Visited my local indoor range this past week that I’ve been going to for past 4 to 5 years and was surprised when told that cardboard targets were not allowed. I said that I was never informed of that rule in the past and inquired to why the ban. They told me that the cardboard particulate clogs up the air conditioning filtration system. Really? Anyone heard of this? I thought maybe they just want the customer to buy their overprice targets. Do paper and splatter targets as well as gun powder & lead not harm air conditioning filter systems?