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A number of barrel micrometers are available. The excellent
Stan Baker barrel micrometer is available from the Shotgun
Sports Magazine’s Shootn’ Accessories.
They sell a CSP Universal four gauge set (no mention of 16 gauge)
for $450, a 12 gauge for $325, and a 12 gauge Short Set for $225.
Drew uses a Skeet’s Shotgun Bore Gauge from Brownells (Item No. 843-200-126) for 12 and 16 gauge for about $90. To
use the gauge, zero the micrometer to 0 using the provided 0.700
ring. The tool is easy to use, but be sure the bore is clean
and re-zero with the ring every time you take a measurement.
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