check out my thread on a long throat .405 win on an Encore! I'm pretty certain 2100 fps with a 400 gr woodleigh is attainable. This is not a lever gun load as I expect it will take 55-56 Kpsi to get there. I'm throating out about .500 with a parrell throat and putting a new cannelure on the bullets to crimp on. Of course it would be easier to just rechamber to 450/400, but then what would the challenge be? I've hit 2250fps out of a long throat .458 winchester, so I expect this will work also.