Caldwell Lead Sled Weight Bag $14.95

[Omega]

If you use a lead sled, these bags can't be beat. I load them with lead shot, and it absorbs the shock of the shot without transferring that energy to the stock, or your shoulder. I first used a steel plate on my sled, and there was a noticeable difference between the two methods.

https://www.preppingdeals.net/deals/amazon-4-pack-caldwell-lead-sled-weight-bag