For slugging, take a lead egg fishing sinker larger than the groove diameter of the barrel and gently tap it into the bore- I use a plastic hammer. Use lots of lube on the lead, and lube the bore also with gun oil or 3-in-1 oil. You can run the slug all the way through to get the smallest bore/groove dimension, or you can tap it into the the chamber/ throat end, then tap it back out, and do the same with another slug on the muzzle end.
Lee sizing dies look very similar to reloading dies- they screw into you reloading press like a regular die. There is a pistol shaped device that attaches to the ram of the press that you simply set the bullet on and push it up through the die. The die is a more or less a hollow tube with a constriction in it to squeaze the bullet down.
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