snake bite... try this...http://varmintair.typepad.com/varmintairs_blog/fwb-300s-sporter/This website will show you that all you need is accuracy to hunt ground squirrels at 40+ yards. This guy is my hero. I actually tried this set up and i get grey squirrels at 40 yards with my own FWB 300s. mind you, even tuned mine shoots 8.44 gr pellets at 650 fps. But it is stoooopid accurate. So yeah, 15 fpe is plenty as long as you hit where it counts.
I'm sure that most things can be done with the .177, but it seems to me that in order to get enough "Knock-Down" power, you would have to get a Magnum speed gun, and they seem to be harder to shoot... especially, Off-Hand. I considered a .25 cal, but changed my mind... pellets are not easy to find.Snakebite