Pt.4) 7.62x39 Cast Bullet: Measuring a Rifles Groove Diameter

Now that we have a good chamber cast and have all the measurements that we need from the breach end of the rifle, lets slug and measure our barrels groove diameter!
Also, you'll meet a very pretty girl that doesn't say much. Then, there'll be a trivia question with an opportunity for public recognition and personal endorsement!
Like, Subscribe and I'll see you soon!