If its of any interest here, I have recently made a 12ga roll crimper that is a hybrid of the original Lyman 12ga roll crimper with an appropriate recess to accommodate the nose of the Paradox (Fosbery) projectile and possibly similarly shaped slugs in 12ga, it incorporates the 'crimp teeth' from the original Lyman design with the recess for the nose of the Paradox slug, works beautifully on both plastic and paper cases, will post pics here soon enough!