The Hornady Lock-N-Load Headspace Comparator Bushings (5-count pack) are essential for any serious handloader who wants precise control over case headspace. If you already own the comparator body, this bushing-only set lets you expand your capability across multiple cartridge families without buying a complete new gauge. These bushings work with a dial or digital caliper to measure the distance from the case head to the datum line on the case shoulder—the critical dimension that tells you whether your sizing dies are dialed in correctly.

Proper headspace control directly affects brass longevity and safety. When cases are oversized, headspace creeps forward with each firing cycle, cutting the usable life of your brass and risking pressure spikes or difficult extraction. By measuring actual headspace changes between fired and sized cases, you can fine-tune your sizing die adjustment to fit your chamber precisely, not some factory standard. That's the difference between cases that last 8–10 reloads and cases that barely survive 3 or 4.

This 5-bushing set covers most bottleneck cartridges from .17 Remington through the belted magnum family, making it an economical way to add new calibers to your reloading bench without investing in separate tools. Each bushing inserts into the comparator body (sold separately) and indexes the case shoulder consistently, so your calipers read true every time. Whether you're fine-tuning a new die set or troubleshooting inconsistent chambering, these bushings are the gauge you'll reach for.

The Hornady Lock-N-Load Headspace Comparator Bushings (5-count pack) are essential for any serious handloader who wants precise control over case headspace. If you already own the comparator body, this bushing-only set lets you expand your capability across multiple cartridge families without buying a complete new gauge. These bushings work with a dial or digital caliper to measure the distance from the case head to the datum line on the case shoulder—the critical dimension that tells you whether your sizing dies are dialed in correctly.

Proper headspace control directly affects brass longevity and safety. When cases are oversized, headspace creeps forward with each firing cycle, cutting the usable life of your brass and risking pressure spikes or difficult extraction. By measuring actual headspace changes between fired and sized cases, you can fine-tune your sizing die adjustment to fit your chamber precisely, not some factory standard. That's the difference between cases that last 8–10 reloads and cases that barely survive 3 or 4.

This 5-bushing set covers most bottleneck cartridges from .17 Remington through the belted magnum family, making it an economical way to add new calibers to your reloading bench without investing in separate tools. Each bushing inserts into the comparator body (sold separately) and indexes the case shoulder consistently, so your calipers read true every time. Whether you're fine-tuning a new die set or troubleshooting inconsistent chambering, these bushings are the gauge you'll reach for.