BlackHawk 9mm ammo

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Apr 25, 2011
Hey guys, don't post usually unless I have a question but I'm a long time lurker. Anyway, I just got my BlackHawk convertible 357/9mm. I have never had a SA, convertible before or anything that is similiar in style to this BlackHawk. While reading the manual it stated for 9mm use metal casings only to avoid piercing. My question is what is meant by piercings and the next question is and Im kind of embarrased to ask this but, when referred to metal casings only is that brass. The reason Im asking is to my understanding the brass casings are also metal strips, correct?
Thanks guys