i loaded up some 44 mag lead swc's to 1746fps in my marlin 1894, it has a micro-groove barrel. my friend told me that 1746fps was too fast for lead and i was going to have a leaded barrel. i just took my rifle apart for cleaning and i dont see any lead in the barrel, i cleand the bore with borescrubber and didnt see any lead on my patches. should i be able to see the lead if it was a problem? or do you just "know" its there? Thanks, Dennis