I bought the Caldwell Lead Sled Plus last fall and really like it. It can hold bags of lead shot or two 25 lb iron weights which is what I use.

I have been sighting in my newly scoped .22, a TC Encore and Knight Revolution black powder guns and retesting my 30-06. I can shoot all day and not even know it. Like you, I want to make sure my guns are dead on whether I am or not.