223 Rifle Twist Chart - Vista Outdoor
Maximum Bullet Length (in.)
1.600 1.500 1.400 1.300 1.200 1.100 1.000
223 Rifle Twist Chart
Example:
A proposed 69 grain match bullet is pulled from the case, and measured for length with a caliper. The bullet is .900" long.
The .900" value is followed to the right until it intersects the minimum twist requirement line.
The twist required would be 1 : 8.3 or faster.
Since no rifles are chambered in 1:8.3, a twist of 1:8 or faster would be required to shoot this bullet.
0.900
0.800
0.700
0.600
0.500
Assumptions: Based on Greenhill's Equasion, velocity less than 2800 fps, using copper jacketed lead bullets.
0.400
5
6
7
8
9
10
11
12
13
14
Twist Rate of Barrel ( 1 : Inches per Revolution)
Prepared by Durham, Ernest 4/8/2008
Page 1
Bullet Twist and Maximum Bullet Length Based off the Greenhill Equasion
Rifle Twist Rate ( Inches for one full revolution) 5 6 7 7.5 8 8.5 9 10 11 12 13
Maximum Bullet Length 1.492 1.243 1.066 0.995 0.932 0.878 0.829 0.746 0.678 0.622 0.574
0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150 0.223 150
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