6.5mm Creedmoor

The 6.5mm Creedmoor, designated 6.5 Creedmoor by SAAMI, 6,5 Creedmoor by the C.I.P. or 6.5 CM or 6.5 CRDMR for short, is a centerfire rifle cartridge introduced by Hornady in 2007 as a modification of the 6.5 Carcano and the .30 TC, which was based on the .308 Winchester. Wikipedia
 
Bullet diameter.2644 in (6.72 mm)
Case length1.920 in (48.8 mm)
Rifling twist1-8" (203 mm)
Parent case.30 TC
Case capacity52.5 gr H2O (3.40 cm3)
Base diameter.4703 in (11.95 mm)
Neck diameter.2950 in (7.49 mm)