A vacuum won't even set them off. Intentionally tried that once. They just make a click and get sucked up like any other debris.
They do add quite an ambiance if placed under the log rack of a fireplace. Once the coals drop down they start poppin off pretty good.
Hmmmm........I sure hope you did not vacuum up any ......say...flour, sawdust, sugar, gunpowder or other flammable dust along with those primers.
The dust containment vessel on our vacuum is about one gallon capacity. It would make for one hell of a bang if a dust explosion were to happen.
