Stick with the original Partition bullet.The Partition Gold does have the steel cup in the base as well as a thicker jacket up front.The result however,is a smaller front core which,coupled with the thicker jacket,does not expand as well.The overall length is slightly more due to the increase in copper and steel in the bullet,but I have heard this can cause problems with accuracy.I havn't tried them myself so I don't know firsthand,just what I've heard on the grapevine.....