I have a small range next to the house, with a bench and a lead sled. You can shoot very well on the sled. I put on a bi pod and started to shoot with it instead, I noticed that at 500 yds I was 6" low at 600 yds I was 10" low and at 700 yds I was 15" low. Sand bags was few inches better across the board. I tried the other 2 guns and give a inch or two they shot the same way. The calibers used were 6.5x284 7 mag and 300 win mag. This all started because a few weeks back I was using the 6.5 on a doe hunt, I got one at 411 and another at 565, I missed at 735 yds, both does were hit very low so I had to see what was going on. I had no idea that there is that much difference between a bi pod and a bench. Has any one else experienced this ?