I was running at 5292x1050, I just cropped it to 1680x1050 so the thumbnail would be bigger. The black area to either side was just wasted space anyway.
By the way, this is the original version of Return to Castle Wolfenstein, not the Game of the Year Edition. It's possible they modified the scopes slightly between versions.
Here are the files you requested. I only included one saved game file, where I have the gun and scope already equipped.
http://www.mediafire.com/?3ncv0u26sf58d89
As for the sizes of the pk3 files larger than 1mb
mp_pak0.pk3 == 61,730 KB
mp_pak1.pk3 == 4,346 KB
pak0.pk3 == 308,422 KB
sp_pak1.pk3 == 287,000 KB
sp_pak2.pk3 == 10,768 KB
Can you just shift that boundary over by a couple of pixels to fix the problem, even if you aren't seeing it? There's quite a bit of boundary space, so the overlap wouldn't be visible at all.
Edit: I'm also not seeing any missing geometry on this gun or scope. Did you crank the FOV really high to show the problem, or is specific to that particular weapon you're using?