If it isnt too many thou. reduction a die and HD press (that includes arbor), with a premium lube can do it, but you reach a point where the bench wants to give out on you (it lifts up or comes away from the wall, etc.) The case is solid brass below the case wall proper, except for the primer hole, and it doesnt want to compress. Just look at a cross section illustration of a case, you'll see it, and see why it doesnt compress well.