If you already have the Lee mold, use hot glue instead. Lube the mold with Pam or some other lube and squirt the hot glue into it. It helps to cool off the mold in the refrgerator or an ice water bath. Put some more lube on the bullet and seat the bullet all the way down into the case so it is right up against the flash hole.
Shoot outdoors because, while the shots are not very loud at all, the smoke is 100% primer which contains Lead. Your shots should be able to puncture a shopping bag or cardboard box and get trapped in a towel. You can reuse them over and over again.
Be sure to clean the mold after you're done so you don't drop wrinkled lead boolits!
38/357 gluestick bullets made from the Lee 358-158-RF mold (some have been shot multiple times: