Firearm: .38 Special with 1 7/8" barrel Cartridge: 148gr Federal Gold Medal Match, full wadcutter profile Block calibration : 8.9cm at 586 ft/sec Single shot fired at block, bullet penetrated to 16.0" and was found 'sandwiched' between the rear face of the gelatin block and the front face of the polyester bullet arresting box. Bullet recovered at 0.386" average diameter. The recoil from this round was very slight, penetration depth was more than adequate, and slight expansion occured. I like it as a choice for recoil-sensitive shooters, using .38 Special snubnose revolvers. Talk with other shooters about this test on The High Road.org : www.thehighroad.org