Okay, I tweaked my numbers to more consistently hit my combat caps (habit from Mutants & Masterminds 2e and Champions).
I know the Blaster specialty is an obvious pick, but I decided to grab Support to encourage me to do more stunt-y stuff. I think my baseline numbers are fine for "shooting guys". Might put together some examples of the kinds of dumb FPS guns that Shrapnel can make with their Omnipower, but I think I'm fully ready now.