Bisley Man
Sharpshooter
A friend had a similiar problem with a Buckmark .22. I told him about an article I read in gunmag in the 1970's. Clean barrel and chamber with Hoppe's#9 and toothpaste. Put toothpaste (not gel) on a bronze bore brush,dip in Hoppe's and scrub.Worked for me with badly leaded bores, and were easier to clean the next time. Today J-B compound and Kroil works better.