[krept]

I could be wrong, but I believe that the 5.45 bullet is a tad bit longer (pic is down) than the 5.56, although the weight might not indicate this. To look at the above pic of the 5.45 wound cavity is really laughable unless they were comparing the lead core 5.56 with the 5.45 steel core rounds. Yes as shown they do have hollow points and will significantly loose stability when penetrating even an empty can.

The (apparent) length of the 5.45 even without the hp cavity i believe would make it more prone to fragmenting at the cannelure much like the 5.56.

I conversed with a guy that has dished out and seen the effects first hand of the 5.45 in combat and he said that without a doubt, you get hit with one of those, you are going to be maimed for life at the very least.