I have not tried these on groundhogs. They are accurate and work VERY WELL on feral cats and the occasional crow in the backyard. Possibly use them for head shots on the groundhogs. You will need to re-sight your rifle, as they shoot a bit lower. I have a .22 dedicated to the CB, CB Long, Quiet-22. They all shoot to the same point of aim in my rifle.
http://www.cci-ammunition.com/products/detail.aspx?use=3&loadNo=960
I haven't shot/tried these yet. These should work VERY WELL also. They are a bit pricey.
http://www.cci-ammunition.com/products/detail.aspx?use=2&loadNo=0970
I am using CB Longs on the crows as they SEEM to be more accurate than CB Shorts in my rifle. I will continue to use the CB Longs for crows as the Quiet-22 penetrate better and the Segmented are pricey. I have switched to the Quite-22 Solids and will try the Quiet-22 Segmented for the bigger stuff.
