I usually install a scope by leveling the rifle with a 6" level placed on the base. Hang the scope loose and line up the vert. hair on a colored line attached to a plumb-bob at 100yds BUT was curious about accuracy of my level. I tested 3 levels, a 6" El Cheapo, a 6" Stanley and a 4' Stanley alum. framers level using an angle meter made by Central (used for setting up drivelines). I found some interesting things: The El Cheapo and the 6" Stanley show dead-on (assuming the Central guage is accurate). The 4' was about 1/2 a degree off (again the assumption) but what I found most interesting was the tremendous sensitivity difference among the 3. When I moved the 6" Stanley 1 degree the bubble went clear off the scale, a 1/2 a degree even appears severe. The others gave obvious changes but not nearly as severe. This made me feel pretty good that this is the one that I have used for scopes, always fighting for that last nano-hair of level. So what is level to you 1000yd pro's? What edquipment you use? Is your technique or method similar?