8.6 BLK Thread

[DadSmith]

Looks like a 40 Super with a much longer neck. Cute project.

The important thing to remember about the 8.6 is that it's rotational velocity from a 1:3 twist significantly increases energy on target. A 1:6.5 barrel in the Razerback wont get that.

What is the speed of the rotation. I read it somewhere but have forgotten. I remember it being crazy fast.

 

[Aszerigan]

What is the speed of the rotation. I read it somewhere but have forgotten. I remember it being crazy fast.

Bullet RPM = MV X 720/Twist Rate (in inches)

For a subsonic - 1050 x 720/3 = 252,000 rpm (300gn Matchking)
For a supersonic - 1970 x 720/3 = 472,800 rpm (210gn Barnes TSX)

For comparison -
308 supersonic - 2800 x 720/12 = 168,000 rpm