I think 1863.567 kg would weigh the same as a car.... what would you fire!?The last time I ran this event I just added a hook to a scrap piece of 6in diameter (round) steel bar stock. The total mass was something like 1863.567 kg (I actually measured to 4 decimal places and rounded to 3).
Edit: Just a small typo! I typed kg instead of g. It should be 1863.567 g.