In The Classroom: Headspace Part 2

Dunlapby Bob Dunlap
AGI Instructor and Master Gunsmith 

In Part 1, Bob showed us different headspace gauges and what they are for. Now he demonstrates the correct way to use them. If you work on rifles, or even if you reload and are having head separation problems this is handy knowledge to have.

4 Responses to In The Classroom: Headspace Part 2

  1. Great detail on accurate measurement and shell cases. Most folks never go beyond the go/no go test without thinking the cartridge is manufactured short or even long.

  2. Similar method: I cut a set of 0.450″ diameter feeler-gage-stock shims to do the testing for testing headspace with cartridges. These are used after doing the basic SAAMI-sized “Go” and “No Go” gage tests for bolt closing. The disks are in 0.002″ increments.
    Whenever I see excessive headspace with cartridges, the disks can be stuck on with grease to the heel of the cartridge and tested one-by-one to get the actual headspace on those particular cartridges. Your masking tape idea is pretty much the same technique, but the tape is kinda squishy and not so accurate a measurement as this steel or brass shim method.

  3. Great series learned a lot and can now comfortably re barrel a rifle with the knowledge needed, thanks Bob as always instructional and practicle!

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