1st centerfire revolver for both home and range
any full frame full weight S&W or Ruger, new or old model (there are no bad choices in any of those, just personal fit and personal preferences), 38/357 caliber, DA/SA action, 4" to 6" barrel length, adjustable sights desirable for more varied range fun and/or hunting
Extreme versatility in both choice of ammo load and shooting style, fast or slow, SA or DA mode of choice, mix-n-match targets, loads, target distances.. you can do it all with just one revolver
357 loads are plenty enough to adequately defend against anything that routinely walks on two legs, and most things that routinely walk on four legs.. and 38 loads are inexpensive and versatile in their own right
Leave DAOs and snubbies and lighter-than-air for if/ when you decide to 'specialize' on a CCW revolver
Leave shotshell handguns to watermelon hunters
Unless your real name is Bob Munden, leave SA shooting mode defensive tactics to shooting 1911s; SA revolvers are not 1911s, as has been well explained in numerous posts by others above. Why anybody would dispute that is just one of cyberspace's minor mysteries.
PS
a Ruger Blackhawk (any caliber of your own preference) would make a fine general purpose 'ranch gun', it would, no dispute.
Just nowhere near the versatility of a full frame/weight 38/357 general purpose DA/SA revolver
Half the fun and skill building in revolver shooting is very much about double action shooting