Suggested by Destroyer Bullseye’s power is all about being lethal so I can definitely see how you can make a case for him taking the win here. That said, I don’t think his usual equipment would be able to pierce Anguirus. You can have the best aim in the world but if your weapons are found to be lacking then that’s it. There just isn’t a whole lot you can do. Bullseye isn’t much without his tricks and that’s going to be clear in the match. Anguirus wins.
Again, considering what Anguirus’s most famous foe is, and how the Marvel Universe reacted to him, Bullseye has no chance.
Agreed, Bullseye is really outgunned here. He doesn’t have very many options for trying to deal damage or staying in the fight