Let me know what twist rate you measure? Yeah, I would measure the twist before incurring gunsmithing costs. I was bummed. I had a bullet that didn't shoot very well in my 300 Win Mag and that's when I found out I had a 10.55" twist. I wasn't very happy. Called the smith who checked his receipt and confirmed he ordered a 10" twist from Lilja. And I was stuck with it... as if I'd ordered a 10.55" twist. Sucks.