Sinclair International ( Brownells) Hex Style Bullet Comparator #1

The Stainless Steel Sinclair Bullet Comparators are cut with throating reamers to accurately duplicate the actual throat of a rifle. The comparator is used in conjunction with calipers. This allows for precise measurements of ogive to cartridge case base readings. #1 covers 22 Caliber (.223-.224), 243/6 mm (.243), 25 Caliber (.257), 264/6.5 mm (.264), 284/7 mm (.284), 30 Caliber (.308)