I have 2 daughters age 10 and 11. They did their list for Christmas and at the top of both of their list were new guns. I'm so proud of them. I bought the guns that they wanted and I figured I would go shoot them to sight them in before they got wrapped up for Christmas. When I started shooting at the range, both guns began to double feed. I would fire 1 to 2 shots then as the bolt went forward for the next shot, it would strip 2 rounds and then I would have to clear them. The strange part is that both would do the same thing. The guns are a Marlin 795 and a S&W MP.22. Yea my girls have good taste. The ammo I was using was the Federal bulk pack. I've never had any issues with this ammo on my other .22. Before going to the range, I cleaned both guns and used the magazine that came with them. I haven't had the chance to buy any new mags yet. Now I only had time to fire 3 mags through each one. I have to say the the final magazine did not have as many jams as the first mag did. Do you guys have any ideas as to what might be happening?