I have not tried the 130gr Berger, but would be surprised if you can get more than about 2,250 fps (more realistically 2,200) max from that 12.5". Not that it makes too much difference really.
Closest thing I've used to that 130 Berger are the 129 ABLR (excellent match for this setup) and 130 RDF at ~2,200 fps each. Still haven't shot many of the 130 RDF but the 129 ABLR works really well for short barrel Grendel velocity, almost like that bullet was made just for this.
Mine is easy to shoot with a suppressor too, but pretty loud without. It has a single baffle brake so recoil is almost nothing but being LOUD is the compromise. It works great on a bipod prone though; kinda fun to hit 600 yard steel in what most would consider "rapid fire" because the gun doesn't really move much.
