Well, the 22-250 is a neck-downed version of the 250-3000 Savage, but you'd have to check "Cartridges of the World" or a "Lyman Reloading Manual" for diagrams of case sizes to check if the 250-3000 Savage is based on the 300 Savage case. Sorry, I don't know the answer to that; but with a little Google work, you might be able to check this out.
Old No7
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