Hostile paint bores out pretty big. I've had good luck using Hostile Victory through my pumps. Had it boring out to around .684-.688 (was tight in the .684 UL back I have, had about 4 to 5 points of contact in the .688 so I'd say it was probably around .686).
RPS stuff seems to be really tiny so I would avoid that.
This line is in remembrance of Jared Wilson, friend and paintball teammate who died on 7/27/2005.
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