I am looking to build a practice rig so I don't shoot out the barrel on my 7mm STW so quickly. I would like it to have similar wind drift at 500 as the stw does at 1000 (somewhere in the 4.5 MOA range). not too worried about drop because that is the easy one to compensate for. I am going to put a half power scope (12x) on this rig to help simulate the longer shot. Any suggestions on a caliber to go with? obviously I would like excellent barrel life and light recoil. For more info: Remington 700 in 7mm STW with a 24" barrel and a jewell trigger.