word of CAUTION. . .these dies are NOT for standard .257 Roberts.
if you are loading just a few, then I would purchase a Lee Loader for the .257 Rob. one load at a time but is an excellent way to load and for just a few the $20 or less is a very good investment. you will probably have to go to eBay to find one, but worth the effort. I believe that Lee has stopped production of the Lee Loader in .257 Rob.
you might be surprised but many bench match shooter use the Lee Loader for their rounds. one reason, same round each time out of the loader is just like the one before and the one that will follow. not so with some of the other automated types.
the .257 Rob is an excellent round, from groundhog to deer, but has been swallowed up by the BIG boys and their magnums. I still load and shoot my Rob on a regular basis. many good rounds have been killed by magnum mania.
Cuz