As stated they are alum. casings with Berdan priming to discourage reloading and will only safely withstand the pressure of firing one time. As for the bullet, if the box says Gold Dot JHP it is one of the best JHP designs to come along in quite a while. The 200 gr. has a huge cavity, the 240 gr. slightly smaller. You may have an older box that was made before the Gold Dot introduction. I have purchased probably 500 rounds of the .44 Spl. Gold Dot Blazer and the factory load will reach almost 900 fps. from a 3 in. revolver. I actually have pulled most of them down to use the bullets in my own handloads in Federal brass cases with Federal primers. It is the best .44 Spl. load I have seen. I have read that the Magnum and Spl. bullets use a different construction, mainly to get reliable expansioon from the slower Spl. loading.