M1898 S/N 445281 (i think one of the last ones made)
Unmodified.  Has flip up pin hole rear sight.
Round nosed bullets.  I am testing both 180gr and 230gr, but both have the same COL

As mentioned above I too have a problem with 5th round feed.  I and going to completely disassemble the feed ramp and polish all of the surfaces.  I have a new spring as well.

The bigger issue is the occasional jam. The bullet is not jammed against the feed ramp, but the bolt will not move forward and it is not touching the rear of the cartridge.  If I open the door and shake down the round I can clear the jam.

Sorry, but I can't figure out how to post photos.  I don't have access to a web site to which I can upload and reference photos.

---