What the normal free bore for running say 77 SMK or 80 gr’s in a 223
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MY 8 TWIST IS A 223 MATCH CHAMBERI HAVE A 1/8!TWIST THAT HAS .069 AND IT SHOOTS DANG GOOD WITH 75GR BULLETS AND I HAVE ONE THAT-HAS .169 AND IT SHOOTS 80GR BERGER IN TO BUGHOLES