You were so certain you'd "discovered" the absolute BEST way to get carbon out of a bore that a number of people apparently didn't want to answer, for whatever reason.
My experience involves prepping a number of bores down to bare steel for installation of Dyna Bore-Coat since it was introduced over 15 years ago. It requires the bore to be absolutely clean, and the fastest method I came up with after some experimentation was around 20 strokes of a tight bore brush wrapped in a cotton patch, then slathered with JB Bore-Cleaning Compound. Would be willing to bet that's quicker than a brush and Kroil, since I also have considerable experience with Kroil. The JB method takes about three minutes--and eventually became part of the directions for installing DBC, which is highly effective in preventing carbon build-up.
At least a couple of people also suggested highly effective carbon cleaner/solvents.
For also curious about what kind of scope you have on the rifle you used to shoot the half-inch group at 50 yards.
as I made note before I had already tried several things. and this happened to actually work for me it was unusual spot in the barrel that I've never seen before about 2 in long that the entire area in the lands and grooves were black almost like spray like spray like spray painted.
and I'm taking note of every bit of other ideas in this thread..
I understand the bore paste is popular with a lot of people. personally I just don't like it that well. there is some in the cabinet..
the scope used is a Leipold AR 3-9x40 .. keep in mind this is on a mini-14.. and I know the parallax at that distance could be some issue.
I finally found a load the mini liked a bit better then others ..
I had never used 3031 in a . 223/5.66 before but its dure working here with 55gr bullets anyway .
