A question I'm asked often. What dosage? How many grams? Here is a simple rule of thumb to start you off with but as we know, there are so many variables affecting coffee extraction in espresso so you'll need to play around, take note, adjust but this should help you get started!

For the bottomless portafilter review (purchase links in the description of the video) https://youtu.be/UDDvEIig5zE