Yeah, I have a 6.5 Creedmoor upper for a Aero Precision M5 based rifle (AR10). I've been having trouble with COAL with the Sierra Tipped Match King 130 grain. Sierra's own data listed COAL of 2.810" and I put together some at 2.800" that would jam the bullet into the rifling of this rifle. Quite frustrating to find a good value.