For me, it was a few reasons. It went across the grain (my cleaning upbringing) of leaving a barrel fouled without removing all fouling to get the true benefit. I was always worried about pitting. Second, it took alot of prep of the barrel and several rounds to get back the velocity and accuracy I was. Lastly, I had a few instances where I saw huge pressure signs out of no where. It took some discipline to get the benefits out of it. Little mental notekeeping to remember the condition of the barrel I left it at.