Heres the result in my testing of Muzzy broadheads:

Bow: Mathews Outback 70lb, 27" draw

Arrow Gold Tip hunters 55/75

broadheads 75,100,125 grain Muzzy 3 blade

75 grains at 25 yards Dead bullseye ... Penatration average 17"

100 grain at 25yards 2 1/2 " low .... Penetration average 22"

125 grain at 25 yards 5 1/4" lowPenetration average full arrow, some passed thru

target was a layered foam broadhead target I got at menards.

I always shot 125's, good penetration (all pass thrus) good blood trail.
this year I went to 75's to try and flatten out my trajectory. What was my 20 yard pin with the 125's now became my 1" low at 30 yard pin. But the first deer I shot was a yearling doe, maybe 85lbs field dressed. The shot was a double lung at 22 yards, the arrow was laying on the ground, it passed thru, but did not have enough energy to hit the ground. With my 125's I actually have shot thru a doe (120lb field dressed) passed thru and stuck about an inch into the tree that was behind her a few yards. Impressive. I switched to the 100's in order to try to get a little of both worlds, speed and kinetic energy.