The recommended minimum firing distance for torpedoes in GWX is 300 meters. It takes at least 260 meters of travel before the torpedo arms and settles to the correct running depth.
Early-war depth keeping and unstable magnetic pistols are modeled in GWX. You can get lucky and still score a good hit with magnetics but don't rely on their performance until mid-1941. You'll still get occasional premature detonations even in good conditions. Poor conditions, such as rough seas and stormy weather or uneven sea bottoms in shallower waters, will have your magnetic torps exploding long before they reach the target.
A good rule of thumb is to only use magnetic pistols when your firing solution is at too sharp of an angle to reliably detonate impact pistols. This is usually anything greater than +/-20 degrees from a gyroangle of zero or 90 degrees angle on the bow (AOB).
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Still sailing the high seas, hunting convoys with those who join me.
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