[TXAZ]

Hey Green Lantern (a great superhero and show by the way),

With Boomer, and three - 10 round magazines:

1 mag with (legal) explosive rounds
1 mag with incendiary rounds
1 magazine with APIT

I'm pretty sure I wouldn't need 2 other weapons or last 2 mags. However, to complete your request for 3, I'd include:
A Winchester Model 94 to "Chuck Connors" any remaining movement
A Sig 226 as a close-in.

But at 100 yards, even with olympic sprinting speeds headed my way, and taking a conservative 3 seconds per shot, that's 6 seconds from first to third shot from a bipod & monopod, no sweat.