Yep, shooting the balls up like a rocket. The first ball would shoot fine and basically at velocity in a shake and bake. The second one, maybe. The third, every single time, was a choke or brake in the hopper. There were multiple ball brakes inside the hopper. Not the neck. The hopper itself. I'm pretty sure there was overtravel with the bolt causing some air behind the bolt to go up the feedneck and also causing misfeeds, which I think I eliminated with the harder secondary bumper spring. That right there is a cut sheridan mainspring. It stops the bolt right quick. But there is still a decent amount of air that flows around the bolt head. I have no clue how DW could have gotten around it.