The 5.7 case looks a little bigger in diameter, but it might be because it's positioned slightly closer to the camera. I guess you would have to form both into a wildcat with the same shoulder location and angle, and then determine the case capacity.
Other unseen differences might exist such as ease of resizing. I recall you had some problems with the Velociraptor that required an insert for the primer hole in the shell holder.
I have no idea about the strength of the case.