anyone shooting the Hades 16 gr well in their Impact MK2?

No, but I do shoot them thru a 380mm pellet liner A at 960fps, and they are lasers 

890FPS is low power? Try shooting a 2x4 at 10 or even 50 yards and see how much it can penetrate and then decide on what you mean by low power. 



For reference I've shot hades in .177, .22 and .25 at 500 fps and they are still very accurate(1 hole at 34 yards but i'm sure they will be just as accurate further), 400-600ftps is what I would call low power. 

@qball. lol, low power for my Impact at least as I tuned that gun to sling the 23gr slugs at 950fps. Yes I agree, low power should be below 500fps.

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Maybe you should change your video title to lowER power setup! LOL

With major weather change you have to rezero and run ballistic calculation to see where the POI have changed. I'm guessing with the cold even your gun might be shooting a little slower but even with same speed the much denser cold air with snow will lower the POI significantly, in those crow shots I bet the slug were just below the crows.