Rim fire vs LW poly smooth

Got a friend that builds 1000 yard competition rifles. He and I are getting a bit excited at the possibilities. Hopefully with his expertise
and the help of a few barrel manufacturers we will get what we think is a good starting point With the barrel. Slugs are a little different story.
we will stick to 22 in 40 gr. ATP and Javelin are first Once we get it all settled in. May be a minute on that!