Victory with a gun from the battleship Nelson

What if Nelson had a gun from HMS Nelson mounted along Victory's centreline and could fire it without destroying the ship?

Under that assumption, its range could allow him to destroy Spanish ships before they could engage.

The question gives Victory a fully equipped gun from HMS Nelson and explicitly assumes it can fire without destroying the sailing ship. Recoil is joked about as sending Victory backward. The serious comparison concerns range: the later gun could engage the Spanish fleet from far beyond its opponents' reach. A highly destructive result is expected within the scenario's artificial assumptions.