One rein stops are your absolute best option. BUT, They MUST be controlled, if you yank suddenly/or to too harshly you can throw your horse off balance (if they're really taking off like a rocket) and end up doing a header in the dirt!! Think big circle, not little circle....
Also, I know this varies by horse, but our QH's have never bolted for more than well...about a 1/4 mile.
They get tired and start to wonder why they were running in the first place. If you can't get them turned, hang on and think slow
they can't/won't run forever.
Scary and I don't like it one little bit.