Here's a response to this question I got from Stacey:
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Hmm, let's see. The gun is targeted at you. That's a good target to choose. Those are both okay.
In general, I'd guess that "target at" should be followed by a noun ("at" is a preposition) and "target to" should be followed by the infinitive form of a verb ("to choose"). I don't know whether those would be universal rules or just "often but not always." (Though, in English grammar, it seems there's an exception to just about everything if you look long enough!)
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I haven't released the updated flashcards yet for download. Another member noticed an issue with the formatting of these cards, which I'm trying to fix.
Thanks!