I have one of these - it has been proven reasonably accurate against better quality gauges, assuming it is used correctly (get repeatable measurements).

https://www.brownells.com/gunsmith-...uges/wall-thickness-gauge-prod20463.aspx

Measure the barrels yourself and post the measurements here along with some pictures and you'll get some good advice on whether it is worth the investment. You can always resell the gauge if you don't want to keep it, but I have used mine on a dozen guns at this point and found it well worth having.

I briefly had a 10 gauge hammer gun, and didn't like finding 10 gauge shells (I don't reload). I sold it. No regrets.

Last edited by Dan S. W.; 07/10/21 07:57 PM.