Blueprint .50 Action Express On A Blueprint What Is 7.68 Inches?

On a blueprint what is 7.68 inches? - blueprint .50 action express

Welding is a test and had 9.75 7.68 8.50 plan dimensions of 7.68 to 8.50 inches EQUEL know, is 8 1 / 2 and 9.75 IA 9 3 / 4