lots of patterns have been posted. they do really well. I've built 6 so far for myself, family, and friends. I've yet to see one not pattern, but I'm also shooting TSS handloads thru them.
I've seen anywhere from 400+ in a 10" circle at 40 yards down to 250ish in the 10". Probably saw my best killing pattern this past Friday. A buddy's gun I built show at 286 and 280 in the 10" and 20" circles at 40 yards respectively. Nice even pattern. I told him not to touch it to chase higher numbers in the 10 at 40yds.