I have a newbie question. As I sit very impatiently waiting for my new to me Beretta 96D to arrive in the mail (it will be just almost 4 weeks from mailing the cash to when it arrives) I have been looking for .40 ammo to feed it. I have seen some ammo with aluminum casing instead of brass. Are they OK or will they cause problems? Does anyone have any knowledge they are willing to part with.