Yep, I used it and highly recommend not using it. I ruined a rifle bore with it. Maybe I used to slow powder or something, but I borescoped it before and it was rough but at least the rifling had its edges and shot 1MOA or better. I just hated thecopper fouling. But after the tubbs kit, I turned a 1MOA rifle into a 1.5 to 2MOA rifle. Never could get my accuracy back. Tried 4 different bullets, 3 different powders and different primers. I ended up taking back to the gunsmith and borescoped with a hawkeye again, and the all the edges were rounded. Never again. Ended up with a new barrel.