About the bullets. A lot of folks assume they were minature forcefields but I doubt that. In the first TNG episode they describe the holodeck as using transporters, matter, and forcefields to create the many items in a simulation. There's absolutely no reason to believe that those bullets in FC weren't acutally metallic projectiles replicated by the computer. The holodeck uses raw material to replicate items.
That's the only way that whole scene would make sense, considering Borg shielding allows you to walk through forcefields as if they weren't even there.