You could inquire with the Hide member currently selling one in the classifieds here.
He may be willing to check the the available travel in the unit he is selling, but I can't see it being any different than mine.
Every HDMR and DMR has exactly the same amount of travel, and I can't see the XRS having any more variation than the gen. 1 model.
Before I bought mine I asked the seller to check the available travel; I already have a Spuhr 44.4 MOA (13 mil) mount and didn't want to have to replace it.
I am very close to the bottom of the travel with a 100 yard zero; I am less than a mil from the limit, so I have over 30 mils elevation available.
Joe