You got brass, and now powder. What you can do is start to work with your powder measure (PM). You may think that you "set it and forget it", but there's a lot to using a PM and you need to start perfecting your operating technique.
Fill the PM hopper about 1/3 - 1/2 full. Set the adjustment so you're getting about 4.0gr. Then continue to drop powder and you'll weigh each of the drops. You can enter those in Excel and then plot the output over 25 or so drops. I want you to understand when the
greatest variations occur. And understand how your technique affects
consistency.
You can't leave powder in the hopper over night, so you may need a funnel to get it back in the can. I also want you to check and see if static is making powder cling to the insides of your PM. One of the things Lee PM owners do is wipe the PM down with those static-free dryer sheets.
If your PM is sticky or rough in operation, you can dribble some powdered graphite into the hopper. The black coating on the HP38 is powdered graphite, so it's compatible. Look in the key & lock section of your hardware store for graphite.
I can see several hours of
practice just with the PM before you'll be ready to load anything.
Go for it !!