Learning the hard way...
 

That I need to clean all the packaging grease and whatnot out of the bore before I go shooting a bunch of primers off. :nonono2: I have been scrubbing and scrubbing and got most of the bore looking like a mirror but there are a couple little spots still I'm trying to get off. I went and got some Birchwood Casey Bore Scrubber and it is taking it out but not without a fight. I'll just chalk this one up as a lesson learned.

There are some lessons you never forget. ;)

Have you tried breakfree or carbuerator cleaner? But once you get it clean, be sure to oil the bore.

No haven't tried any of that. This bore scrubber reminds sort of like that stuff and is working pretty good.