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I read alot about the barrel crown is cut at 11°. Why 11°, why not 10 or 12. What is the signifigance of 11°
 

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Well, because it was tested and found that 11 gives you the best (most uniform and ideal) expansion of gases as the bullet exits the barrel providing the least disruption to the flight of the bullet.

And, 11 is a prime number unlike 10 and 12....

MEL

(the last part is a joke :wink: )
 
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