Ok guys , again I want to thank everyone for all the info and encouragement. I'm soaking it all in. I now have gathered 10 boxes of ammo. I am heading out to the ranch Saturday morning. I'll shoot 3 to 4 bullets out of each box. So 30 or 40 shots. My question is how long should I wait between shots? Should I shoot 4 shots of one box and wait 5 minutes ? Wait 10 minutes? Don't wait at all and just shoot 'em up? My thoughts are a cold barrel will give a difference chrono MV than a hot barrel. How should I go about this?