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