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[Eagle of Fire]

Throwing accuracy only matter to calculate if the grenade will land on the spot you asked for or not, and if not by how far. I beleive strenght is the stat you should look at if you want to be able to throw further.

Also, sometimes you can't throw further because there is something blocking your throw arc. For example you'll notice that you can't throw far in a house because the above floor will block your throw arc...

Kneeling when throwing can allow you to throw further or in a way you could not before. Such an example would be to throw a grenade in a window while kneeling. I never tryied such a tactic myself tough.