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BREAKING IN A RIFLE BARREL
marks which can fill up with copper when the gun is shot are left during
the manufacture of rifle barrels. The purpose of breaking in a rifle barrel
is to polish or peen these imperfections smooth with the barrel. When
a bullet is fired over these marks, it tends to polish the machining marks,
but at the same time, copper is caught in the ridges. If you continue
to fire bullets down the barrel without cleaning, the barrel will continue
to foul (collect copper). Fouled barrels do not shoot as well as clean
barrels. With that in mind, here is a recommended method for breaking
in a barrel.
Note: The use of brushes is fine in everyday cleaning, but not in the barrel break in process. If you use a brush, the copper reading will be coming from the brush rather than from the barrel itself.
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