If the performance enhancements are made possible by the new materials, fine, but if performance would be better with lead, it was the wrong choice.
I think the impact of and amount of lead projectiles on the environment are negligible. Remember that the whole copper-only bullet thing started in California, because they wanted to make sure no Condors died from eating lead. Note that there was no evidence that any creature died from eating a bullet or that they ever would.
The damage to the environment during war is from something other than small arms. It's a non-issue that alarmists have managed to blow out of proportion.
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