I'm 17.I am new to the forum but not new to the slaying of fur balls. Here in central oregon we have rock chucks,AKA Yellow Bellied Marmmots).They have keen eye sight.20-100 yds shots are the norm but we also have the ones that have been to school.Laying on rock piles hundreds of yards away,see you come across a cow pasture and go down.I need help forming rounds to get that job done.What bullets are good to start with.50-55gr plus be able to buck wind,smack coyotes.Thanks