Re: 7mm BR
the yardage mentioned by Ernie is realistic. 7br puts out a 140g bullet @ 2200fps. IHMSA issued some in 7-08 and 7IHMSA rechamberings. these have a little more oomph. Cabela's.com and gunbroker are places to look. The cabelas store in UT had one in the gun library last time I was in there.
contrary to the beliefs of some who offer XP-100s for sale, they are NOT extremely "rare" items. Use patience. I have picked up serveral in 2010 at $650 or so. These were all in the various 7mm chamberings in the open regional and national market. Stock 7BR XPs are NOT worth $800.
factory 7BR XP100 will be mild recoiling. It will shoot at one MOA. I have seen many that will do half of that. 250yd on deer, amuc farther on targets.