It depends on a lot of factors.
"IF" it comes to that, and there are women on the grand jury, I'd bet a week of lunches for a no-bill (assuming that's the process in Washington State). If it goes to a jury, same bet.
To the contrary, Austin Texas previously had an uber leftwing prosecuting attorney (Ronnie Earle, who also went after high profile politicians for bogus charges) who was looking to re-legislate gun control locally. He chose on numerous occasions to file against lethal force self defense cases, sometimes multiple charges (murder, unlawful discharge, ...) as an attempt to bankrupt the defendant with a gun.
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.50 BMG: 1 Shot 1 THRILL!