I haven't seen too many different makes of 55gr bullets, but I know there's a definite visual difference between the Lake City and Hornady 55gr FMJBT bullets I have. The lead at the bottom of the Hornady bullets is smoothed to the edges of the copper, almost as if the lead was poured into the copper and formed a miniscus before cooling. The Lake City rounds are rougher at the base and have a sharper edge between the lead and copper, as if the copper was forced around the lead (with a ity bitty copper lip protruding beyond the lead). Unfortunately, I don't have any other rounds to compare with, but those are the most common 55gr bullets around, so use the information as you wish.