OK I have done some research and come up with this:
http://www.nrahq.org/compete/RuleBooks/HPR/hpr-book.pdf
17.5 Courses of Fire for which National Records Are Recognized -
Note: National High Power Rifle Records are maintained for scores fired over the following courses for "Open”,
"Police", "Service", "Civilian", "Women", "Junior" , “Senior” and "Grand Senior" categories fired on the targets
indicated and for metallic sights only unless specified otherwise. The "Service" category includes Regular Service,
Reserve Components, and National Guard
The course of fire we shoot is 17. (ag) which you can find on this link to the High Power Rulebook.
So optical sights are allowed if the course of fire is
for optical sights which our course of fire under 17.5 ag , the basic 50 round NM course, is not