The Hornady .350 Headspace Bushing (Hornady part no. B350) is a caliber-matched insert that fits Hornady’s Lock-N-Load Headspace Gauge and comparator body, giving handloaders a repeatable reference point on the case shoulder for measuring headspace and shoulder bump. Made by Hornady, this bushing threads or seats into the gauge body and contacts the case at a consistent point on the shoulder, removing the guesswork of measuring an irregular case mouth or neck. Precision rifle reloaders use it to keep shoulder bump on full-length sized brass in a narrow, repeatable window instead of over-sizing and shortening case life. It’s a small accessory that makes a real difference in how consistently your resized brass chambers.

Key Specifications

• .350 inch is the reference diameter this bushing is ground to match.
• Works with the Lock-N-Load Headspace Gauge (comparator body sold separately) to give a repeatable shoulder-datum measurement.
• Consistent shoulder-datum contact point removes the variability of measuring off an irregular case mouth.
• Hardened steel construction holds its ground dimension through repeated measurements.
• Reusable for every sizing session once matched to your case and chamber.

Frequently Asked Questions

What does a headspace bushing do? It gives the Lock-N-Load Headspace Gauge a consistent contact point on the case shoulder so you can measure headspace and shoulder bump repeatably.

Do I need anything else to use it? Yes, the Hornady Lock-N-Load Headspace Gauge comparator body, sold separately.

Buy the Hornady .350 Headspace Bushing

Order the Hornady .350 Headspace Bushing from our Lubbock, Texas gun shop for fast, direct shipping to your reloading bench. Browse our full lineup of reloading dies to round out your case-prep and measuring tools.