The first thing you want to do is get rid of those Silver Tips. Keep in mind that in the great Miami FBI shootout, they discovered that one of the problems in that shootout was not the 9mm round but the Silver Tip round itself. It was designed to not penetrate properly because over penetration was a huge concern at that time. As a result the bullets that the bureau used stopped just short of hitting the heart of,IIRC, Platt. The bullet did what it was supposed to do, but that was simply not enough. Any one of the rounds manufactured today by the major manufacturers such as Winchester, Remington, Federal etc are all good performers. I carry the Ranger 147 grain and I can tell you from personal experience that it works just fine.