I'll preface this question by acknowledging that a precise answer is impossible. Does anyone know how far a ricochet can travel if the screaming projectile is traveling at 800 or 1,600 or 2,400 feet per second??? The question arises from shooting 100 and 200 yards (a lot of rounds) at targets in the middle of a, rather rocky, 450 yard deep field with a high berm of a stock tank at the end of the field and houses 1.35 miles from the shooting bench. My concern is the the field has a lot of rocks from 3" to 6" all over the place. My buddy that took me shooting there was unconcerned, believing that the berm was keeping things safe, until I raised the question. He was also frightened by the recognition that ricochets were even occurring, made apparent by my suppressor's allowing him to shoot without ear protection. I'm thinking that a 5.56 or 7.62 round glancing off a 6" rock could easily travel the 1 1/3 mile!!! Any opinions or actual data??? HKS Happy T-Giving all. Safe shooting.