Thanks, Wayne. I have pin gauges, but I like the idea of getting measurements down to the 16" point. The pin gauges may not even go beyond a long choke. With the Manson gauge, you can also come in 16" from the breech end. By the way, pin gauges and micrometers are a simple way to measure .410 bores, since most of us don't own a .410 bore micrometer.
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