if you want to snipe stay in core cuz in hardcore: 1 you die way too easy to just b sitting there waiting, 2 almost nobody is actually is stupid enough to run out in the open so you get less kills, 3even if you get kills its gay cuz sniping in hardcor is just gay
in core its really easy to get super long range headshots on rush since the maps are long and many people stay outside or are visible and you get a "marksman headshot bonus" that adds to your score whatever range it is at so. basicly core is more rewarding, more fun, less gay. that pretty much sums it up