---I posted for input ( Borrow Your Brain) in ref. to a 38-55 I'm gonna have JES re-bore. How many grooves do you suggest, got some really good response & then the post has been removed, Why is that? Oh well, I appreciate all of the knowledge that was posted & shared & would like to hear more of your input. pretty much settled on the twist rate but input on that subject is always welcome. What's your opinion? Thanks -06