I/We, hunt crows when the season is in and it's a whole bunch of fun and very challenging. Crow are "extremely" smart but very predictable. I mostly hunt alone but when our group of three gets together we have a strategy. You need one or two callers and switch back and forth between two basic calls. When I hunt alone and get the first one on the ground, I can get them to keep coming back. You have to wear camo, be still and patient. Those sight you mentioned, are good and that is how I got started. ...
Be Safe !!!