Because it wasn't supposed to be at 300-310. Bugs happen, people being Illogical and not loosing their shit over a number also happens, to often.
English
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If it wasn't suppose to drop at 310 but 290 why would they have it at the time that you could buy it at 300, it's obvious they just didn't think of the damage it could do so wanted to nerf it so people can't easily kill there stupid bullet sponge bosses
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Hahahaha