Head space gauges and field gauges...

Headspace guages can definitely be had from Brownell's. Either Forster or Cylmer. Both of equal quality. Brownell's doesn't always have the whole set from both makers though. There is no such thing as 'field guages' though. There's a Go, No-Go and Field.
If you're just checking headspace, as opposed to changing a barrel, you only need the No-Go and Field. If you're changing barrels, you'll want the whole set. They run $25 or $30 USD each. You'll need a set for each cartridge.
 
You can get away with just a 'go' gauge in most cases. Stick a piece of scotch tape to the back of it, and voila! No-go gauge!
 
"...I have field gauges..." Still a headspace guage.
"...scotch tape..." No you don't. You have a Go guage with a bit of tape that will compress on it.
 
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