Hornady Varmint Express 12g 2.75" #4 buck w/Versatite(Flite Control wad) with a Mod or IC choke. There's 24 pellets of High Antimony lead(vs 27 in typical #4 Buck loads) and no buffer to increase the velocity to 1350fps. They pattern well(because they deform less with tougher lead) out to 75yds and pass through at the the same distance in all but bone hits. All have dropped on shot inside 50yds for me over the years and I've killed a couple beyond 75y that didn't make it far. FWIW I had a consistent 6 pellets inside 10" and all 24 inside 36" circle at 50 yds with MOD choke. IC gave me 5 in 10" and again all inside 36" but was a little more even.. The Versa-tite is a direct copy of Federals Flite Control Wad. If you try to over-choke it beyond Improved Mod..you'll force the shot out of the shot cup prematurely and blow your pattern out. This is good idea if your shots are always inside 50y. I was trying to kill dogs that hung up in the 75yd mark inside timber when they began getting wise. I would kill them at 75 -90yds when they came to bark screech in an arc thinking they were safe..
I've also used their 3" BB (Heavy Mag) coyote loads, and although pattern beautiful at 50 yds, they recoil harder and noticeably less effective beyond that range. If inside 50y I'd go with the 3" BB loads and a Mod choke. If expecting shots or want ability to take them beyond I'd run the 4 Buck loads. As mentioned, I think aside from handloading TSS, the expensive Apex or Hevi's Dead Coyote are your only options for extending your shotgun range.
Of course any 4 Buck, Lead BB or T shot will be a great 2ndary cheaper choice as well, but will cost more to find that "choke" that works best without overchoking it.