@lewm Yep, gotcha on the gain. My point, which I didn't explain very well, is that despite both inputs having sufficient gain to run a 0.1mv, the MM input with a 0.1mv sounds a bit noisier than the MC. Given that the MM input generally sounds better, it's worth seeking out a cartridge with sufficient output, perhaps .25 or greater, to take advantage of the MM input on the Steelhead.
Actually, using the MM on the Steelhead is pretty new to me so I'm still discovering the best way to set things up. I'd always run into the MC with the various cartridges I've owned, from 0.1 through 0.4mv.