There are a couple of different lengths of 38-55 brass, my H&R will not chamber the 'long' version which is intended for the old, longer original chambers. I have also used fire formed 30-30 cases with success. They end up even shorter than the short 38-55s (current Win. production) but I can seat the bullet where I want.
Some dies you can buy separately from Midway, but I sure would check your notion against their price on a complete new LEE set.