Too get to the point, I'm tired of packing around a heavy 300 RUM everywhere I go on the prairies for miles, but at the same time, its comforting knowing that I have a gun that will perform well out to extreme ranges. I rarely shoot over 700 yards on anything other than steel. I had this gun built a few years ago and its definitely a shooter for sure, but I know there are other options out there. I haven't owned many calibers, but I know there are some great light weight 700 yard guns out there that WONT turn your shoulder to burger after every shot. So, I'm really looking for a light weight rifle, less recoil than a 300 RUM or even a 300 mag, and capable of 700 yard max range on game up to big mule deer. I've had lots of options thrown my way in calibers....... 243, 25-06, 260, 6.5x284, 280AI......etc.. I'm really not sure on what route to take. I know theres some real performance calibers out there. I'm sure all these calibers are more than capable, but this is the place to ask. I'll be having a local gentleman build the caliber of my choice once I decide, and will stick with the NF 5.5-22x50. That's about the most weight I want to add along with the Seekins rings/base. Really want to keep it light. As far as the build, the gun builder will obviously use the barrel contour of my choice, etc......mainly just looking for a great 700 yard caliber that will perform nicely on large mule deer. Thanks!!!