Miles,
I have several recovered X's, from the ungrooved originals to TTSX's, that have lost petals--including one, shot into the shoulder joint of an axis buck, that lost all 4.
Might post a photo later, but for now I will repeat something that Randy Brooks told me a while back, while we were on a deer hunt together almost 20 years ago, after the TSXs appeared, but the TTSX's had not. He was astonished after introducing the original X when so many hunters thought it was so desirable for X's to retain all their petals. He always though losing petals might help them kill a little quicker, but being a good businessman, he gave customers what they wanted, tweaking the design until X's did tend to retain all (or at least most) of their petals.
Nowadays, the LRX's are designed to open up easily at lower velocities, so do lose more petals.
