the top of the block to be slightly enlarged, to clear the rim, and of course, extractor work. I wasn't happy with the extremely muzzle heavy balance of the factory barrel, so I've had it replaced with a 25" Lothar Walther tube, and in the middle of a total rebuild of the rifle. SSK did the original work on the factory gun, and did a great job.

Jeff