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**Mike Irwin** · June 13, 2012, 07:07 AM

My guess? And I'd bet hard money on it?

7mm TCU.

Case dimensions are VERY close to what you're reporting. Given the head size and rim diameter it's based on the 5.56/.223 case.

http://www.google.com/imgres?imgurl=...ed=0CBcQ9QEwAg

June 13, 2012, 07:07 AM	#10
Mike Irwin Staff Join Date: April 13, 2000 Location: Northern Virginia Posts: 41,389	My guess? And I'd bet hard money on it? 7mm TCU. Case dimensions are VERY close to what you're reporting. Given the head size and rim diameter it's based on the 5.56/.223 case. http://www.google.com/imgres?imgurl=...ed=0CBcQ9QEwAg __________________ "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.