Tips for using shotgun units effectively

Solution 1:

Shotgunners have the quickest fire rate of a unit, which is key to using them to your advantage. If they're within range of another unit, say a Machine Gunner, they will get their shot off first and win the battle (but you also need to take into account the other factors that determine the winner: cover, are you moving, are you switching stance, and are you aiming).

As much as I hate camping, they're nice to camp a doorway and cut down anything that walks through it, or walks by a window they're camping.

And like it was mentioned above, they are the quickest unit, so if you're having trouble with a sniper, they should be your go-to unit, if you have any.

Solution 2:

there are great for indoor use. also if you have them wait around a door that you know some one will pass through.

they also walk the quickest of any unit. (well at lest in the last version i played in depth)

Solution 3:

Shotgunners are only useful at close range, this is the most important part. They are nearly unbeatable at close range (baring factors like cover and etc). I find the most effective thing to do with them is to guard doors that the enemy is likely to enter and also to rush and flank the enemy. You might need to force your shotgunners to ignore enemies or 'continue on sight' in order to rush the enemy. If you're not running directly at any enemy, there's a good chance they won't be able to get a good shot off and you can get up close and at that point the shotgunner is probably going to win.