He does fine work that's for sure and the price is right. Has been 50 to rebore and 50 to put in rifling for years. Can't say on the twist. I just shoot 60 gr in the couple he did in 58. Sorry don't know the twist, just told him RB .575 and .010 patch. I've heard folks say he will cut however many grooves you want and so on. I just let him do what he does. He knows more about it than I do. The ones I have from him and Rayle both do very well.