Here's a picture showing two little folding loading stands I made.
One is for a Colt frame gun and the other is for a Remington frame gun.
In use, the support is swung upward like the one at the top.
With the barrel pointed heavenwards, the heel of the butt grip fits into a notch on the lower board. (It has a small block to keep it from jumping out when the loading lever is being pushed down.)
The shape of the cradle that supports the frame is the only real difference between the two stands and its size and shape were determined by a bit of "trial and error" fitting.
Once it fit the rear of the frame I made it a little larger and then applied some green felt to it by using a contact cement like Pliobond.
Because the hinge allows them to fold flat, they don't take up much room in my shooting box.
The only improvement I might have made would be to make the bottom board a bit wider but even as it is, it does a good job of holding the gun while I'm loading it.