Baskets are rated for a dose range, and going far outside it causes gushers, chokes and headspace problems.
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Measure the inside diameter of the portafilter with calipers, or check the machine manual. Breville home machines are usually 54 mm, most prosumer machines are 58 mm, and small DeLonghi units are often 51 mm.
The puck swells into the shower screen, flow is restricted and the shot tends to channel. You see it as a slow, uneven pour and a wet puck afterwards.
Rarely. It comes from the manufacturer spec. Common 58 mm sizes are 14, 18 and 22 g, while 51 and 54 mm baskets usually run 7 to 14 g.
Method last reviewed 2026-07-29. Figures are guidance, not a substitute for the ratings printed on your own equipment.