We generally look for a few things when hunting a field for those Ribeyes in the sky. One is the obvious, if they are feeding there then get there if you can. Another is to look for their roost and get decently close but always to the north. If there is a lot of birds on the roost they will take turns going to eat and back to roost or migrate. Also, a good number live birds is the best decoys you can have for bringing down the high-flying migrators. But seeing that may bring in hunters who like to sneak, that is why I hope that people do enough driving around to see if anyone is hunting these birds and not to wreck the decoying hunt. The field doesn’t really matter as long as it is in or around their flight pattern, but like all geese, I like corn, especially if it was a burned field. I don’t know what it is but they love cooked corn.
As for the hunting times I would say that the mourning is probally the low time of the day. Sunny days are the best for migrators and blinding the geese, they see much better on them cloudy days. And if there is a roosting flock around wait them out all night because they absolutely pile out at night and with the liberal shooting times you may get blinded by the fire out of the cannon.
Decoying is all a preference for people, a 40 yard shot is a great take(and about the ave. shot) and some will have their feet down and committ. some just want to sneak and do hard work for the cheap thrill. There is nothing like decoying birds to me, thousands in one tornado, priceless. And you always want to beware of the nuisance geese. These are one or two birds that hang well out of range to warn geese of your spot. They will bring in more birds, but they then may just lead them out to saftey.