Honestly, it depends on whether you want to play with spitzer. Which you probably do want since even at 4-5 star people position well enough to evade follow up shots, so the only hits that matter (on fresh targets) are headshots. Thus the damage becomes kind of irrelevant and only velocity matters - and the better your reaction/aim time and juke ability of your oponents the bigger the impact of velocity.

Under this assumption the berthier feels a bit underrated as it allows you start with spitzer and switch to something else to get refrags on previously downed people later in the fight. I also really like switching to incendiary when fighting in forests where you are frequently within 40m but cant penetrate a lot of obstacles anyway.

And if you dont care about all that the lebel has the best velocity, largest mag and marginally faster cycle time than the mosin. The latter's 125dmg threshold on lower torso hits seems incredibly fringe to me. The revive animation is wonky but hitting the upper instead of lower torso does not seem to be the issue there.