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**Mike Irwin** · November 13, 2013, 09:37 PM

The most important role of the rim on a shotshell is to maintain headspace. If you don't have a rim, you either have to headspace on the case mouth, which is extremely problematic with a shotshell, or you need to have a shouldered shell, which brings its own problems with it.

November 13, 2013, 09:37 PM	#2
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,389	The most important role of the rim on a shotshell is to maintain headspace. If you don't have a rim, you either have to headspace on the case mouth, which is extremely problematic with a shotshell, or you need to have a shouldered shell, which brings its own problems with it. __________________ "The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza Baby Jesus cries when the fat redneck doesn't have military-grade firepower.