I would think it would have to be stamped “M118LR” to coincide with the military 175g AA11 load. M118 used a 173g projectile as was referred to as M118 Special Ball. I believe the 168 smk was used in the M852 load.
I’d check with Leupold if you really want to be sure.
Like I said, M118 was the designation for the 173g special ball match load that was being issued at the time to M24 and M21 end users in the Army and elsewhere.
My guess is that it would be pretty close to the 175 until about 500 or so then significant differences would begin to appear. Again, just a guess on my part.