Keep in mind that OAL, bullet setback & pressures are inverse from rifle to pistol. It's likely they would fire w/ little issue. The bullet being that far away form the rifling reduces pressures more than compressing powder raising pressures. No good reason to shoot them though, unless you just want to make noise.
I put them in my junk brass bin. The recycler gets 'em. but i don't have many that have live primers either. Otherwise yeah, I give them back to mother nature.Just toss em?
Not likely, just a lower pressure event. Full disclosure, I have done it w/ an ar & the 223. Nothing terrible happened, it even ade it over the chrono, just at a lesser vel than normal. Just take them apart if you reload or you can drop them into the range bucket. Someone will deal with tem.Wouldn't that make it a candidate for a squib? Either way the rounds aren't going back in a gun. Or would you put the empty case back in to set off the primer?