I am getting ready to order a barrel for a .300wsm build and am not sure on the twist. I will be shooting 150-168 gr, gonna try and hope the barnes shoot well. It will be kind of a do all whitetail gun, shooting close to 500 yards max. Thinking of about a #3 about 24". From what I have read, it looks like the twist should be 12-14, really around 14, but it looks like alot people are shooting 10. Any input or suggestions on any of this would be appreciated. Thank you