He is. But assuming that he is super-prepared, beyond the abilities and equipment we've seen or been given reason to postulate, results in an unsolvable puzzle. Someone as intelligent, experienced, prepared and resourceful as Voldemort could theoretically have a counter for anything we can come up with.
We know or can reasonably assume that he obtained a gun specifically as a solution to the problem of not being able to injure or kill Harry with magic. We don't have any reason to believe that he has prepared further, backup solutions to that specific problem.
There's one thing for which it's genuinely impossible for V to have a counter: the realization that killing Harry is not in his interests. Speaking in Parseltongue, bound by the Vow, Harry is uniquely prepared to make that case -- assuming it's true.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 113.
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
IMPORTANT -- From the end of chapter 113: