Really!! I have never had a Thunderhead come apart in a critter but the largest I have shot is whitetail. That and messing around with some buddies one afternoon that shot various broadheads and the Thunderheads were the only ones to stay together after passing through a burn barrel.
My personal best turkey is a 27.3lbs in the days when birds still had to be registered and weighed on an inspected scale and yes they are rare but I have many 25-26lbers(one with 1 7/8 spurs) over the years.
The turkey shot in half was a wild/tame cross(white and brown) that came off one of the local Cuddy farms that was hit with a 100 grn Rage out of a crossbow from 10 yds broadside. Flopping may have contributed to some damage but spine was severed and breast was cut through. When he took it out of his truck I thought it was a road kill. The buddy who shot it is the pest control guy for Cuddy's and they DNA tested the bird in their lab and it had 75% wild genes, although feathered more white than brown.
By the way the law previously was NON serrated blades on broadheads for deer and as the deer hunting bow specs applied to turkey you draw your own conclusions. From the 2008 regs:
Bows must, at a draw length of
700 mm (27.6 in.) or less, have a draw
weight of at least 22 kilograms
(48.5 lb.). Arrows must be at least
600 mm (23.6 in.) long and have at
a minimum a 22 mm (0.87 in.) wide
arrow head with at least two cutting
edges that are sharp, unserrated,
barbless, straight and made of steel.
Anything else you would like to try and call me on??
They didn't change it... it has always been that way... Thunderheads are very destructible, I have seen the snap in half, shear blades and lose tips... and no broadhead cut a 28 pound Tom "just about in half"... BTW, a 28 pound Tom is an exceedingly rare bird.