SSRS - automate report for A4 or A3

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SSRS

I am doing a landscaped report and have the following problem.

Some of the report criteria can fit onto A4 landscaped while others fit onto A3 landscaped. At the moment the report property is set to A3. The reports that could fit onto a A4 are getting printed onto A3. If I reduce then you cannot read the A3 report on the A4 size.

The question can/how can I get the report to select the correct paper size automatically, A3 or A4?

What I have tried:

Tried various settings. Tried custom paper size but you have to put in a default height & width.