No way Hillary Clinton is getting over 300 EV. She can't energize people to come out and vote for her like Obama in 2008 and nobody really dislikes Trump enough to vote against him, outside of people who are already staunch Democrats.
2016 is not a good year for the Democrats and people desire a change.
When was the last time you looked at a poll?
Here are some numbers I'd suggest looking at:
Recent national polls
Recent polls in, hmmm... Arizona, Georgia, or Utah
Trump's favorability rating
Any exit poll that asks about voting third party/for Clinton to republican voters