See, I'm not a ballistics expert. Nor - though it shames me to admit it - am I an Engineer® like everyone else.
Thus, I can't tell which would be best for 'Squatch. The SF Short is designed to penetrate hard targets. Well, if it can shoot through a brick wall, it'll penetrate a 'Squatch. However, the Black Magic is optimized for massive wallop on big, dangerous animals, delivering more, er, foot pounds per thrust. So to speak.
Most people who have encountered a buck 'Squatch have placed the critter at 7-9 feet tall and weighing 600-1000 lbs. That's a lot of pissed off 'Squatch to deal with.
Of course, if the witness was a woman you can't put much stock in her description of height and weight, because most of them have been told all their lives that this:
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is ten inches.