I don't have pdogs or sage rats to shoot at. I do shoot ground squirrels, but use a .22lr for them.
My .222 is my rifle of choice when I'm walking mixed cover and rolling fields for coyotes.
The 50 sierra sp kills quickly and leaves a dime or nickel sized exit...
If I ever feel like it lacks anything, I will try a faster 40.
I love a speedy bullet, but all things are relative...
If I ever run low on the sierras I might try something else. This is the more likely scenario...