The Commonwealth’s second expert was Charles Van Amburgh of the Remington Union Metallic Cartridge Company of Bridgeport, Connecticut. Before going to Remington, he had spent nine years at the Springfield Arsenal, and then periods at the Westinghouse and Colt Firearms companies. His evidence was a corroboration of Proctor’s. He, too, had compared Bullet III with those recovered from the sawdust. By measuring the lands, he had determined that the bullet had been fired from a 32-caliber Colt. As to whether he thought it had been fired from Sacco’s Colt, he replied circumspectly, “I am inclined to believe that it was fired, Number III bullet was fired, from this Colt automatic pistol.” He went on to say that there was a rough rust track at the bottom of the pistol barrel, and that corresponding marks could be traced on the bullet. Under cross-examination he admitted that it was common for Colts to rust at that particular place. Like Proctor, he thought that the other five bullets had come from a Savage and had been fired from the same weapon. Burns, the first of the defense’s experts to testify, had spent thirty years as a ballistics engineer with the U.S. Cartridge Company. He agreed that Bullet III could have been fired from a Colt but felt that it could also have been fired from a Bayard, a foreign make. Whatever pistol it had come from, the rifling had been fouled and corroded. The other bullets, he testified, could have been fired from a Savage, a Steyr, or a Walther. Burns produced six of the eight bullets he had fired from Sacco’s Colt—the other two, he explained, he had lost. He pointed out that the lands and grooves were regular and clean. To the question whether Bullet III had been fired from Sacco’s pistol his answer was: “In my opinion, no. It doesn’t compare at all.” J. Henry Fitzgerald, the second defense expert, backed him up. Fitzgerald had been twenty-eight years in the weapon business and was now in charge of the testing room at the Colt Patent Firearms Company. “Number III bullet was not fired from the Sacco pistol,” he told the court. “I can see no pitting or marks on bullet Number III that would correspond with a bullet coming from this gun.” With these paired contradictions the bullet testimony ended. Berardelli had owned a 38-caliber Harrison & Richardson revolver. After his death it could not be found. It was Katzmann’s contention, underlined in his summing-up, that the revolver found on Vanzetti the night of his arrest had been lifted by Sacco from the dying detective.