Yes, it's me again, and yes, you have been fed more doubtful information and need more books! In this case, "Mauser Bolt Rifles" by Ludwig Olson.
M1895 ChileanMausers were made by Ludwig Loewe/DWM. I will not repeat the entire company history, but basically the Ludwig Loewe company purchased the Mauser stocks in 1887, and Paul Mauser remained as technical director. Having also got more than 50% of FN (founded in 1889 to produce Mauser rifles) and acquiring the German Metallic Cartridge Company, the company was reorganized in a new firm - DWM - in 1896. As a result of the name change, M1895 rifles may appear with Loewe or DWM markings on the left side of the receiver.
I should certainly hope not! The M1895 is a so-called "small ring" design, and not a K98k! See Kuhnhausen "The Mauser Bolt Actions".
7.62 NATO has operating pressure way above the levels of the 7mm Mauser cartridge.
Ballistically, there is no such thing as a truly flat trajectory. Gravity affects bullets of all sizes. You may be thinking of the reputation the Spanish Mausers acquired when used against the US in the Philipines. Much flatter than the competition at that time, yes. Flatter than a 30-06, no.
Patrick
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Not unless it is filthy or corroded. If you really want to take it to bits, get "Military RIfle Disassembly and Reassembly" by Mowbray and Puleo.
Patrick