Walkingthemup,
TradMark would be one of the more knowledgeable users of the Barnes XPB on this site from what I know.
Barnes did update their load data for this bullet and cartridge on their website if you haven't checked it out yet.
I like the XPB from the limited amount I have used it (killed one mule deer a few years back with it, see added picture)
But, If I were after Eland, I would feel more comfortable with the 300gr Swift. then you know you'd have it covered.
You are asking in the right place though, so much experience on this site!