ORIGINAL: lemoyne
Their seems to be some confusion, when you use a grinding compound you are lapping the bore [if thats what it really needs nothing less will do] if it only needs polishing the process is the same but you use jewelers rouge or diamond dust polishing compound. Lee
JB bore paste is a very fine abrasive, nothing like grinding or lapping compound. It would take a lot of passes to remove much metal. I made 200 passes in my stainless Omega and it just brightened up the bore and removed some of the machining roughness. My bore still measures exactly the same as before the JB paste procedure or at least a slug from the bore measures the same as close as I can measure with a dial caliper.