
   I 
almost got lucky on fleaBay buying some used Polychokes, but somehow missed on them! (bad timing it was).  However the used items do exist.  
  But KISS works too!  Even a cylinder bore (that's cut straight). 
In your travels, what ranges "work" for you? 
Please understand GCrank I find your postings informative (almost always) and repsect your knowledge and experience! 
My question about ranges, I find that less-is-more oftimes, and when using a specialty gun - often calls fo a little finesse to really use something well.  So ranges might indeed be shorter when [carefully] selecting "shots!"  
  Also one of my projects is building my Handi-Survivor, in a 12gauge! (and not a .308, not a .223, nor .30/06, nor .357/.38Spl, nor .410/.45Colt, etc). 
I'm building a 12 gauge!  (also as much because of the specialty ammo I'll store with it). 
But I don't know if i'll leave it cylinder bore at 19 or 20 inches; or maybe install a polychoke.  
  The ammo will include some bruiser 3inch bear-slugs (and some Managed Recoil forsters), some Dead Coyote buckshot, but also some 1oz 2" #7 1/2 loads!  And some 2" red meteor (boating) flares I'm reloading/rebuilding, too.  My goal is to have a self-contained piece (for grab-N-go).