I just calced and it would do 73.4% - 87%, however if you were naughty it would do 82.5% - 97.2%, enough to have a chance to KO after sr damage, move a few evs to sp attck and you can kill giscor. It seems odd but it could do a lot to garchomp or opposing landorus. I just don't like the idea of explosion this gen with the damge much lower, and the abundance of steel types and jellicent