I've seen the chart here, probably from Bobby_M or FlyGuy that shows how much grain I can get into a 10 Gal (or 5) MLT but I can't find it despite various searches.
Anyone able to lend me a hand and have the link handy, I'd appreciate it.
It'll tell you how big a beer you can make in your mash tun. So for example, in a 10 gallon MLT doing a 10 gallon batch, with 1.25 qt/liter mash thickness and 75% efficiency, you can do max 1.069 OG beer.
Last Friday night I did a batch in my 10 gallon Igloo cooler using 18# grain and 1.50 qts/lb water and it fit (heavy as hell, but it fit).
I also got 80% efficiency