yes they do recommend leaving it in.I leave Bore Tech in for long periods of time, never had an issue. In fact they recommend leaving in a small amount.
I have not used the carbon remover, but I think I would be having a chat with them if it trashed a barrel!yes they do recommend leaving it in.
i did that with the carbon remover due to the stubborn nature of carbon fouling.
i thought it would be better than much scrubbing and use of abrasives.
the stainless barrel i did it to went black and rough inside and was totally ruined.
@bruce moulds.over the years i have tried many copper solvents.
from using sweets i tried butch's bore shine, and it was useless.
the first effective product after sweets was kg12, and it was quite good.
after some years of that i tried pro shot copper remover, and it was far better, in fact the best of all tried.
i like it quickness particularly when running in barrels as it saves time.
kg carbon remover seems about like boretech carbon remover.
never leave boretech products in a barrel or you will end up with one like my broughton 6.5 super lr barrel - black inside.
when all cleaning is done, hoppes no 9 always seems to be able to pull something else out, and protects the bore as well.
...How do you know you have a copper fouling problem?...
This goes against the grain of those who obsess over copper fouling, but I do not sweat it. I should add that I have shot the TSX family a lot over the last decade plus in several calibers. I run a couple of patches of ballistol through the barrel once every few months (or year) as the spirit moves me. In fact, for a typically well made barrel, I think of copper as a bit like a last finishing filler of any manufacturing flaws.
Many here will relate experiences where copper fouling was detrimental to the accuracy of their rifles. I do not question their experiences. I will simply say those experiences have not been mine.