[Hades]

Depending on where you're located there is a sniper course that you can take that if you can prove to the instructors that you can safely operate a higher-fps rifle then you are more likely to be allowed to run said rifle at games. However it is still up to the game host whether or not they let you run your rifle.
In my case for example I bought a very hot shooting bolt action probably abour 3-4 years ago. Only last year did I take the sniper course because I wanted more experience just playing with my aeg. This will be the first year I actually game my bolt action and I have done so already several times. While I have gotten some nice hits at long distance, there is still alot I have to learn yet.