I don't know much about the stagger feed. However I built a 22-250 on a long action and had to use an Axis 22-250 mag in the blind box with the bottom plastic removed. I had to shim it up and forward. I also used a long baffle for the bolt to shorten the stroke. I would think it would work if you removed the box from your action but am not sure. Hang around help is on the way cause GaCop will know,