Listen pal if your blasting trees behind your so-called berm or whatever then 2 things are the cause a) the berm doesn't exist b) it is not of sufficient size height or depth or both . Anyone that shoots firearms knows what destructive power they hold and if they don't maybe they need not own a firearm. You come on here and post pictures of trees that were hit behind your shooting area and we are supposed to believe that you have something built to prevent this. BTW a local shooting range closed down because neighbors were complaining about bullets whining over their homes. There was no ass-umption here the berms were not high enough and the guy who owned it never repaired them as a matter of fact the only thing separating the range from a busy bifurcated highway was a small patch of trees, surprised someones car was never picked off.. In your case I would put in a berm or fix whatever "Berm" you have because its not working.