Those little buggers are reeking havok on the bank of my pond farthest away from my house 100-150 yrds away. Beyond that they disappear into the brush, and they won't come over to this side of the pond. My 10/22 just won't reach out that far accurately. I'm trying to decide between the 17hm2, 17hmr, 22mag, and possibly the 22hornet if I could find one. If I need more thump than that I'll just grab my 270. What are your experiences with big ol' fat groundhogs at that range?