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They aren't really sure what is causing the bullets to jump. They figure the bullets are loosing most of not a sizable portion of their energy, the problem is bullet containment. Lots of ranges have environmentalists on their butts. So they are concerned that if bullets are not impacting the berm in a way that the berm can stop and hold the bullet, they need to figure out something else.
You are correct about the type of shooting adding to the problem. I imagine during a mag dump 1/2 of the rounds hit the ground before the berm causing them to ricochet upwards in an arc with or without a good amount of energy.
Simple geometry it seems, an excessively tall berm is needed when idiots are allowed to use the facilities. The local range I attend mandates 1 round loaded, 1 shot, 1 round loaded, 1 shot. It's unbearable for people who want to mag dump. They have an action bay where fast shooting can be done with rifles and pistols. Once participation in a action shooting sport is well established, access to the action bay can be granted. The process seems to do a great job of weeding out the people who could ruin it for everyone else.