im trimming alot of brass on my forster trimmer........... i know its good practice to chamfer necks clean........... would it make a huge difference if i didnt ???when loading in station #1 (dillon550b) the burrs are gone and inside neck is clean ........dont know if the burrs got smashed down or press off(feels good to me)...........crimping is same........dont see how it would make a difference .thanks