David, you've probably seen me mention the 129 ABLR for this, I like that one over a healthy dose of Lever. The operating range of that bullet is pretty ideally suited to the Grendel.
I have not killed deer with any of the 123's yet but would be willing to use either the ELDM or SST, but others can report more accurately on those. I have not worked with the 100 or 125gr Partition at all but would consider them if the 129 ABLR were not available.
