I've never shot it, but I'm looking at the same thing. Supposedly a near-equivalent to the 300 WSM
, though not nearly as popular. Slightly shorter case, I'm told can fit into a 308 action wheras the 300 WSM is a little too long. Might be harder to get ammo in some locations, and brass might become a problem if the cartridge eventually peters out. This is what I've learned, but most here would know a lot more than me.
I'd rather have the WSM, but since I can't find a Sendero in that I'll probably get the SAUM and shoot that until the barrel is gone, then switch over.