First, welcome. When I get a new gun I read what the Manufacturer says will shoot in that gun and then I try to duplicate it, since the gun usually shoots well with what the recommend. That gives you confidence that the gun is a shooter and that it is put together right from the factory. I then start experimenting with different bullets of the same wt (I like 300g over 250g since 300g tend to shoot thru a deer leaving an excellent blood trail) and shot them at the recommended load. My brother has an Encore (not the pro hunter but a regularencore) and it likes Harvester SabreTooth 250g with 3 777 pellets. Best wishes for dialing in your rifle and hunting this fall with it.
Chap Gleason