Re: .308 velocities to expect from an 18 inch barrel?
I run factory ammo, like Cor Bon and SW Ammo and I get between 2575fps and 2605fps out of my Gladius.
My 22" Valkyrie gets 2725+ fps out of factory ammo, and my new AX with a Bartlein gets 2650fps out of a 20" barrel with most factory 175gr ammo.
So you are slow, not to mention my stuff is no less than a .299 bore, the Gladius is a .298 bore as well as the Valkyrie.