Yes 10-12 at the usual 1.25 quarts. I've done up to 14 pounds with using a lower water to grist ratio. Green Bay Rackers Mash Calculator.
Scroll down to the "can I mash it" calculator. It's a valuable tool to use to figure out how much grain can be hel in any sized mash tun.
I've been using my 5 gallon for 6-7 years and have never had a problem with 99% of my batches. The others, the rare barleywine I either borrow someone's larger cooler, or do a 2.5 gallon batch.
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Revvy's one of the cool reverends. He has a Harley and a t-shirt that says on the back "If you can read this, the bitch was Raptured. - Madman
I gotta tell ya, just between us girls, that Revvy is HOT. Very tall, gorgeous grey hair and a terrific smile. He's very good looking in person, with a charismatic personality... he drives like a ****ing maniac! - YooperBrew