I'll have to agree with Elmo here, the 1322 will not meet the 600 fps requirement as a DEC hunting implement, regardless to the fact that it has more killing power than that of the little brother, 1377.
With that, there is a new pistol that Crosman has that can, it's the Benjamin Marauder Pistol, PCP. That bad boy should have enough power to dispatch any small game, including coyotes. Problem is, it's pricey and requires an air source such as a pump or HPA air tank.
If air pistols is legal, I would stick with the 1377, pumped 10 times and find the best pellet for it in terms of going after squirrels.
I shoot explosively JSB 8.44 grain lead pellets in my springer, and a lighter 7.4-7.9 grain in my pumps. I prefer a more hollowpoint pellet for the pumps, as I'm most likely closer range with the pump.
Graybeard, if you need to check the speed, I have a chrony that you can use.