The Hornady Lock-N-Load Bullet Comparator Set of 6 (Hornady part no. B234) attaches easily to the blade of a caliper with a thumbscrew, turning an ordinary caliper into a tool for measuring bullet seating depth from the ogive rather than the tip, where minor variations can throw off a true reading. It uses interchangeable inserts and can also be used to check the base-to-ogive uniformity of a batch of bullets. This set includes six inserts covering .224-inch (5.56mm), .243 (6mm), .257, .277, .284 (7mm), and .308 (7.62mm and 8mm).

Key Specifications

• Attaches to a caliper blade via thumbscrew, no separate measuring tool required.
• Uses interchangeable inserts to measure bullet seating depth from the ogive.
• Also checks base-to-ogive bullet uniformity across a batch.
• Set includes 6 inserts: .224-inch (5.56mm), .243 (6mm), .257, .277, .284 (7mm), and .308 (7.62mm and 8mm).
• Compact comparator body measuring roughly 6.2 inches.

Frequently Asked Questions

What calibers does this comparator set cover? The included inserts cover .224-inch (5.56mm), .243 (6mm), .257, .277, .284 (7mm), and .308 (7.62mm/8mm).

Why measure from the ogive instead of the bullet tip? Bullet tips can vary slightly in shape and length, so measuring from the ogive gives a more consistent, repeatable seating-depth reference.

Buy the Hornady Lock-N-Load Bullet Comparator Set of 6

Get consistent, ogive-based seating measurements across six common calibers with this Hornady comparator set. See more from Hornady in our reloading equipment selection. Order it from our Lubbock, Texas gun shop for fast, reliable shipping.