Lyman Pro Single Ammo Checker Features The Lyman Pro Single Ammo Checker is precision machined from corrosion resistant stainless steel to minimum SAAMI chamber tolerances specifically for .300 AAC Blackout. This tight tolerance means a cartridge that passes through the gauge will reliably chamber in a properly spec d firearm giving reloaders confidence in every round before it is fired. The gauge is clearly marked for caliber removing any guesswork about which cartridges it is intended to check. Reloaders simply drop a completed round into the gauge opening to perform the check making it a fast addition to any loading session. This final check step is considered a must by competitive shooters who cannot afford a chambering failure mid-stage and by any reloader who wants dependable function from their ammunition. Stainless steel construction resists corrosion from handling oils and powder residue over repeated use at the bench. Measuring 2 inches the checker is compact enough to keep within easy reach during a reloading session without taking up significant bench space. For anyone loading .300 AAC Blackout rounds who wants an extra layer of quality assurance before heading to the range this ammo checker offers a simple reliable final inspection tool. Lyman Pro Single Ammo Checker Specifications Manufacturer: Lyman Model: Pro Single Ammo Checker Caliber: .300 AAC Blackout Bullet Diameter: .308 Material: Stainless Steel Length: 2 Available At: GrabAGun