By whatever technology you have,cleaning the abrasive range grit off of your brass before you run it into the dies is a good idea.The grit will embed in the brass and you then have an abrasive cutting tool called a lap.
Shiny is unimportant.Clean is important.Sounds like you are doing well!
I do not know what your access to lead is,but if you are shooting .44 magnum,cast lead alloy bullets work great.In USA,we have been able to use the weights used to balance tires,Excellent bullet metal!!If you have pure lead,you may need to add some tin or scrounge such things as linotype,babbit,reclaimed lead hard shot has some antimony.In due time!!