Thanks for all the recommendations! I talked to some local groundhog hunters, and they really like the 17 hornet. The local gunship owner said that everybody that he knows that tried one really liked it. So I went with the hornet. After shooting a groundhog at 175 yards and seeing thw damage, I think I will be happy with it!

......the occasional hunter wielding a hopelessly inaccurate rifle, living by the fantastical rule that this cartridge can deliver the goods, regardless of shot placement or rifle accuracy. The correct term for this is minute of ego.