Ruth Davidson appealed to tactical voters to halt the SNP's crusade for independence
The Scottish Tory reached out to Labour and Liberal Democrat supporters arguing her party was the "best bet" in dealing the Nationalists a blow.
Her appeal came as Nicola Sturgeon insisted if her party again wins most Scottish seats it will clear the path to another referendum and see Theresa May's block "crumble into dust."
The First Minister wants an independence vote as early as autumn 2019 despite Mrs May confirming she will reject her demand for the power to hold one.
She has argued that her mandate for a plebiscite derives from last year's Holyrood election, but that a Nationalist victory on June 8 would reinforce it.
But a bullish Ms Davidson predicted Tories will win more than than the one seat they secured in 2015, with Ms Sturgeon's party falling short of its record 56 seats.
With Labour in disarray SNP depute leader Angus Robertson has predicted the June ballot with be a "two-horse race in Scotland between the SNP and the Tories".
The First Minister wants an independence vote as early as autumn 2019
We're the strongest party to take on the SNP
And the election north of the Border will be dominated by his party's bid to break up Britain.
Ms Davidson warned both Labour and the Lib Dems were to weak to defend the Union.
She said: "We're the strongest party to take on the SNP.
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"I know there was a lot of talk a couple of years ago at the general election about tactical voting and all the rest of it. I've never been a particular proponent of it
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The nationalist chief always has plenty to say
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'Men – the colour of their tie is the most difficult decision they have to make every day'
"But I think, if you do believe in tactical voting and you have a principled belief in keeping the United Kingdom together and respecting the decision that we made in 2014, actually your vote is for the Scottish Conservatives.
"You have a Labour leader in Jeremy Corbyn who says he would be happy to let another referendum happen, the Lib Dems just aren't strong enough.
"It is very much a case of, if you're not supporting the SNP and you want somebody to stop their drive to break up Scotland then the Scottish Conservatives are your best bet."
Mrs May has insisted that the election will allow her to build a 'stronger Britain'
Ms Davidson ruled out standing as an MP, but said "three or four" of her MSP colleagues could run for Westminster.
She is confident of making gains after more than doubling the number of MSPs she has in last year's Holyrood election.
These included constituency seats in the South of Scotland, Ayrshire, the Borders and West of Scotland.
Politicians react to Theresa May's snap general election Wed, April 19, 2017
UK Prime Minister Theresa May has announced her intention to hold an early general election on June 8
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Theresa May has called for a snap general election
Speaking at the launch of her party's manifesto for the May 4 council elections Ms Davidson said: "There is no way the SNP is getting 56 this time, not if I have anything to do with it."
She also predicted gains in the local government vote which would act as "springboard" for June.
Mrs May has insisted that the election will allow her to build a "stronger Britain" as she takes negotiations forward to leave the European Union.
But Ms Sturgeon yesterday again hit out at the U-turn over an early poll accusing Mrs May of taking the decision for "party advantage".
Speaking on a visit to London she also claimed the UK Government is set to move further right "than Ukip ever dreamed."
The First Minister added: "If the SNP wins this election in Scotland and the Tories don't, then Theresa May's attempt to block our mandate to give the people of Scotland a choice over their own future will crumble into dust.
Live from 10 Downing Street: Theresa May calls snap general election Tue, April 18, 2017
Theresa May has made the announcement to call for an early general election to be held on June 8 2017
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Britain's Prime Minister Theresa May speaks to the media outside 10 Downing Street, in central London
"We intend to win this election in Scotland and for Scotland because now, more than ever, Scotland needs a strong voice.
"Only the SNP stands between Scotland and an increasingly hard line Tory government."
Scottish Labour leader Kezia Dugdale said her party's election "planning is well underway" and said it "will be putting forward a positive vision for a fairer UK that rejects both the Tories' plans for a hard Brexit and the SNP's plans for a divisive second independence referendum."