FX Impact barrel kit decisions

"MarcoPolo"The plan is to use it for mostly squirrels, groundhogs, raccoons, and coyote. These are in order of the majority of my game to least majority of my game. So mostly squirrels, a good bit of Coons and ground hogs and every once in a while a coyote. 

Thanks!
If 90% squirrels and a slight forecast of hogs and coyotes then .25 is perfect. You will have more shots per fill, bigger pellet selection(including the heavy mk2), and quieter report. Just make sure to aim for the head for big stuff like coyotes and hogs since you won't have the size and energy of a .30. Try to be extra close too!