http://en.wikipedia.org/wiki/Shotgun
Hmmm, doesn't sound right. Accuracy would greatly suffer.
"Use of a smooth bore shotgun with a rifled slug or alternatively a rifled barrel shotgun with a sabot slug improves accuracy to 100 m (110 yards) or more. This is well within the range of the majority of kill shots by experienced hunters using shotguns."
It is more than likely two different weapons and possibly two different shooters.
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