No, it's a Stan Baker set so there are 3 separate shafts that will read 12,16,20,28,and .410. I don't know why 10ga wasn't included.
The largest head will only read to .770 so checking the chamber and getting an accurate read on forcing cones isn't possible. I use my digital micrometer for chamber dia. which seems to work well right at the mouth of the chamber.
Please post the DGJ article.
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