By Long Range I'm going to assume you are talking more about competing in "F- Class" rather than "PRS".
1. Goggle LR shooting ranges in your area to see if you have any, or for F-Class competitions in your area.
2. Start looking at what the majority of the competitors are using from caliber, to actions, and Optics.-- You said you wanted to compete, so you gotta have at least as good of equipment as the leaders.
3. Build it or have it built, start doing load development, and practice, practice, practice.
After that, or during all of the above, try and attend a competition and observe how it all works. Talk to a competitor or two and ask questions.
I haven't ever competed but I know that's where I'd start. I'm sure someone else will jump in here who has competed in one or the other disciplines, and will have more extensive suggestions.
Good luck to you!!
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