10ga with TSS would be a 100 yard gun. Back in the day, we killed geese at 125 yards with T lead shot.
On another note, my 12ga Rem 1187 with factory extra full choke patterns Rem 3" mag, 42 pellets of #4 buck, 100% in a 20" pattern at 40 yards, with 00 and 000 Rem 3" in a 15" circle at 40 yards.
These patterns on on the verge of being too tight.
Working with chokes can pay huge dividends with std lead buckshot.
Consult you Tube:
Bubbaroundtree outdoors for advanced buckshot reloading, techniques and loads, they are impressive.
For years, I hunted with a guy that loaded his on 12ga in a old Winchester AA hull with 24 pellets of Hard cast #4 buckshot from Ballistic products, At 1300 fps. He shot an extra full choke, and the boy could shoot. It was rare that he missed one, and in the shotgun territory we hunted in, 50 yards was a long shot. He used to make fun of my
1 -5/8 oz buckshot loads at 1300.
The key to all shotguns is to pattern at 40 yards from a supported position. Gun fit may cause you to shoot low, high, right, or left of the point of aim. I shoot 12" low with all Rem shotguns, so I run a Burris speed beade on the guns...easier than dealing with gun fit. My Beretta 390 and 391 had stock shims that came with them so I could get proper gun fit/ with point of aim matching point of impact.
Kicks Butt kicker chokes are incredible also in patterning at a distance with custom reloads with hard cast Buckshot.
Lee makes a great #4 buck mold, Sharpshooter, and Marty makes great buckshot molds.
Nothing will top TSS in patterns and killing ability, nothing. I just do not shoot coyotes at distances that would warrant the expense.
Bubbaroundtree has you tube video's of a LOT of patterns shot at a distances from 60-100 yards. With lead, you have to go up a size as distances increase, where you do not with TSS.