if a convex shape is rifled while it is moving the resulting cut volume could become concave(example 1). does this new concave cut volume free up enough space to meet the rupurt cut challenge where a non-rotating sweep would not?

There are also other rotation profiles, hard to say if they would help or not.

example 1. a cube rifling faces parallel would not generate a concave cut volume but moving diagonally point to far point it would. really whenever a point sticks out. Unfortunately a cube already fits and any help a convex cut volume provides is not needed.