There are many different 9mm cartridges in the world, but not all of them use bullets of .355 inch diameter. Be sure that the handgun cartridge for which you are loading uses .355 inch diameter bullets.
The main design criterion for these bullets was reliable feeding in semi-auto handguns, and they achieve that to perfection. The 125 grain #8120 bullet, Sierra’s first 9mm FMJ, was introduced in 1981. While reliable and positive feeding characteristics were the main objectives, traditional Sierra accuracy has also been maintained. These bullets will give exceptional reliability and outstanding accuracy, and have been chosen by champion shooters of 9mm handguns worldwide.