When I first purchased my hunting rifle, I was unaware that even cartridges could be of poor quality. I had purchased ammunition of poor quality. There is a lot of soot in the barrel after use. Chunks of unburned powder appear all the time, and the entire barrel is an inch sooty. I had to use gun oil for cleaning and lubrication. I liked the WD-40 oil the best. After so much torment, I changed my source of ammo purchases. Now I only use
https://bulkmunitions.com/buy-ammo/h.../380-acp-ammo/. I am very satisfied. I think you will find this information useful.