Catching up on THE SARAH CONNOR CHRONICLES, I note that in the episode "Goodbye to That," Derek Reese gets smart and engages a Terminator with a .50 BMG Barrett rifle -- I didn't get the best look, but since he fires it semi-auto (*off-hand!*) at a Terminator, I guess it's the M82A1. The scene was pretty close to my dream come true, as Derek targets joints and vulnerable areas with a very powerful round, and uses claymores to slow the baddie as needed. Pretty well-done scene, especially when you consider that the production has to keep Terminators really formidable to make opposing them dramatically interesting. My only real gripe is that Reese was shooting the .50 (again: *offhand!!!*) pop-pop-pop, like he was firing a .223. I will accept that Reese is nineteen kinds of manly, but there are limits. That round has some kick to it. There's a *reason* the M82A1 comes with an integral bipod.
Nice to see some interesting gun selection in the second season, though. If the SCC crew are so inclined -- and if logistics will permit; I don't know how the prop departments handle this stuff -- they could have a lot of fun with different kinds of weaponry.
Another way to handle a Terminator: as we've seen in previous episodes, you can cause serious annoyances for a Terminator if you damage its tissue to such a degree that it can't readily pass as human. That might be a legitimate strategy to employ, particularly against the socially-skilled models. (Shirley Manson would, of course, be another story.)