BB - you are correct. The .44 Special is built on the smaller .357 frame.
Now if you really want a sweet Ruger .44, get an original .357 Flattop and have it converted to .44 special. It will cost $700.00 plus dollars, but it is worth penny. The benefit is a single action that is lighter than a .357 but packs a whole lotta punch!
There are times when I carry mine as my CCW gun. I also carry my .45 Colt Blackhawk. They are just as easy to conceal as a 1911, but there are times when it just feels right. The whole .45 Colt / .44 Special arguement is moot where this is concerned. Yes, a 45 Colt can be loaded hotter than a 44 Mag, but it is not a custom .44 Special. When it comes to Ruger Blackhawks, they are all fun (this is not counting the one above)!
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