Yes, IN my '51 Tulas I used Rem-40X - a liquid with fine abrasive 'suspended' (when you shake it up) - to clean out the last of the 'dark areas'. I poured it onto an 'over-cal' brass brush to scrub the 'edges' of the rifling so virtually no crap remained. It still shot like an SKS - ca 4-5 MOA - HA ! Looks like it was never cleaned well b4 I got it, and NO chrome bore.
Then a pic of my new T-56 Frenchie last month after cleaning the Cosmoline out.


Then a pic of my new T-56 Frenchie last month after cleaning the Cosmoline out.

