yes, check Smith and Wesson. They have a 50 caliber revolver. I believe so does Taurus.
100-500 USD
Research indicates that the Master Mag 880 was a "house brand" named M500. Check the link below for more information. Yes. The Coast to Coast Master Mag 880 is a Mossberg 500.
Impossible to answer without knowing what your intended use is. Both are useful in a variety of situations.
100-500 USD
100-500 or so
Go to Wikipedia.com and look up the cartridges. They will tell you the ballistics and everything you need to know about the two cartridges. You will see the 500 Magnum is worlds away from the 44 magnum!
10-500 usd
100-500 USD.
50-500 usd
500 USD
50-500 usd
50-500 usd