Checking headspace on a rimless 300 Blackout chamber calls for a precision gauge like the Forster 300 Blackout GO Headspace Gage (Forster part no. HG0300G). Headspace, the distance from the breech face to the cartridge base with the action closed, directly affects both safety and accuracy; too much of it risks a ruptured case and gas blowing back toward the shooter. Forster builds this gauge to tight, repeatable tolerances so it gives a reliable go/no-go read on the chamber.

Key Specifications

• Chambered for 300 Blackout, rimless case type.
• Gauge type is GO.
• Overall length is 1.079 inches.
• Manufactured to exacting, repeatable tolerances for a reliable go/no-go read.

Frequently Asked Questions

What does a GO gauge tell me? A rifle chamber that closes on a GO gauge accepts ammunition made to SAAMI industry-standard specifications, confirming the chamber is not cut too tight.

What is headspace? Headspace is the distance between the face of the breech and the base of the cartridge when the action is closed; excessive headspace is a safety and accuracy concern.

Buy the Forster 300 Blackout GO Headspace Gage

Order the Forster 300 Blackout GO Headspace Gage from our Lubbock, Texas gun shop, and we will get it packed and shipped to your door quickly and insured. Browse our other reloading equipment lineup for more chamber-checking and case-prep tools.