I'd go for the 17hmr or 22mag in a Sportster for conditions like that, never heard what a 22 hornet sounds like, but would add that to the list too if they're close to as quiet as the 2 rimfires and yotes past 100yds are on the menu. One nice thing about the hmr is the bullets will not ricochet like the 22mag bullets will lest you use the Vmax rounds in the 22mag.