I bought a bulk pack of Winchester Universal 12g shells (100 shell count box). I bought them just to shoot clays from our backyard trap thrower. Every shell I fired the aluminum case swelled inside the chamber of my Berretta 391. So I tried them in my Remington m870 express which has fed, fired, and ejected every shot shell and slug for the pass 15 years in all kinds of conditions. Then tried them in my h&r single shot. The h&r and the 870 had the same problem as the Berretta. So I drove to back to dicks and got some good old Winchester AA and didnt have anymore problems. Here are the target loads you should never use. http://www.walmart.com/ip/Winchester-Universal-12-Gauge-Shotgun-Shells-100pk/16817270
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