The Hornady Bullet Comparator Inserts are designed for use with the Hornady Lock-N-Load Bullet Comparator.
It elminates variables when measuring the over-all length of a bullet. Bullet length can vary a few thousandths due to material variation and tip finish.
The Lock-N-Load Bullet Comparator Inserts allow the reloader to measure the bullet from the base to a specific point on the ogive, which has little variation, if any. This versatile system also provides the reloader with a much more consistent way to monitor the overall length of their reloads, allowing the reloader to build more precision into their handloads, that translates into better groups at the range and more meat in the freezer.