You can try to flank the Hanzo and open up by detonating Dynamite onto him to make him one-shottable with a headshot or to make bodyshot damage very threatening to him.
Even if he tries to close the distance with concussion mines, he's incredibly easy to headshot out of the sky or Coach Gun if he actually gets close.
Just don't let him sneak up on you, because he can one shot combo you with a grenade and concussion mine.
However, at longer distances Ashe has the advantage because McCree's Peacekeeper will start to fall off while your scoped shots will not.
bumps into an enemy or enemies , B.
Its burst mobility is very versatile, as it can allow Ashe to cross gaps she wouldn't normally be able to jump by blasting horizontally or reach high ground in a similar fashion by blasting towards the ground.