When I mashed with a single infusion, I’d tighten the mill as far as it would go which followed Denny’s advice. In fact, I started all grain brewing patterned on his setup. A guy named Don Osborn does videos on Youtube using his method which is how I learned to brew. It made getting into all grain very approachable.
But now, I use a Recirculating Infusion Mash System and perform Hochkurz-style steps. That fine a crush with a thicker qt/lb ratio mash thickness would compact the grainbed, I’d get poor extract and often frustrating brew days due to a cavitated pump. So, I began making adjustments for my system and how I operate it.
I ended up with a ~.7 gpm flow rate, a .040 mill setting, and a 1.75 qts/lb mash thickness as my combination sweet spot. I’ve thought I might mash thinner but I am happy with my results at this point.
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