How critical is it to have your brass clean and shiny before reloading? I have just joined a cowboy action group and I am reloading 45 colt and 38 special with a Dillon 550 c/w carbide dies. I tumble my brass with a polish in the medium, then spray the brass with lubricant, reload, and clean the lubricant off with solvent. I enjoy this process however when I start competing I may not have time to be so particular. Any tips would be welcomed. ie: is lubricant really necessary with carbide dies or does it just make it easier and extend the life of your dies?