you say close yardage so i' m going to assume 30 yards or less.try the 28 inch mod choke barrel on paper and see how it patterns,then try the 28 full choke.i have found the the 30 full tends to tear them up a bit at close yardage.now if your think you might have to reach out there 40 to 50 yards then the 30 full maybe the ticket.don' t limit yourself to just buckshot,try other combo' s like #2' s,#4' s.sometimes the smaller shot size will pattern beter then the big stuff.#4 being the smallest you should go on coyotes.for years i used the little bead at the end of the barrel but awhile back i installed fiber optic sights and love them.there especially usefull at night with lights.i once sat down at the range and test fired at 30 yards two barrels,both 28 inch mod choke barrels one fixed one screw in.i used a bufferd magnum #4 turkey load for this.i found that the fixed choke barrel concistanly patterned better then the screw in choke barrel.i really don' t know why,they should have been basicly the same.the screw in one was always high and to the left slighly.who knows maybe the barrel was bent slightly.this is why its so important to paper test any combo that you want to use.for me i use a 28 inch vent ribbed mod choke barrel mounted on a rem 1100 topped with fiber optic sights(red) for all my close in predator hunting.