An excellent article on bullet lube and what it actually does along with what forces are acting upon the lube.
Lubricating Cast Bullets. Bullet lube does more than you thought
I've showed this picture before, it saw sent to my by a member on another website. We were discussing grease grooves and lube groove compression with round vs square lube grooves.
As you can see the lube grooves are compressed compared to the un-fired bullets above the recovered ones in the lines below.
I read the article. It is very interesting indeed !
It does a great job of presenting a logical theory. He backs up his theory with presentation of what went into the barrel, what came out of the barrel, and what was left behind in the barrel.
It makes great sense. And, it may be what is happening in the barrel. But we don't know.
We don't know, because he presents no proof. There is no way we can "see" what is going on in the barrel as it is being fired. The pressure and heat is too much for present technology.
As for the lube-grooves being compressed - were the grooves compressed by the force pushing the bullet from the rear as it was fired?
Or, were the grooves compressed from the bullet stopping suddenly, and the rear of the bullet piling into the stationary front, when it hit whatever it hit ?
It looks very much like those bullets hit something, as evidenced by the distorted noses.
Ballistics is a very difficult "science", because Ballisticians really cannot prove what has happened. They can theorize, and use that theory until something comes along to disprove it (as all science is supposed to be done), but proof is very difficult.
