Rifling Angle to Bullet?

Bart B

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Joined
Dec 25, 2005
Messages
2,758
Here's three barrels:

22 caliber (.224" groove diameter), 1:8" twist.

30 caliber (.308" groove diameter), 1:11" twist.

44 caliber (..448" groove diameter), 1:16" twist.

Which one has the greatest angle the rifling presents to the bullet?
 

J E Custom

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Joined
Jul 29, 2004
Messages
10,301
Location
Texas
Here's three barrels:

22 caliber (.224" groove diameter), 1:8" twist.

30 caliber (.308" groove diameter), 1:11" twist.

44 caliber (..448" groove diameter), 1:16" twist.

Which one has the greatest angle the rifling presents to the bullet?

The 1 in 8 twist.

The faster the twist the greater the angle.

Twist rates are based on the inches it takes for the bullet to make one full revolution=
1in 8 = 1 reveloution in 8" and so fourth.

J E CUSTOM
 

Mikecr

Well-Known Member
Joined
Aug 10, 2003
Messages
5,194
Location
NC, oceanfront
The factors here amount to circumference traveled per bore travel
[2 sides of a triangle]

InvTan(Pi*Diameter/Travel)
All three are ~5 degrees
(I think)
 
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