I'm new to reloading and so far have got some pieces from Lee, RCBS, Lyman and Dillon. I got a set of Dillon .45 acp dies to use on my Rock Chucker Supreme. I was tempted to go with the Lee .45 dies as they get great reviews and are much cheaper but I plan to buy a 550b reloader next year and want the Dillon dies on it. To my surprise the Dillon dies have the lock nuts but no locking set screw. Is this because they're meant to be permanently installed in a progressive press? Sure would be nice to have the locking set screw.