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cdbeagle · February 18, 2013, 10:57 PM

I have a CZ 550 American in 6.5x55. The rate of twist is 1:9. All I have ever shot through it is PRVI 139 grain. The rifle shoots this ammo very accurately. I am planning on trying some other ammo that is higher velocity in 140 grain. I have read that the 1:9 twist in my rifle won't stabilize 140 grain bullets. It seems to do well with the PRVI though. What are your thoughts?

February 18, 2013, 10:57 PM	#1
cdbeagle Senior Member Join Date: January 3, 2012 Location: Justin Texas Posts: 313	Rifling Twist for 6.5x55 I have a CZ 550 American in 6.5x55. The rate of twist is 1:9. All I have ever shot through it is PRVI 139 grain. The rifle shoots this ammo very accurately. I am planning on trying some other ammo that is higher velocity in 140 grain. I have read that the 1:9 twist in my rifle won't stabilize 140 grain bullets. It seems to do well with the PRVI though. What are your thoughts? __________________ Assistant Secretary - U.S. Dry Bean Council