Steve,

Here is a link to the Big Game Rifle Club competition rules here on NE.com, which will lend more explanation:

http://forums.nitroexpress.com/showflat.php?Cat=0&Number=16543

BTW, you can become an international member of the BGRC if you are interested. You may find it a bit difficult to travel to the shooting events, but the club has a provision for submitting your targets by mail if you want to join the competition.

Curl