Cartridge : Federal Premium 55gr Trophy Bonded Bear Claw Firearm : 16.0" barrel, gas-operated action with 1/9" twist rate Block calibration : All depths corrected (From estimated 10.4cm at 590 ft/sec) Single shot fired through two pieces of 20 gauge galvanized sheet steel, offset 4" from each other (weakest part of a car door) and two sheets of 12 ounce denim fabric (light clothing). Distance from muzzle to the first piece of sheet steel was 7 yards. This test deviated from the FBI standard in that the block was offset 2" behind the rearmost piece of steel, due to range conditions not permitting the full 18" offset. Shot impacted ~ 1.5" right of center, causing the sides of the gelatin block to be destroyed. Please note that this is not due to the bullet, so much as it was due to poor shot placement. Even though this particular round has tested to be very impressive in bare ballistic gelatin. Bullet impacted at an average velocity of 2685 ft/sec, penetrated to 13.0" and expanded to 0.455" average diameter. Retained weight was 52 grains. Velocity for the calibration was estimated due to a drained battery on the chronograph - discovered of course on the firing line. The BB gun used for calibration averages 587 ft/sec for 16 pumps ... so I shot the block at 18 pumps and am calling it 590 ft/sec. Velocity for the tested bullet was obtained for a 10 shot group (at an earlier date) at 5 yards from the muzzle.