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Explanation: This is a term that I found in the GDT, it might help you or someone find a better term. I don't know if this is the exact term, but it seems to go with your context. Look in the GDT under "kill line". I'm not sure about how bullhead fits in.
Explanation: Je ne suis pas sûre, mais votre bullhead (tête de taureau ?) et vos propositions me font penser au "Bélier" (mâle de la chèvre) , terme utilisé aussi pour désigner une masse qui permet de défoncer un obstacle... autre expression: coup de bélier.. si ça peut servir ??