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243winxb · March 11, 2013, 06:59 PM

The Full length die may not need to contact the shell holder, when sizng, for the sized case to chamber correctly. When i was forming 7mm TCU out of 223 brass, the above applied. Forming dies push the shoulder back more than a FL die to account for the brass case's tendency to spring back after sizing. As for the shiny ring, it could be the start of case separation. I have had 223 brass separating in the lower part of the body. A bent paper clip is used by some to feel for a groove inside the case.

March 11, 2013, 06:59 PM	#2
243winxb Senior Member Join Date: July 26, 2011 Location: USA Posts: 1,730	Forming vs. Sizing The Full length die may not need to contact the shell holder, when sizng, for the sized case to chamber correctly. When i was forming 7mm TCU out of 223 brass, the above applied. Forming dies push the shoulder back more than a FL die to account for the brass case's tendency to spring back after sizing. As for the shiny ring, it could be the start of case separation. I have had 223 brass separating in the lower part of the body. A bent paper clip is used by some to feel for a groove inside the case.