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For my boltgun I run the Sierra 220s about .015-17 off the lands. That gives me the best accuracy. Sierras tolerate bullet jump pretty well.
My bolt gun was chambered with a PTG 300 Hush reamer (aka 300 WTF) so I cant help too much with an OAL for a 300 BLK chamber.
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I load and shoot the brass I make
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