It' s a gun barrel not an internal combustion engine!

You would have to fire hundreds, thousands of rounds to do any kind of " break in" .

Firing rounds, cleaning, firing, cleaning really ain' t gonna do anything to the barrel as far as " lapping it in" . The bullets are far too much softer than the barrel to do any final " machining" or " barrel reaming" .

Right? It don' t take a genius to know that the barrel had better be the hardest (by far) material in the equation here.

One thing for sure on " break in" . Don' t try to shoot too far at fist, up you shot yardages little by little. Or you' ll burn out the barrel.

Uncle Matt (in IL)