Butterbolt:

First two illustrations show original Krag chamber and 1899 chamber modifications. These were reprinted in Franklin Mallory's, "The Krag Rifle Story", 2nd edition, Appendix 9.

Cartridge diagram is from "Rules for the Management of the U. S. Magazine Rifle Model of 1898 and Magazine Carbine Model of 1899", 1917 printing.

---