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The mags are probably the same as they're the same parent case. The important thing you'd have to change is the barrel.
Am I missing something? A .243 barrel in not appropriate for shooting a .22-250!. You'd have to use the .22-250 mags (not sure of the configuration), but more importantly, you'd need a .22-250 vs. .243 barrel.
So is it the .223 that has the same case as the .243? I guess maybe i got the 2 mixed up??