Lots of shotguns have burst firing capability.
Shotguns can also use shot (flechette) ammo with choke.
Are the target's dice penalties for both choke shot and burst fire stacked together? Seems like they should since nothing appears to say they don't stack, am I missing something? Granted, given how good armor is in the 6th World you'd just likely be wasting a lot of time vs any kind of armor, but if you had an unarmored target, can you get him to -14 dice on the dodge?