We shoot sling/prone and F-Class side-by-side in our matches. Except for some good natured ribbing between the groups, we generally don't have any issues. We just filled our state match with 60 shooters and 14 will be Prone. There will be an award for winner in F-Open, FTR and Prone. And class winners in all 3 groups.
I started in service rifle, moved to prone and ended up in F-Class, so I have shot all 3. I take nothing away from any of the disciplines, as to achieve a HM ranking in any of them takes work and dedication. Yes, Prone shoot at a bigger target, but they also use open sights. It's not as easy as it looks!
We shoot our F-Class/ Prone matches on the 1st Saturday and the Service Rifle guys shoot theirs on the 3rd Saturday. So range usage is not a problem.
But, IMHO to have harmony within the groups the MD needs to make all feel welcome to the match.