The Hornady Lock-N-Load Bullet Comparator Complete Set is an essential measuring tool for handloaders who demand precision and repeatability in their ammunition. Unlike measuring overall cartridge length across bullet tips—a method prone to variations of up to .025 inch—this comparator measures from the ogive, the curved surface of the bullet that makes contact with the rifling. That single change transforms your reloading from guesswork into genuine quality control, round after round.

Built around a body that attaches directly to your calipers with a thumbscrew, the Hornady bullet comparator uses interchangeable inserts to accommodate a wide range of common rifle and handgun calibers. The complete set includes 14 inserts covering .172, .204, .224 (5.56mm), .243 (6mm), .257, .264, .277, .284 (7mm), .308 (7.62/8mm), .338, .358, .375, .416, and .458 diameters. That breadth means whether you're loading .223 Remington for the range or .308 Winchester for hunting, you've got the right insert at hand.

The comparator also serves as a quick uniformity check for bullet manufacturing. Run a few rounds from a new batch across the comparator to spot inconsistencies in ogive dimensions before you load a whole batch. It's a small step that catches problems early. If you're serious about handload consistency—whether you're building match ammunition or hunting loads that need to shoot the same every time—this tool belongs in your reloading bench.

The Hornady Lock-N-Load Bullet Comparator Complete Set is an essential measuring tool for handloaders who demand precision and repeatability in their ammunition. Unlike measuring overall cartridge length across bullet tips—a method prone to variations of up to .025 inch—this comparator measures from the ogive, the curved surface of the bullet that makes contact with the rifling. That single change transforms your reloading from guesswork into genuine quality control, round after round.

Built around a body that attaches directly to your calipers with a thumbscrew, the Hornady bullet comparator uses interchangeable inserts to accommodate a wide range of common rifle and handgun calibers. The complete set includes 14 inserts covering .172, .204, .224 (5.56mm), .243 (6mm), .257, .264, .277, .284 (7mm), .308 (7.62/8mm), .338, .358, .375, .416, and .458 diameters. That breadth means whether you're loading .223 Remington for the range or .308 Winchester for hunting, you've got the right insert at hand.

The comparator also serves as a quick uniformity check for bullet manufacturing. Run a few rounds from a new batch across the comparator to spot inconsistencies in ogive dimensions before you load a whole batch. It's a small step that catches problems early. If you're serious about handload consistency—whether you're building match ammunition or hunting loads that need to shoot the same every time—this tool belongs in your reloading bench.