The range closes quite a bit for various reasons, so that's maybe why the road was blocked when you drove by.
They just added a new webpage for the range: http://www.liberty.edu/campusrec/index.cfm?PID=40621
Looks like it's still only for students, staff, and faculty, which sucks because those prices make me drool. I wish they'd add alumni to that list. I wonder if they'd let you partake as long as you had an LU ID.