The FBI tests of the Carcano's accuracy showed:
1) FBI firearms expert Robert A. Frazier testified that "It is a very accurate weapon. The targets we fired show that."
[29] From 15 yards (14 m), all three bullets in a test firing landed approximately 2 1/2 inches high, and 1-inch (25 mm) to the right, in the area about the size of a dime.
[30] At 100 yards (91 m), the test shots landed 2 1/2 to 5 inches (130 mm) high, within a 3 to 5-inch (130 mm) circle. Frazier testified that the scope's high variation would actually work in the shooter's favor: with a target moving away from the shooter, no "lead" correction would have been necessary to follow the target. "At that range, at that distance, 175 to 265 feet (81 m),
[31] with this rifle and that telescopic sight, I would not have allowed any lead — I would not have made any correction for lead merely to hit a target of that size."
2) The rifle was unable to be "sighted-in", using the scope, without the installation of 2 metal shims (small metal plates) which were not present when the rifle arrived for testing, and were never found.
[32] Frazier testified that there was "a rather severe scrape" on the scope tube, and that the sight could have been bent or damaged. He was unable to determine when the defect occurred before the FBI received the rifle and scope on November 27, 1963.