I know the .22's are all but impossible to find unless you run across one on the classifieds. As for the .177 caliber version,,, I'll bet if you used heavier pellets it would be an awesome hunter. Or,,, you could always swap the barrel with a .22 or even a .20 I guess.
I've often thought about ordering the .177 version just to have a "matched pair", but they are a little pricey and there are to many other guns that I also want to order.
Jeff