To add more confusion and headaches.

Anyone else experience this besides me?

I was shooting a 3d target last year with some alluminums out of my Hoyt Ultratec. I chrono'd them at 273fps. I started shooting the Mckenzie target (brand new) from 20 yds. I then backed up to 30 yds. The penetration at 30 yds was a good couple inches deeper than 20 yds. Now I'm no rocket scientist here , but by my experience I have to assume that with a heavier arrow momentum will actually increase down range in certain instances.