60 gr aguila SSS if I was shooting suppressed, or some type of high velocity solid if not. I would prefer my .22 magnum but if all I could use was my 10/22 then it would be the Aguila with a lane suppressor and fast twist barrel. only take shots at the brainstem from the side or back ideally side and tucked in close to the base of the ear. I wouldn't do a facing headshot if I could avoid it, between the eyes if I'm in an elevated position such as a deck or treestand would be doable. I've heard the lung shots work and frequently well, but I've never tried one.
