at 470fps, which is the top, or close to the max fps at most fields, a .36g BB is most effective.
At 420-440 fps, .3g BB's are most effective.
You'd have to be shooting over 700fps and would probably need a hop rubber made of copper or 2000 series aluminum to make those work properly lol
Oh and if anyone is curious, a depleted uranium BB would weigh almost 2 grams
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