I'm of the thinking that both settings use magnetic. I've had torpedoes set to contact only and had them blow up prematurely (which I believe to have been a problem with mags) and I've also had Contact/Influence do the same.
Strange thing.. I haven't been getting holes blasted in the sides lately when I have them set to Contact even though the target is listing and dead in the water. Gonna have to check on the dual setting too.
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