Well, you give a lot of extraneous information which has exactly zero to do with the gun, such as your height (?). Without a picture of what you are seeing there is no way anyone can say if it is normal or not. As long as the gun isn't spitting lead it's fine.

There will always be some deposit in a revolver, lead, graphite from the powder coating, soot, wax/lubricant, primer residue, etc. Both lead and graphite appear shiny if rubbed. The amount of fouling is more dependent on the ammunition being fired, but all will leave deposits.

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Gunsmithing since 1961