I have not heard anything about that. I was going to try the Brenneke myself. I can get them at Gander Mountain. They are one of the cheaper slugs out there. I will try them when I sight mine in and along with some others as well. I know you can get the Brenneke at Gander Mountain, Bass Pro Shops, Cabelas. Im not sure if you have a Dicks Sporting Goods where your at but they have them to. You can visit the website www.brennekeusa.com to. They have a list of there dealers on there.