goodet

I wanted to get some feedback on how you tell if .40 cal S&W shells are made of brass or steel.  I traded for some .40 cal shells but when I got to sort them I noticed the following;   1) They were a dark grey color, not yellow like brass shells would be. 2) They had a coating on the shell case 3) When I take a file to the neck and to the body of the cases, the metal that is showing through is a bright silver color 4) They do not have a mirror finish like a nickel plated brass shell would have.  They are darker in color. 5) Headstamps include Win, R P, and Winchester. 6) Insides of the cases are dark as well.   Having trouble posting a picture at the moment.