Go for the Redding, you'll like the graduated scale on the needle end.
Buy just once and not have a worry for years.
Now keep in mind every scale reads a little different because of conditions. You could measure a certain amount, then take it over to your buddies scale and it will be different.
It doesn't matter, the powder measured only pertains to you and your application. What does matters is the scale be able to repeat that measurement time and time again.
Oh, and you didn't make a mistake, you just learned. Learning is good, I've had several lessons like that from Lee (hint,hint)