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Unread 02-14-2013, 11:18 AM   #3
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Kensal Rise
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The major issue in lengthened forcing cones in double guns is the removal of metal where pressures are highest. If lengthening takes too much metal out of the barrel, it's bad. If there is enough to maintain safety, then a longer cone will generally lower pressures.

The Parker site's FAQs has a very valid discussion of this under the topic of barrel thickness.

Best, Kensal
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