I don't particularly care for the LeadSled myself. driftrider is correct when he says that the more weight you add to it, the less it will move. Simple Physics. The problem I have with the "sled" is that it is uncomfortable for me to work with, and besides it being heavy itself, you need to haul additional weight to pile on it to make it work to full potential. But it DOES move under recoil. Amount of movement is porportional to the total sled weight vs. the recoil factor for the rifle being fired. Although it canreduce the amount of felt recoil a good bit, it's a lot to bother with. I perfer the free-recoil style myself, shooting off a front sandbag under the forearm, a rear sandbag near the stock toe with my left hand on the rear bag controlling fine adjustment and hold. You get all the recoil, but it's much easier for me and more comfortable in position. I respect recoil, but I don't let it interfere with my shooting and load work-up sessions. You have to acheive a "mind-set" about it or you will have a tough time overcoming the fear of it.