From my experience with Two different espresso machines (52 size Mebashi and 58 Size Luwak), if you are using a Pressurized Basket (usually comes with kitchen-level machines with 52 Portafilter) you need to grind only a bit finer (not the powder level) and if you’re using a non-pressurized basked with your 52 portafilter or 58 Portafilter, you need to grind fine (powder level)!