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223 Remington twist and freebore

Looking for a bull or straight contour heavy barrel for a Zermatt Origin action, so I will need Savage small shank threads. Want to shoot 52 grains up to 77 grains bullet at no more than300 yards. I’m guessing that a 1:8 twist should work the best, but what freebore should I be looking at? Barrel length? Thanks
 
From 52 to 77 grain freebore will land you either jumping the 52’s or loosing precious powder volume from the 77’s. I’d use the 223 Wylde reamer for more tolerance of pressure and the 0.062 freebore.
 

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