A way to tame a allosaurus is by using 5-6 dinosaur gates and two big bear traps as well as two door for the gates

How to set up the trap

1 put stone or metal dinosaur gates in a row 2 put one of the doors on ether the first or last gate then put the big bear traps in the cage in front of the door 3 find a allosaurus and lead it into the trap getting it caught by the first bear trap then put your second down opposite the the one you placed earlier then you can start to shoot it until it goes unconscious

Ps it is recommended that you have a flyer to fly over the trap to get it in by leading it