I just got back from SA. I took my father on a trip for his 70th birthday. I brought my Chapuis 450-400 along and ended up taking blue wildebeest, bushbuck, duiker, and impala with it. My father took a blue wildebeest as well with it.

Anyways I'm completely hooked on DRs, it's just a total thrill. I came back and realized I'd like to get a light double for plains game. I also realize I know absolutely nothing about these rifles. After a little research I'm leaning to 7x65r, scoped with a Leupold VX-6 2-12x40. Do I get it in SxS or OxU? Which is more accurate for longer shots, maybe 250 meters? Am I missing any great cartridges that outperform the 7x65r?

Any experienced brain power would be appreciated! I'm loosing sleep over this decision.