I think prob standard .177 cal(which iirc are pellet and copper BBs)... Plastic Airsoft are actually bigger than normal copper BBs which I found interesting....only cause i tried to fit an AS one in my Pellet gun and they are too big...they dont even go in the barrel...it sucks.
But you also have to remember, this is in the year 2250 so Cal of BB may go up in 200 years as well...they may be now Plastic BB size....maybe even pea sized...even bigger.
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But you also have to remember, this is in the year 2250 so Cal of BB may go up in 200 years as well...they may be now Plastic BB size....maybe even pea sized...even bigger.