Originally Posted by BountyHunter
I used to use BTE until we looked at my bore with a borescope. Looked like a gold mine and BTE was showing it clean. We put in some ME 50 BMG and blue river ran out for 10-15 minutes and borescope showed it clean then.
Also beware of the false positive for green coming off bronze jags.
Borescope is the only way to tell.
My experience is the same as Broz and I use Nickel plated jags. I've used both Montana Xtreme and Copper cream (and others) until they showed white patches and then got blue patches with BTE after, with nickel plated jags.
When using BTE you need to let it soak. On the first couple of passes you will get blue patches instantly but when you get down to stuborn copper you need to let it soak. When I get a white patch after 20 min of soaking, I soak it again and let it soak for 40 min and get a blue patch (from a factory barrel).
If you use BTE properly it will clean your bore to bare metal. I know this because after a BTE cleaning, I have soaked the bore with Wipeout for 8 hours and got a white patch and when I get a white patch from 8 hrs of Wipeout, the bore is completely free of copper... according to a borescope.
If you think 50 BMG has your bore clean, soak it good with BTE and work it in with a few passes of a nylon brush and let it sit for 40 min and see what happens, with a nickel platted jag. Been there, done that.