ORIGINAL: M77man
The lead sled is only good for testing out the rifle to see how accurate it is. Take away the lead sled after you've determined there is nothing wrong with the rifle. Now, work on the shooter.
Sorry about the simple explanation.
I think many people use one of those whenever they shoot. Sure, I could get much smaller groups using one as well. However, I dont see much challenge in it. Maybe to use just to sight in.
I occasionally get a group under an inch, but most are an inch or a little more. Howver, just shooting using anything as a rest... lol