Bought 4 shockwave exploding targets from local gun shop, couldn't wait to go shoot them. Today me and the wife went to shoot them let her shoot the first one. WOW what a boom, cleared out about a 8 ft circle in the corn stocks and busted a 6x6 post in 3 pieces. Got the other 3 out one at a time nothing, no boom nothing but broken containers. Mixed all of the same, shoot with same guns and loads. Mistery to me on why they didn't explode. Anyone ever had this happen?