Just finding an RSM action by itself is going to be like finding a needle in a hay stack. Easier to find CZ action or a donar 458 winchester in cz and rexhambering it. Chamber reamers are avsilable. Also need bolt face and feed work. May still end up around 6k with all the gumsmith work.Somehow, I "picked up" a 416 Rigby barrel from a Ruger RSM, I've wondered about having it rebored to 450 Rigby; have to source an RSM action first ...
Or you can get a cz 416 rigby as a donar and rebarrel it.
Krish
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