Parker Bros brochure containing information about "the long range small bore":
"The Small Bore Shot Gun"
They are not necessarily larger than standard frame for the gauge. All other information I am aware of about these guns is modern, about a particular gun and not comprehensive. There is information on this forum occasionally and an occasional story about one in the PP's. The above Parker brochure is the only Parker publication I know about the subject and is interesting for its tables and recommendations about loads and effective ranges. Parker called any of them with 30" or 32" barrels "long range". The brochure covers 16,20 and 28 gauges.
Good luck, its an interesting subject.
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