Ya, have 2 Ruger II .380's ( one is wifes ). You are spot on with the HMR, 200+ yards with no wind and @ 2600 fps pretty flat. I think that I remember something like a 1.5 inch drop.
Bigger IS better for stopping power. I would not use a .45 or .40 for a Bear, but a people - no problem. Ya just got to remember that the bigger bores shoot bigger bullets and they slow faster. So at 5ft to around 20ft you are good to go.
While we are at it, I just watched a news clip out of Philly - couple of guys pulled into a service station got out of their car with AK's ( looked like anyway ) and gunned down another guy filling his van. Multiple rounds fired by both guys. Broad daylight earlier this morning.
There have been record gun sales for ...what... the last 3 years. I guess that the $Million question is: When are all those folks gonna start fighting back and protecting each other. Gun fights in the street are not anything I want, but something has got to give.