How To Use the Hornady OAL Gauge To Load More Consistent Ammo

Published on March 2, 2020
Duration: 4:16

Achieve greater rifle ammo accuracy by precisely controlling bullet seating depth with the Hornady OAL Gauge. This tool measures the distance from the bullet ogive to the rifling lands, allowing for consistent loading. Start with a recommended depth of 0.020" to 0.040" off the lands and adjust your seating die accordingly, noting that closer seating can increase pressure.

Quick Summary

The Hornady OAL Gauge measures the distance from the bullet's ogive to the rifling lands, crucial for consistent seating depth and rifle ammo accuracy. Use it with a Bullet Comparator and calipers, aiming for 0.020" to 0.040" off the lands, but be aware closer seating can increase pressure.

Chapters

  1. 00:00Introduction to Accuracy & OAL Gauge
  2. 00:11Setting Up the Hornady OAL Gauge
  3. 00:42Measuring Bullet-to-Lands Distance
  4. 01:30Using the Bullet Comparator with Calipers
  5. 02:07Determining Optimal Seating Depth
  6. 03:12Curved Gauge for Different Actions

Frequently Asked Questions

What is the primary benefit of using the Hornady OAL Gauge?

The Hornady OAL Gauge allows handloaders to precisely measure the distance from the bullet's ogive to the rifling lands in their firearm's chamber. This measurement is crucial for achieving consistent bullet seating depth, which directly impacts rifle ammunition accuracy and performance.

How do you use the Hornady OAL Gauge to measure seating depth?

Insert a caliber-specific modified case attached to the gauge into the chamber until it headspaces. Push the internal shaft until the bullet touches the rifling, then lock the screw. This captures the measurement relative to the lands.

What is the recommended bullet seating depth off the lands?

Hornady generally recommends starting with bullet seating depths that are 0.020 inches to 0.040 inches off the rifling lands. This provides a good starting point for accuracy tuning, but actual optimal depth can vary by rifle and load.

Why is measuring from the ogive more accurate than the bullet tip?

The ogive is the curved portion of the bullet that transitions to the bearing surface. Measuring from the ogive, using a bullet comparator, provides a consistent reference point regardless of minor variations in bullet tip shape or damage, leading to more reliable seating depth measurements.

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