Max adjustment question

[Dvldog6.5G]

Hello all. This may be a amature question, but I am looking into getting a couple of scopes for longer range shooting and hunting. One for the 6.5G and one for my 6.5CM. Of course the Grendel not too long range hunting, but will be having long range fun with them both. For example when the Vortex viper PST 3-15 says max elevation is 22 mills is that total or is that 44 total? I ask because I don’t want to put a 20 moa rail on something that only has 22 mills adjustment then I can’t even zero. I have been shooting a long time, just not long range and dialing. It’s kinda confusing trying to figure this out.

Thanks in advance,
Semper Fi!!