LeviY, welcome to the board!

I have used Thunderhead 125`s almost exclusively for probably 10 years now. They fly great, and are sturdy heads. They are EXTREMELY sharp right out of the package.

They are not, in my opinion, as sturdy as some other heads, but I have yet to have a bad experience with them.

I would not think twice about using them on Elk. In fact, I have used them on elk.

Good Luck