Thanks for your replies.
I think it's a bit strong to assume any one with a semi auto is just not a good shot by default. I've seen some mall ninjas and military guys with pretty good aim. Also, how do know it has to do with speed? I like to shoot my semi auto 22 at a casual pace really. Maybe I'm just to lazy to cycle a bolt myself, and want a gun that does it for me.

Really though, I was just curious. The BAR is the only semi hunter that has really peaked my interest. I think based on feedback I've received, it's probably a great rifle. Reports on the 7400 are mixed anyway, and the Winchester 100 is long out of production, and not that common. I've tried a couple of the SKS and other surplus rifles, but they're heavy, not very scope ready, ammo is often hard to get and corrosive, and some are not accurate. If I go semi, BAR would seem to be the way.