I worked at Costa years ago and each pull of the lever on the grinder dispensed a shot, double shop two pulls. I think in my head all grinders were the same. Sadly not.
Those chambers are incredibly inconsistent, dose weight by volume varies on density, roast level, grind size...
Really the only way to be consistent is to weigh your dose into the portafilter.
@Matisse started
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I worked at Costa years ago and each pull of the lever on the grinder dispensed a shot, double shop two pulls. I think in my head all grinders were the same. Sadly not.