1000 yards can be done with a 16" barrel 308, but not with PRVI 175 grain ammo. Their 175 FMJBT has some consistency issues and doesn't group for shit. Out of a short barrel, the velocity isn't going to be there to get the lighter bullets out to 1000. You need to anticipate the bullet going subsonic before reaching the target. That means big, heavy bullets that can transition into subsonic trajectory without destabilizing. I've had pretty decent results shooting 190 grain SMK and Nosler Custom Comps out to 1000 yards from a 16" 308 AR with a 1:11 twist barrel. I typically get about a 60% hit ratio on an 11X18 steel plate at that distance. It's not an ideal rifle for shooting that far, but it can do it with a fair degree of consistency. Having said that, I would not put the words "1000 yard rifle" in the title of a for sale thread if I were going to sell it. Realistically, it's more like an 800 yard rifle if you want reliable hits.