Federal Syntech 9MM Solid Core Handgun Ammunition +P 147gr TSJ is a high–performance ammunition designed for personal defense. It offers an alternative to traditional jacketed bullets by constructing the bullet out of a solid copper core with a light polymer coating. This coating reduces barrel friction and helps the bullet to stay true to its flight path on impact. The 147 grain bullet is a total synthetic jacket (TSJ) that provides superior accuracy and a controlled expansion to maximize stopping power. This ammunition is a +P load (higher pressure), so it is important to make sure that your firearm is rated to accept +P loads before using it.