Actually in the Bond novels, he uses a .32 caliber PPK after M took his .25 caliber Beretta away from him.
Them were the good old days when criminals were brought down with a .25.
Now they warn CHL holders that even 9mm+P hollow point does not do the job. You can’t trust anyone these days.
Correctamundo, for the most part (the Walther made its first appearance in the fifth novel). And remember that Bond was "the best shot in the Service," and that he had used the Beretta successfully for more than 15 years before having it taken away (due to it getting stuck in his pants, with a silencer on it, at the end of "From Russia with Love" while trying to shoot Soviet Col. Rosa Klebb in a Paris hotel room). He hated to lose the Beretta, even though he knew that the Walther was a superior weapon, a "real man-killer" according to "Q".