Ehhh, Matt Helm used a 22LR Colt Woodsman, which is WAY more realistic than anything I ever read in Fleming's books. Too many James Bond movies would have been a chapter in a Matt Helm book, in which Helm killed someone and ended the plotline.
I've seen WWB .32 ACP and .25 ACP at Wally World, in CA that makes them practically mainstream. I'd MUCH rather have a 22LR than either of those benighted calibers.