Problem torpedo pistols
All German torpedos (the T1, G7a and the T2, G7e; with or without the magnetic pistol) had problems with depth-keeping for several years after the Norway invasion. The depth keeping mechanism was found to leak and not be properly pressurised. The mechanism's pressure was affected every time the u-boat submerged. Thus, the inaccurate pressure in this mechanism made the torpedos depth-keeping very eradic. Some torpedos just dove straight down while others maintained the correct depth as set. IIRC one of the u-boat commanders was able to pin point the problem and it was then corrected.
Another problem was the impact pistol didn't always fire when it struck the target. The US subs had the same problem. A British torpedo was captured and Donitz had the them copy the British pistol.
The magnet pistol was affected by the eradic depth-keeping of course. If it ran too deep under the hull, the ships magnetic field would not fire the pistol. But, the magnet pistol was also affected by the location and mineralization on the planet. There were zones on the planet which required the sensitivity to be adjusted on the magnet pistol. Norway due to its high mineral content was an area where the magnet pistol did not function as expected.
IIRC by the time the T3 torpedo came out, most of these problems were identified and corrected.
From my experience in SH3 with GWX, the magnet pistol seems to work well in calm conditions only. It does not seem that the eradic depth-keeping is factored ito the game.
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