Seen it attested to for as low as 950 and high as 1250. Now having said that allow me to reiterate something. "It doesn't matter what you are shooting if you cannot hit the right spot. If you hit them in the eye with a .22 rimfire they will go down."

Get a caliber that puts out that amount of ft/lbs to the extent of your accurate range. Be sure its a load you can handle recoil wise and a good load for your gun. Here in OK they made the 22 centerfire's legal last year as long as its a 55 grain or up bullet. that would be great at shorter ranges but not so hot at 400 which is a shot you might get to take out here.

Hey, size may not matter but it sure IS nice!