ORIGINAL: jeepkid
I've heard that the Lead-Sled causes scopes, mounts, rings, and stocks to break. Especially on the big magnums. All the recoil energy has to be transfered somewhere, so it goesright into the gun. I wouldn't use one on my magnums, small calibers yes, but they don't recoil enough to need a lead-sled. If you can't handle the recoil, either get a smaller gun, muzzle break, recoil pad, shoulder pad, etc... IMO
Why would it cause something on the gun to break? The energy is being absorbed by the weight of the rest, rather than all in your shoulder. I could see an issue if you were strapping the rifle onto the rest, but from what I can see, that's not how the lead sled works.