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Bill, no Sir. The end of the barrel/muzzle has a 15 degree crown cut into the muzzle for less disturbance when the bullet exits the muzzle for greater accuracy.

Mr. It has nothing to do with temperatures. Basically the tip of the muzzle has a 15 degree crown to protect it from any damage compared to having a flat muzzle. If you know, if the crown gets damaged it will cause accuracy and precision issues. 15 degrees offers a bit more protection.

Bill, No that is the angle cut on the barrel crown to protect it and improved accuracy from rifeling not being damaged on muzzle tip. 15 degrees is a deal with most muzzle crowns being beveled at 11 degrees..