I have marked both primers and bullets with sharpies, when I am working up new loads. I mark the primers/heads with dots/hash marks/etc... and the bullets just forward of the ogive. The nice thing about marking the bullets in this manner, if you use a white target anyway, is that you can look at the target and determine which round made which hole. You can even do half the bullet one color, and the other a different color to get more possibilities. Red, blue, and green seem to work best. Black is difficult to tell from the blue. I stole this method from this guy.
very good link. i never thought the marker would color the target like that but im gna try that thanks.