yea - sry - the reason to start with the T2 mag is that if she doesn't blow, then there's no alarm. In 39, before there are T2s, I stick with impact.
Also - you can get keelshots with impact, but it's unlikely because of the curvature of the hull. Still, withi mpact I always try to go as deep as possible without having it bounce.
Not sure if I answered your q; I don't know the numbers,
Kb.
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