I don't know the proper terminology, but that would make sense. It's not the spring or the housing that contains it. It is the shape (I'm guessing) of the surface that pushes the round upwards that seems to cause the problem.So you need a Follower? Not bottom metal..?
Thank you for the help.Are you shooting this as a single shot and not wanting the mag to get in the way when you close the bolt? If so, you need a single shot follower.
If that isn't it then you need to expect to either have shells in the mag or reach in and push the mag down a little as you push the bolt forward. This is the nature of the beast.