Ammo Checker Features Lyman multi-caliber Ammo Checkers have been extremely popular with reloaders. Now based on demand from Lyman customers they are adding gauges having 8 chambers with all being of the same caliber. This gauge allows reloaders to take multiple cartridges right off the press and check them as they go. If they fit they will chamber in your gun. Ammo Checker Specifications Lyman Ammo Checker Multiple Block 9mm