A buddy is going to give me his this weekend, and scanty Internet info states that the 50's conversions resulted in either 'hard but brittle metal', or strong metal. It is impossible for me to determine whether any of the info is reliable. I've read claims and heard about the Spanish/Latin. American 7mm conversions to .308 (NATO 7.62), in that this stretched the pressure design to its limit. What is the truth about these rifles? My buddy (in another city) was told some seemingly far-fetched story that they had been built in the 1880s as muzzle-loaders, then converted to 30-06 in the 30s or early 40s because Germany would not ship the correct ammo to a US ally. The story he either read or was told seems a bit bizarre. Too many Internet reports list no sources. Were the chambers completely replaced by components from an actual 30-06, and were they designed/produced in Brazil, another Latin American country, or all done in the US, and shipped right back to Brazil?