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You don't need a 10 twist to shoot 50 gr .224s.
The old standard 14 twist is fine, as Rimfire says, and as I have found out.
A 10 twist should handle bullets up to 69 grains according to Ken Waters and Sierra.
A 9 twist .223 will sometimes handle 75 grain bullets. Will the extra velocity from a 10 twist .22-250 do as well? I don't know.
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