Thanks man, really appreciate it, thats what I'm looking for, just wanted to make sure that is exactly what I need to fire directly off of a bench. When you mention shims, looking at their products, looks like they offer the same bags with a heavy bottom which is wood on the bottom of the bag, wouldn't that level the bag? Do you use anything to make sure you rifle is level or do you just eye sight it? Thanks again.

Also, anyone used the Caldwell tack drive sand bag? Its just one bag but not sure about it yet.