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Parker guns in 12 and 16 gauge that were made to shoot paper hulls generally had 2 5/8" or 2 9/16" chambers with conical forcing cones. They were chambered this way in the belief that by doing so a better gas seal was created where the forward 1/8" or so of the paper hull would be pinched in the cone as it opened upon firing.
The Following User Says Thank You to Dean Romig For Your Post:
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