I have to agree with WesternSky 18-22", if it's a big bodied mature buck and the antlers are out to it's ears then figure it's a 22" rack with an inside spread spread of atleast 1-1/2 inches shorter--at best! If you're measuring for B&C or P&Y you have to take the inside spread of the main beam which can be(and usually is) a whole lot less than the G2's, G3's, and G4's.