Since factory loadings are so poor and so limited, the Roberts is a handloading proposition. I've had one since 1977, and it's my favorite rifle. I've killed around 30 whitetails with it, using 100 grain bullets, and it has taken no few coyotes and even prairie dogs with Sierra 75 gr HP's.
As a handloader, and this is a handloading forum, I'd pick the 6.5mm Swede over the 260. It's an old low-pressure version of the more modern, higher-pressure 260.
