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According to Wiki, WD40 was developed in 1953. That is much earlier than the Apollo fire. Maybe the fact that the inventor worked for Rocket Chemical Company contributed to this myth.

Anyway, TDDudes advice about brushing is right on. I think he's trying to say that you should push the brush all the way through the barrel.

Venus - Another important thing that is covered in the Box-O-Truth is that you put in the brush from the breech end so you don't damage the crown of the barrel with the cleaning rod.

As I previously stated, there are as many cleaning methods as there are forum members. I am not going to get into a debate about WD-40. It has been discussed several times on this forum.

My previous post was to specifically address Venus' concern about damage to the barrel from cleaning the bore with a brass brush. My point was that a wet brush should be used.
Box-O-Truth states:

I use Hoppes #9 and a .45 caliber bronze brush to scrub the bore.

A brass brush wetted with Hoppes will not damage a Kimber 45ACP barrel.

Venus - There are many methods for cleaning a gun as there are forum members. Each one does it a little different. The box-o-truth shows one for the Kimbers http://www.theboxotruth.com/docs/edu47.htm

As far as the brass brush - think about it this way. You are shooting thousands of rounds of copper-jacketed bullets out of your barrel at 900 fps. The brass brush is wetted with Hoppe's and is only pushed through a few times.