My thoughts on #4 would mirror bamaranger`s. In Ohio, around the mid to late 60`s, the Franklin Co. Sherrif`s Dep. went to #4 buckshot for reason`s explained similar to what bama suggested. Another reason was the fact that during a discharge in a close quarters dwelling (apartments etc), the powers-to-be felt the lesser penetration factor would be a better thing.
To date I believe they`ve went back to 00.
IMO, #4 buckshot will do the job in close quarters and should be used if your worried about over penetration. If not worried, use 00.
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