I spined a big 4x4 about 5 years ago at 8 yards, facing directly awaywith a Triska SK 125 gr. head (76# draw - aluminum 29" arrow - KE through the moon).
This was a shot I'd made many times before with fixed heads. This was my first (and last) experience with high-diameter mechanicals.
Well, the arrow was perfectly placed, and penetrated just enough to bury the head of the ferrule in the bone, and crush the entire unit, shearing off two blades entirely, and demolishing the entire head. The deer ran about 10 yards before the arrow fell out, and I got the joy of watching him stroll across a 100 acre field and into another wood plot.
The head looked like you fired it into a concrete wall. Complete failure.
