one for when the ***** hits the fan
 one you can carry somewhat discretely
 one to strap on when you can't hide it anyway.  
in .45LC or .41 mag  the only 2 calibers for a wheel-gun IMO.
and I couldn't find a decent pic of a 1903A4,
 but trim away a lot of stock and you have a good 
dependable rifle for when you feel the need to 
reach out and touch something/one.
I've seen fancier guns.  ones that fired more rounds or
 higher ROF, higher velocities, hit a bit harder, whatever.
but there are 4 that, no matter what abuse I put them through,
without fail- go boom when you pull the trigger, 
don't when you don't, and the bullet always ends up
 more or less where I intended.  
those are the three most important things to me.  
the rest of the facts are just for the stat keepers.