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For rub, combine chili powder, coriander, brown sugar, paprika, dry mustard, salt, garlic powder, and cayenne pepper in a minute bowl. Sprinkle rub over roast and rub in with your fingers.
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For a charcoal grill, arrange sizzling coals spherical a drip pan. Test for medium-excessive heat above the pan. Dilemma roast on grill rack over pan. Disguise and grill for 60 to 75 minutes for medium-rare (135 levels F). (For a gasoline grill, preheat grill. Nick heat to medium-excessive. Alter for indirect cooking. Dilemma roast on a rack in a shallow roasting pan; roar pan on grill rack over the burner that is turned off. Grill as directed.)
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Take meat from grill. Disguise meat with foil; let stand for Quarter-hour. Temperature of meat after standing needs to be 145 levels F.