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I have a boltgun chambered in .300 Blackout with a PTG reamer. It is the most accurate 30 cal I have ever owned. the rifle barrel is a schillin blank thats was 1x8" wtist that is 16" long. Its dedicated to subsonics, the picture is a group of 11rounds total fired at 100yds. I had a called flier so I fired 11 instead of 10 rounds so the group would be 10 total. as best I can tell its .122" CTC .......
If your thinking of chambering to .300 blackout, do it! you wont be sorry.