No one here would argue that a Rem 700 or a Win 70 in .308 or .30-06 is incapable of hitting a target at a grand. While the OP's friend back east is most probably exaggerating his marksmanship skills dont lets start arguing the rifle is INCAPABLE of doing it. A rack grade Mosin with surplus? Improbable. An off the wall Rem or Win with hunting ammo? Also improbable. However after some basic modifications with a good peice of glass, match ammo, and a good shooter highly likely.
Sent from my PRC 117A in my Batmobile disguised as a sedan.