I've been shooting and hunting for a very long time. I shoot competitive (NBRSA) 100/200/300 benchrest with a 6PPC. My longest hunting shot to date was on a nice mule deer at 325 yards with a 30x338. In the past, when I've been faced with a long shot (300+) I've simply made an educated guess were to hold. I want to get serious about building a custom LRH rig and learning the techniques needed to become proficient hunting at longer distances. I've set 600 yards as my maximum limit. In AZ, I would really need to work at getting a shot in excess of 600. Accordingly, I'm thinking of going with a 243 AI with the following goodies. Berger 6mm 105 Grain Match Target VLD Lapua Brass Accurized M700 Action Krieger Fluted Barrel McMillan A-3 Stock Jewel Trigger Nightforce 3.5-15 x 56 NXS Mil-Rad Zerostop Some may think I'm undergunned for elk with the 243 AI; however, I've believe that a well placed 105 pill will anchor an elk very adequately out to 600 yards. Let me know what you think and your opinions. Thanks.