WWII Snipers sucked and couldn't kill anything past 300m! Say whaaat?!

Did WWII Snipers sucked and couldn't kill anything past 300m (330 Yards)? If they didn't suck, then why most "sniper kills" in WWII happened only inside 300m? Tony from the @Lacy's Range and Rob answer to all of this - visual demonstrations included, ha!