around here (cent PA) they are 40ft at a 6x6 cardboard square most bb's wins round.
most people use pumps,tight chokes,and squib loads barely enough to go through the target.
i remember my brothers used to shoot them. first time there they took full house fox loads,they got the stink eye everytime they got up on the line
we spent that whole summer working on lighter loads ,i was 9yrs old and did most of the test shooting lots of fun and a bruised shoulder that lasted 3mos