Jeremy Corbyn's supporters are rounding on the YouGov survey which suggests Theresa May would lose 20 seats, but the figure should not be taken at face value.
The poll also found Labour would gain 28 while the Lib Dems would gain one, the SNP would lose four and the Greens and Plaid Cymru would have one each.
This would leave the Tories with 310 seats – 16 short of the 326 needed for an overall Commons majority and would produce a hung parliament.
The YouGov poll showed the Tories could lose, but could also gain a majority
However, YouGov has admitted the new seat-specific modelling allows a wide margin for error, with the other end of the spectrum showing the Tories winning 345 seats at next Thursday's General Election – 15 more than they have now which would hand them more than the majority they need to lead Britain out of the EU.
On a "bad night" the pollsters said the Tories could lose as many as 56 seats.
YouGov, the UK's leading polling company, said the recently developed technique had been used to successfully predict the result of the EU Referendum.
It also successfully predicted Hillary Clinton would win the popular vote in last year's US Presidential election by a narrow margin, but showed the midwestern battleground states were too close to call.
Both the EU referendum and the US Presidential election had been wrongly predicted by other polls.
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However, the company admitted the new method was "controversial" and indicated significant "churn" in voting intentions.
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Meanwhile a new Panelbase poll puts the Conservative lead on 48 points, giving them a 15 percentage point lead over Labour Party on 33 points.
It marks a one-point gain from the May 15 election and has sent sterling higher to a point which almost recoups the day's losses.
For the latest election predictions panellists were selected by YouGov, with 50,000 interviews carried out over a week to allow for every type of voter to be covered.
The poll claimed the Tories could lose a majority in the election
Politicians from all sides of the spectrum have slated the new poll, with Labour still believing the Tories will gain a majority.
Shadow education secretary, Angela Raynor said: "I don't trust polls. Anyone who trusts polls are naive."
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A Labour candidate in the Midlands said Jeremy Corbyn's unpopularity is continuing to deter natural Labour voters and said the party would be losing not gaining seats in his region.
A prominent Conservative said a majority of 50 or more was expected, despite an "atrocious" campaign as they insisted anger over the manifesto is fading.
Other pollsters have called the decision to use a new model eight days before the election "brave".
Deborah Mattinson, founder of Britain Thinks, tweeted: "YouGov not just at odds with other pollsters but also with their ex top honcho Peter Kellner who predicts Con lead 66 seats…brave stuff."
Martin Boon, of ICM Polling, added: "Splashing this on the front page is even braver than YouGov doing it in the first place."
Stephen Shakespeare, YouGov's chief executive, said the poll is only a central projection which "allows for a wide range of error".
He said: "However, these are just the midpoints and, as with any model, there is leeway either side. The Tories could end up with as many as 345 and Labour as few as 223, leading to an increased Conservative majority."