Non-crimping style provides accuracy, consistency and perfect alignment.  Years ago, Forster/Bonanza obtained U.S. Patent #3,440,923 for the  design of the original Bench Rest® Seater Die. That patent covered  the use of a specially machined, close fitting chamber that holds  the case, the bullet and the seating stem all in perfect alignment.  This innovative chamber design is still the hallmark of our Bench  Rest® Seater Dies, because it's the premier system of all the  so-called "in-line" seater systems that supports the entire outside  diameter of the sized case rather than just the bullet and case neck.  We have continued to refine our seating stems to better fit newly  designed ballistic tips and to match most VLD (Very Low Drag) bullets.  Our close fitting chamber (part #P-30) made with one-piece reamers  ensures concentricity and accuracy.