In honor of Simo H?yh?, who used a similar Mosin-Nagant (with over 505 sniper kills during the Winter War) I suggest naming it Belaya Smert or "White Death."
I think that would be appropriate if it was a Finnish capture/made Mosin, but it's probably not, seeing as most Mosin's on the market are Russian.
I've just never heard it said like that: my "Hollywood" comment is based on me getting rather suspicious thanks to horrid phrases like "lock and load" and calling a magazine a "clip". The jacket's actually a slightly tougher metal than the core so that the rifling doesn't strip it off due to the high velocities attained by modern propellants; though the opposite is true for armour-piercing bullets where the hard steel core would destroy the rifling.
Those terms are often actually used in the military. For example, when a soldier says he/she's "locked and loaded", it means their gun has a round in the chamber ready to be fired, yet the safety is on so they can't, hence "locked and loaded".
What someone loads a pistol or M16/assault rifles nowadays with, is called a magazine, they're never called clips. Clips are used in rifles like from WW2 and so forth that are mostly bolt action, though one exception is the British Lee-Enfield. It did have a detachable box magazine, but it was always loaded with two clips, instead of taking out the magazine. Saving time and weight, not having to carry multiple magazines.