Flat, if hunting for yote or something...204 out to 300-400 hard to beat. Before you build any Grendel or arc, look at the situation on reload stuff and ammo. Coming out with a new cartridge in a buying rush has killed about all the supplies. There's guys buying 6.5grendel ammo pulling bullet, necking down for 6mm. If that sounds like a fun time, by all means...this isn't going to get any better anytime soon. Just a heads up...