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Looking at the plans in Janes, it seems that there is little obvious choice to be made in terms of horizontal or vertical impacts, or much in between. However, horizontal protection was generally thinner than vertical protection which would mean that if you hit with plunging fire you would be more likely to penetrate.
John, in a vacuum, most WWI ships would plunge at 20 degrees to the horizontal at maximum range. However, a long time ago I saw some numbers on the German 11 inch (no I can’t remember which one) and at its maximum range it was plunging at over 45 degrees. You are right, if you take out Jutland and the close calls at Dogger Bank, there are few cases of magazine explosions on record and those which are tend to have been big non penetrating explosions causing sympathetic donation.