Quote Originally Posted by tammons

No reason to use a 20 moa base unless you will be shooting to 1000 yards.
Wouldn't this depend on the scope used?

I have a Nightforce on My FN-AR that barely gets to 650 on a flat base, the scope has a HUGE amount of elevation compared to most mid priced scopes.

I tend to use 20's on everything, except the 110BA it has a 40.