Been a little while, but chased them hard at one time and had to get better each hunt to be able to kill any. Ideally build a blind of some sorts to keep you hidden. Something where you can stand and shoot while still remaining mostly hidden. Full camo. Face masks and gloves. Keep movement to zero as they come in. A ground blind almost like what you would hunt cranes out of in a field would work, or could use stacked hay bales or tall stakes and camo cloth material (brush it in so cloth not flapping). Could set up on a fence row or with something like hay bales to your back (or in between bale rows). Tall and tight blind would be better than a short and wide. Want them to be able to see less of you as they fly over che king things out. Dont set up under tall trees or they will hang up above trees out of effective range. If on a fence row, pick a spot where the trees are low or a gap. If too close to yall trees, it just wont work out in my experience.
Place decoys out front. E-call out in the decoys with some cover over it. Ideal wind would be at your back or cross wind. They like to turn coming in and land on the wind, so they can hover a min to check things out (then you shoot). Want them to hover just out front of you. Use remote to lower volume a bit as they approach. Blast volume if they are far out.
There is likely a roost somewhere near. If can figure out where, you can have it all set up to get there in the dark of the morning. As they come off the roost and head to your field, you will get several waves/volleys that will be intense action like the wild west. The more you can keep from giving up your position, the longer you will get on each wave.
"Shooting the scout" wouldn't be a concern or really possible. Dont know i was really able to identify any scout, just too much action and maybe something of an old wives tale.? Just keep very well hidden till time to blast.
12ga 7.5 shot with a Modified choke is a good combo. 6 or 8 shot be fine too. I'd opt for 7.5.
Good luck. You might could find some YouTube videos similar to what I've described. Let us know if you can get on them.