I do something similar but costs very little. 2 years ago, I purchased a plastic tool box from Wal-Mart and put all of my muzzleloading equipement into it. Including powder, bullets, tools, flasks, flints, etc.. I also placed into it a small bath towel. When I go to the range, we have seats and tables, so I place my tool box at the end of the table towards the target. Than I place the small bath towel on top of the tool box. I use this towel and tool box as a rifle rest and shoot from there. I like this better than using the gun vise I have. I can hold the rifle fairly stable this way and determine where my shots are going. It's similar to when I out in the field but without the towel. Although, when I go hunting, I bring the tool box and leave it in the truck. This way if I have a problem or need something, I only have to return to the truck to get it.

T