One bottle or 6,15mg of N is enough for a 50kg-70kg specimen, however the time taken till death is achieved is far greater. That's why 2 bottles are recommended, for a death that is not only painless but swift and guaranteed. Guarantees are reassuring. In light of this, at 260lb I would have to recommend that a third bottle be acquired and ingested. Besides, 2 bottles cost around $600 and for a third, A would only charge between $100-$150 for the bottle.