I had my mossberg 590 and 500 out yesterday with the esstac card shot-shell holders. I was shooting some full power slugs and 00 buck all 2 3/4 inch. The shells in the cards were moving all over the place all loaded brass up. They slid down, they slid up, with full power slugs they even popped straight up and out of the saddle falling to the ground. They also slid down a few times so low that the brass rim was below the top of the elastic bands as if any further and they would have been on the ground. I experimented with different positioning heights with the shells all loaded brass up but they were still moving all over the place. Very disappointing. Has anyone had similar experience with the esstac cards?