Barrel Breakin

[Ksmirk]

Cryo is just a stress relief process and helps with the alignment of the microstructure from what I've been told, but this is for tool steel for punches and dies but I don't see why it would be any different for rifle barrels?

Kirk

[CRITRGETR]

Check out the web link below for a product used to lap barrels & increase accuracy. Developd by Superior Shooting Systems (David Tubb) for precision shooting.

www.zediker.com/tubb/finalfinish.html

[Jeff in TX]

OK, I went to the Final Finish web site and did some reading on the product. Best I can tell you are fire lapping a barrel. Don’t get me wrong here, but I just can’t see how this product will do everything it says it will. On the other hand, I have a great respect for David Tubb and his knowledge about our sport. But being an engineer myself, I’m puzzled at the process.

First lets look at trying to moly coat a barrel with moly bullets because his process is somewhat the same. Applying moly or any other type of bullet coating to bullet and trying to provide a consistent coating throughout the barrel is never going to happen. Looking at a coated bullet, there is only so much bullet surface that is going to come into contact with the barrel. Most of the coating is going to come off in the throat area of barrel. Some of the coating will be vaporized due the excessively high temperatures generated by round going off. Most of the coating that is left on the bullet will bond to the throat area and the first couple of inches past the throat. There is no way to coat an entire bore by just using only coated bullets. That’s like trying to wax your entire car with just one dab of car wax. The initial contact area surface will receive wax, but there’s just no way near enough wax to cover the entire car

Here are my thoughts on fire lapping and I’m no expert, just a very logical person. Applying an abrasive to bullets is much like applying moly or another type of coating. Except I don’t see much of a silicon carbide type abrasive being vaporized by the excessive temperatures when the round goes off. However, just like moly I can see it really digging into and polishing the throat area and then tapering off after the next few inches. But I can’t see it giving a uniform barrel polish all the way down a 20 to 30 inch tube.

Just my $0.02 on the matter! Anyone else’s thoughts?

[MarkA]

Cripes! We sent a man to the moon in '69, have had gun powder 400 or 500 years and no one knows how to break in a barrel?

I now strongly believe that the best way is just to go slow, not get it hot, shoot few rounds and clean lots for the first 50 rounds or so.