LOL Yes, I expect you are right! I chose the 505 Gibbs on a CZ 550 action simply out of simatry and personal nostalgia. A big 5 gun with all of those 5's, why not.
I fully understand what you are suggesting about the mauser action, and parts availability. I built a .458 win mag last spring on a Husqvarna action. The gun smith laughed at me when I took it in. He was not interested in getting involved. So through ebay and other gun parts sites I found everything I needed and put it all together. It is rough in some areas, and beautiful in other areas. All in all it came out well, and functions beautifully.
I have already located actions, barrels (had to have a barrel made for the 505 Gibbs), and most everything else, for my current projects. I have not decided on stocks yet. I'm leaning towards a laminated stock. I kinda enjoy the search for the parts, a little bit. It does get frustrating at times.
Anyway, I really appreciate the encouragement. Thx