I wouldn't use a 20ga. with steel for chukars. Larger shot size with steel = poor pattern density in a 20ga and lots of cripples, as chukars can be tough birds, especially at longer ranges. I'd go up to a 16ga or 12ga in steel, or reload your 20ga. with ITX shot in #6. If you got a 16ga, you would also have the perfect all around upland gun, especially in areas you can use lead.