Tamper Shape Vs. Extraction – Flat & Convex

When I get my hands on...

some new coffee toys I can't help but put them to the test.  So when I got the Pullman Big Step tamper I decided to see how it compares to the La Marzocco Convex tamper.  When I say compares I don't mean in looks, because lets face it, that Pullman is a handsome piece.  What I am comparing is the extraction percentages using a refractometer which measures the total dissolved solids (TDS) inside a liquid.  In simpler terms it basically is telling me how much coffee is pulled out into the water.

In this test I used the same coffee, same grind size, same basket, same tamping pressure (confirmed by a bathroom scale), same shot time, and output. I have to say, the results aren't massively different, but do show a difference in extraction percentages.  Be sure to check out the video above for all of the numbers, and remember in the end espresso is a finicky little beverage.  This just goes to show you that every piece of the process matters.  Choose your tools wisely.


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