I just talked to the head man from Berry's at the NRA Convention on Friday. He said keep them to 1250 fps or less, or you start to see spatter on the targets. The lead inside is quite soft, and when run too hot they start to liquify from the heat of friction. He also said that if you crimp them too hard, you can cut right through the plating and ruin the accuracy. The plating is very thin on the standard bullets.
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