Nope. Cases do dull a little but I use a zip trim to trim, chamfer and debur and at the same time give a couple of spins with 0000 wire wool which equals nice and shiny. If I didn't trim and and chamfer this way, I wouldn't bother with shining them up a bit. It makes no difference but I guess we all like shiny thingsDoes the bicarbonate of soda stop the dulling of the cases. I use my U. S. with citric & detergent to wash off the lanolin Sizing lube and the cases go dull when water rinsed before oven drying.