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After a little research, 50mm is the size needed for elephants, rhinos, hippos, etc. Anything smaller just bounces off and makes them mad.
@sdgathman @freemo Actually, I think that is 50 "caliber" - which is really hard to find a definition for. However, it seems to be .50 in. I.e. 127mm instead of 50mm - more than twice as big.
