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I know he was using it for 308 subs but not sure on his 300 blk. I do remember he had to set the bullet way back in the case to get then to feed correctly due to the round fat nose on them.

Friend of mine works up his own 300 blk loads, some use a 220-230 grain bullet, can't remember off the top of my head, and I think he uses trail boss powder a lot for his heavy sub loads. Gives high volume without too much pressure.