I have the same problem on both of my 1898 US Springfield Krags -- rounds jam as the bolt picks up the rim of the case. Happens with factory ammo as well as reloads with spitzer bullets and round nose bullets. Reloaded spitzers are shorter than max COL, round nose are right at max COL. Sometimes a really hard whack on the bolt handle chambers the round -- I only try that with dummy rounds-- and it appears that the edge of the feed ramp or chamber is shaving a tiny piece off the bullet tip on one side. The case seems to be out of position as I start the bolt forward and may be rising after it is too far forward. If before I move the bolt forward I slightly click the cutoff lever toward "off" (to cut off the magazine feed) it bumps the round up toward the bolt about 1/8" and then everything works until the last round. The last round won't come up to the bolt. Could the problem be in the magazine spring? I'd appreciate any ideas on what to check or adjust.