Twelve ga Parker guns were patterned with 1 1/8 ounces of Tatham size 7 shot unless the customer ordered a specific size and charge. "Make shoot as tight as can" is a common note. Du Pont Bulk Smokeless was used in targeting unless the customer had a specific propellant request. l
Meriden Parker chokes were cut with a nut borer "to deliver" the pattern desired. This compensated for variation in bore diameter, and allowed most started barrels to be completed. Bore and choke measurement may or may not predict pattern delivered.
Best, Austin
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