I think the general consensus of "high capacity" is more than 10+1. That's not my opinion of what it is, but I believe that is the ATF's definition. It also seems to be the media's definition (the ones who don't just give you a blank stare when asked). Also, the gun does have something to do with it IMO. You're not going to get 15+1 in an ultra compact 1911 in .45.
"When a strong man, fully armed, guards his own palace, his goods are safe."