Steve,

2500 at the muzzle sounds pretty much perfect then.

The likely ranges will depend on the area you hunt, but assuming you don't book somewhere like the Kalahari, you can expect most shots to be 50-100 yards or so.

With that load and calibre, you don't really need to step up to the PSP for eland. The SP would be fine if you put it in the right place. Sure eland are slightly bigger than a buff, but they're not as strongly built and they're nowhere near as tenacious.