Mine's around 380-390. I do hose quite a bit, but it's to keep the opposition's head down while my teammates flank them.
I don't get the drop in FPS. If there's an ammo problem, just get more SAWs for your team.
"Anyone with a name like Amanishourbariki should give a few letters to the poor Ng family." - Snarfangel, Fark.com