Guess I should have asked my question differently, is the 20 MOA mount taller than a standard mount, or does it point the scope upward to get the most out of the elevation adjustment? Not sure there's even such a thing, kinda new to long range shooting and just trying to get up to speed on it.
Thanks
Exactly. They are for getting 20moa more elevation in addition to whatever you end up with after zeroing. I believe Conquests have 75moa of adjustment. So, depending of a 100 yard or 200 yard zero, you will have ballpark 37 moa of 'up' left over. A canted rail like the EGW would give you a hypothetical 57ish moa of up.
If you are using your rifle for a simple hunting setup you won't need one, as you will zero it and forget it. The only downside to a canted rail, really is that you don't look directly through the center of the scope and some scopes are slightly distorted, some are not noticeable. It's also nice to not have the adjustment close to being maxed out continually.
If you are wanting to flex it into a long range rig, you will be dialing the turrets frequently. In that case the extra 20moa can add up to a lot more range. That rifle and scope combo isn't ideal, and is certainly geared towards hunting, but for fun can be stretched out pretty far. When using a rifle in multiple roles you have to choose your trade offs. For hunting it is nice to have a compact capped turrets like the Conquest has, but they do make exposed turrets for them if you want to dial up and down a lot. This thread has some good info:
Elevation Turret for Zeiss Conquest 3-9x40? - 24hourcampfire
If you've already ordered the Conquest, cool. If not, and are really wanting to dial out past 400yards much, the Weaver mentioned above would be a better choice for 'tactical' use, but not as ideal for hunting as the Conquest. I'd suggest learning with the Ruger/Conquest combo, then save it aside as a light weight hunter and get a whole new rifle and scope later on for dedicated long range precision. You can easily get a nice budget setup under $1k.
Heavy barrels, exposed turrets, bipods etc., are very useful for long range stuff, but very inconvenient for most hunting.