Is the wear experienced in service due in some part to erosion?
"Results" of a test method using abrasion can be very misleading.
The outfit I worked for made a bunch of material decisions doing that and some of the results were di$appointing.
Tmoose, that's a good point. I think the type of testing desired would more correctly be described as "wear rate" testing, rather than "wear resistance" testing. "Wear resistance" is subjective, while "wear rate" can be quantified.
Which ASTM galling tests are you looking for ? I do not have very successful experience with ASTM Galling test. You may want to consider developing your own test for your own application.