The Viper Express shot shell delivers a payload of #9 lead shot with enough power and velocity to penetrate over 1/8 inches of 200 lb compressed paper board at over 10 yd. This ammunition is to be used with the Viper Express or Shadow Express airgun. Read all manufacturer's warning labels. Precision pellets/shells for Gamo Express Series Airguns. All the power and penetration needed for hunting small game and birds at medium to close range. Our precision raised ribbed, choked barrel yields a tight pattern of only 12 inches at 10 yd. The EXP20 .22 caliber shotshell delivers a 17 grain payload of #9 shot with enough power and velocity to penetrate over 1/4 inches of 200 lb compressed paper board at more than 10 yd.