For the record here are the Earliest Reilly advertisements mentioning "choke-bore"

1875 - "British Rural Sports"
[Linked Image from jpgbox.com]

1875 - Bradshaw Travel book for GB and N.Ireland (This ad continued for a couple of years) - the "guns bored for extra close shooting or penetration" was Reilly code for choke boring.
[Linked Image from jpgbox.com]


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