Berrys Superior Pistol .40 Cal/10mm .40 Cal/10mm .401 180 GR Flat Point. They are more affordable than jacketed rounds and won't foul your barrel with lead.SAAMI MAX .40 COL = 1.135"SAAMI MAX 10mm COL = 1.250"Can withstand velocities up to 1250 fps Specifications for Berrys 99958 Superior Pistol .40 Cal/10mm .40 Cal/10mm .401 180 GR Flat Point 2: Manufacturer: Berry's Manufacturing Bullet Type: Flat Nose (FN) Bullet Weight: 180 grain Projectile Caliber: .40 Caliber Bullet Quantity: 250 Bullet Fabric/Material: Copper Package Contents: Berrys 99958 Superior Pistol .40 Cal/10mm .40 Cal/10mm .401 180 GR Flat Point 2 Berrys 99958 Superior Pistol .40 Cal/10mm .40 Cal/10mm .401 180 GR Flat Point