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Old October 10, 2012, 02:33 PM   #17
James K
Join Date: March 17, 1999
Posts: 24,160
"Step" is an informal but clearly understood term. "Throat" in a chamber is the part ahead of the case mouth, where the bullet sits. The term most commonly used for the "step" in a chamber for a cartridge that headspaces on the case mouth is "shoulder" or "headspace shoulder."

Jim K
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