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What he's saying is our field limits are based on joules of energy, not fps.
And again, although heavier ammo is more accurate, it's going slower and therefore requires an incredible amount of backspin to keep it in the air. But there's only so much backspin you can put on a bb, so using anything above .28g if your shooting under 400fps on .2s becomes less effective.
Bolt action rifles are allowed 470fps, so using .3s is more common.
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