I would make a bet that more mass shootings are done with 9mm. Depending on which shootings they consider ‘mass’ I see estimates from 60-80% for handgun usage. I’m sure the cheap .22 is a large number, but 9mm is probably right up there. There is a large bias in reporting the school shootings and shootings involving rifles by the media. They almost ignore the others.
Easily. You’d just have to use it to push your orbit in the right direction at the right time. If you are like Pluto, and way out there with a very eccentric orbit, unfurling the sail as you are heading into the galaxy might make your orbit path curve through the sun itself.