.408 CheyTac, 10.36mm x 77mm, One Cartridge, not a box.
For more information, please see below.
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One Cartridge , Not a Box: .408 Chey Tac* for CHEYenne TACtical newer production using new Peterson brass with “PETERSON .408, 10.36x77mm“ Head Stamp loaded with 419 grain “Balanced Flight Bullet” projectile, and new factory cone bullet crimp on case neck.
History of the .408 Chey Tac*) cartridge:
This cartridge was developed in 2001 by Dr. John Taylor to fill the gap between the 338 Lapua and 50 BMG for the U.S. Army.