This is the trend in law enforcement also. Since the FBI shootout in Miami in 1989 almost everyone has gone from .38 and 9mm to .45 or .40 cal pistols.
Bigger bullets are great but it is all about shot placement. a round from the little .380 I carry off duty through your eye is better then a .45 round over your head.
"The difference between genius and stupidity is that genius has limits"- Darwin Awards 2003