I am building a .375 RUM with a 26" #4 sporter contour barrel. After looking at the muzzle thickness I am wondering is this barrel heavy enough? What is the safe barrel thickness at the "B Measurement" and the muzzle (C Measurement) for this caliber? A #4 contour is 1.200 at the shank (no issues there) and then tapers to .850 (B Measurement) and finally down to .650 at the muzzle (C measurement). This leaves .1375" barrel thickness at the muzzle. Is this enough?