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I did read once that is makes a difference between 'Add Items to our Secure Cart' as opposed to 'Add to Cart'
I read that 'Add to Cart' gets a different response to 'Buy Now' ... but the wordings are getting off the original point a little.
Just checked some of my sites and I have (subconsciously) been creating bigger 'Add to Cart' buttons over the years. Site most recently overhauled has 181x28px, I will probably update others to this size too. Or even do a split test, but that would be far too sensible!
I see that Amazon UK has 106x22 and 166x27px.
Your suggested size of 260x60 does sound on the large side. Does your site have a fixed width layout? If not, what screen resolution do you typically use? It might look OK at 1280 wide but less so at 1024. Maybe you could test which button sizes work best, either A/B or even just run with different sizes for a week at a time and compare results (conversions or checkout starts).