Sorry Ned, I had powder on the brain. I read your question twice trying to make sense of Bullseye & Red Dot powder to your question. I'm thinking what the ?@%# is he talking about. Then after the 2nd cup of coffee I realized it was about shooting not reloading. Brain is a little slow this morning.
Now to your real question. You can learn to shoot with either. Years ago when I shot bullseye postal matches, open sights worked better for me. I tried the red dot sight, but it showed how much I jiggled. I should try the red dot again, now that I to have added a few years to these old eyes.