Not necessarily C&R and not necessarily milsurp, but don't forget about .22. I'll bet that I've put more .22LR rounds downrange than all of my other calibers combined.
Also very true!
One of my all-time favorite C&R purchases was a Winchester Model 69- one of the early non-"A" 1930s models with the cock-on-closing bolt. It's pretty, it's refined, it's a tack driver, and it lacks the plastic parts and other cheap touches you find on new .22s. OK, you can't mount a scope on it without hacking it up, but it's a .22, who needs a scope?