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Custom fitting a case to a factory chamber
My question is how would one go about fitting brass to a factory cut chamber. The rifle in question is a factory 300 WSM. I have tried necking down 300 Rem. Ultra mag brass since they are based of the same parent case, the .404 Jeffery and have had less than admirable results. Anyone have any ideas?
step one: sell the RUM brass that you don't need.
step two: just purchase 300wsm brass (Norma if possible or win).
Either set up your fl sizing die according to your chamber or neck size them after they are fired first in your chamber. Rum brass isn't exceptional so it doesn't pay to go through the trouble since Norma makes excellent wsm brass.
I used to re-load but now I "hand-load".
-- Well, at least I try --