"Hence the .45 ACP I lug along in the glove compartment."
I wouldn't ming having a M11911A1 like yours. Always been a big fan. Right now I keep a Glock 22(.40 cal). I like it too, though.
I got a good deal on it. I had a Glock 19 I bought from a friend several years ago that I never shot, and about a year ago, traded it plus an additional $125.00 to get the .45.
Hit something with a .45, it goes down and stays down.
Bang.......
Splat...........
Clunk..................