Quote Originally Posted by upSLIDEdown View Post
... Maybe it's me. Maybe I've gotten hot/fatigued and am pulling shots, but I don't think so. We always seem to start around 500yds though, and start backing up. Maybe I need to start out at 1000 and see how things go next time...
Not just you. That jump from 800 to a 1000 yards gets challenging for most shooters, but as LoneWolf states it starts with the platform and then the shooter.

Not sure if the 260 Rem has any better legs to reach out to 1300 yards than the 308. With Berger 6.5mm 140gr Match Long Range VLDs, my drop at a 1000 yards is almost 30 feet and 2x that at 1300. .308 175gr Match Long Range VLD drop is worse (32 feet @ 1000 and 70 feet at 1300). Add in even a gentle breeze and things will get real interesting for either caliber.