Going to say that getting a sniper headshot is harder than spraying some guy who's close to me. If you're moving, it's such a small target and painful to manage a close range kill (for myself at least.) A shotgun on the other hand, cannot be supported by "they used primaries," because well, snipers have to use primaries too. But getting that sniper kill is harder than winding up close enough to Felwinter's Lie some poor kid from a mile away.