I've got a Jennings Devastator crossbow
I don't know how many deer that thing has taken over the years, but it's been way more than a few.
The power that thing has is amazing! It will shoot thru a 3/4" piece of plywood with a broadhead (Thunderhead 125) just ask me how I know.
If you got it cheap and it still works properly, you have a very serviceable crossbow for deer hunting.
I'll look to see if I still have the info on the bolts it shoots.