The choke you use has the most impact for close stuff a 1/4 improved cylinder or half a modified and when you stretch out a 3/4 improved modified or full with lead 4shot 32grm is a good all rounder. As said short barrels don't swing as nice and you really have to watch the bonnet etc when shooting of the back and the muzzle blast will be louder because it will be right there and rattle around in the vehicle
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