Yankee Deer Hunting regulations that do not allow some of the longer rounds, thou straight walls is one of the primary reasons, thou not the only reason & yes you can get a bolt gun cheaper yada yada but some may want a Number 1 to Deer hunt in one of those places.
Here is a thread about this matter, no need to beat it to death again:
http://www.rugerforum.com/phpBB3/viewtopic.php?f=4&t=253288