The Forster Headspace Gage for 300 Blackout, Field length, 1.085 inches (Forster part no. HG0300F) gives gunsmiths and handloaders a reliable way to check the maximum acceptable chamber length for this rimless cartridge. Headspace is the distance between the breech face and the base of the cartridge when the action is closed, and excessive headspace is a genuine safety concern, since unsupported brass fired in an over-length chamber can rupture and send gas blasting rearward. Forster machines this Field gage with painstaking care and exacting tolerances to give an accurate reading on your 300 Blackout chamber.

Key Specifications

• Checks the maximum acceptable (Field) chamber length.
• Measures 1.085 inches.
• Machined with exacting manufacturing tolerances for accurate readings.
• Built specifically for the rimless 300 Blackout cartridge.
• Helps catch excessive headspace before it risks a case rupture and dangerous gas blowback.
• Sold as one gage per package.

Frequently Asked Questions

What does a Field length gage check for? It checks the maximum acceptable chamber length; if the bolt closes on a Field gage, the chamber may be worn beyond a safe headspace limit and should be inspected further.

Why is excessive headspace dangerous? Unsupported brass fired in an over-length chamber can rupture, sending gas blasting rearward, which is a real safety hazard in addition to hurting accuracy.

Is this gage only for gunsmiths? No, many handloaders keep one on hand to check a rifle’s chamber themselves, especially with brass of unknown firing history.

Buy the Forster Headspace Gage, 300 Blackout, Field Length, 1.085 Inch

Check your 300 Blackout chamber against the safe maximum with a precision Field-length gage. Order it from our Lubbock, Texas gun shop, where our gunsmithing tools selection stocks Forster headspace gages across popular calibers, with fast shipping to your door.