The .204 is really similar to the 22-250, except it hits a little harder and faster at longer ranges. But really not much. About 1 inch less drop at over 400yds. And it's just slightly less energy at short ranges - but it uses less powder, and doesn't heat the barrel up as much. It's a friggin ridiculously fast round - and either one of them takes care of groundhog problems with ease. I've got a .22 mag also - but the problem is that at anything over about 50yds, those groundhogs are tough and they can survive. The .204 does away with that problem - period. I will say, however, the .204 has a crazy penetrating crack when it fires.
I have more than 11 acres, but am right next to a large farm - so it's impossible to permanently eliminate groundhogs. The dumb SOBs keep coming over. The bigger problem than what they do to my "yard" (the acres I cut with a Kubota finish mower) are the holes they make even in other parts that are just plain dangerous. Used to have horses here, and you know what those holes can do to the leg of a horse.
). Drink beer, speak Dutchy and expect 6 more weeks of winter. 
