300 Win Mag Headspace Gauge

Can you reference the above picture please?
A good magnet with a stainless, non-magnetic cup around it, or you'll just attach to the sides of the chamber.
You could try the magnetic tip on the end of a scribe to see for yourself if you have steady hands
 
Once set, remove rifle from vise, tilted rifle back and opened bolt and gauge just fell out for me. I use PTG gauges though instructions were from Foster since I can't find my PTG instructions easily...yet.
 
Update:

Forster - Not necessary to remove the extractor on the belted gauges. That is indeed an extractor groove on the gauges.

Northland Shooters - Chamber too small in area just ahead of the belt. Polish/remove .0005" material. No warranty.
IMG_9969.jpeg
 

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