500 yards is quite a shot. I've never seen a XP-100 R before. I'd imagine a short-barreled rifle without a stock would really test your shooting skills. How difficult is it to get a stable sight picture? The lower velocity would really put some extra considerations on the shot.
Congratulations on the hunt. It looks like you're making the most of your trip. 
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"If we lose freedom here, there's no place to escape to. This is the last stand on earth."
RWR
"If it neither breaks my leg nor picks my pocket, what difference does it make to me?"
TJ
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