Mike, tell your friend that "older Parkers" were chambered from about 2 3/8" to 4", depending on how they were ordered and how Parker was boring them at the time. Parker Brothers normally bored chambers 1/8" shorter than the shells the guns were designed to shoot. This is proved as fact by documents such as Bruce posted and other factory drawings from Parker Brothers. Burrard's date for the switch to 2 3/4" shells as standard in the US is way late.
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