I just went down into the cave and did some research on this.
diameter and weights
BB .1735" 5.4 grains
#2 steel .180" 6.1 grains
The BB is only 4% less diameter with 88% the weight of a #2 steel pellet. Corrected for diameter, the density of the BB is about 92% of that of the steel. I'd say that's not too bad Charlie and should kill just fine within some reasonable limit. Haunt the garage sales or wherever and find some old copper BB's for comparison. I'd bet they're heavier. The silvery ones I have here sure feel light.
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