[Tomsdad]

Ulzgoroth make's the key point about range vs. accuracy.

There's also the point that sharp shooters were likely better shots themselves so may have a skill advantage. Ordinary troops without direct experience of firing rifles may just have assumed it was all about the special gucci gun given to the special troops. i.e in terms of what different troops historically thought of each other they weren't all using GURPS LT as shared reference.

And that extra point of acc allows an extra +1 when taking enough aim actions so for an extra second you can bump the advantage up to +2 (which is not unlikely for sharp shooters)