Sorry, don't know that specific bullet but if it's 158 gr the max load with Power Pistol is 6 grains, but that is for a Speer swaged LSWC. I doubt that there is any extra headroom for pressure. 5.6 gr seems good to me, but I'd like to cross check some data.

I see the bullet you are talking about is 170 grains. Do you have a chronograph??? I think I would back it up a little more and work up until I got satisfactory velocity.

PS: I like Power Pistol a lot but reloading data is a little sketchy.

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