I've read nowhere that a single should land in half that I.e. Step 7: Swirl and taste! Clearing excess grounds is essential for "updosed" shots. The volume of coffee delivered is dictated by the extraction time and choice of filterholder/dose. Press J to jump to the feed. If you ask for a single, the barista will likely pull a double but use a split portafilter to halve the shot for you. As such, the standard brew head cannot yield a volumetric double shot, but it can easily extract a beautiful and balanced weight-based double shot of espresso. /*