Max moa picatinny rail for S&B Zenith 3-12x50

[Overthehill]

As per the title lads, I'm wondering what's the max moa picatinny rail, I can use with the S&B Zenith 3-12x50 scope. I zero at 160yds...1" above poa at 100yds. I want to get as much of the elevation as possible. 10 or 20 Moa rail? Thanks
Also I'm looking at scope specs and some of the big names don't have much elevation... Am I wrong or does this mean they're not suited to 'medium to long' range use? Whereas my scope is supposed to have 27 mrad elevation, yet I'm in the red (posicon turret) when shooting out to 400yds...?

 

[Malxwal]

Hmm, 27 mrad in a 3-12 Zenith , Anyhoo, buy whatever inclination rail you wish, more inclination in the rail gives you more of the available adjustment in the scope. Youu can always use higher rings. I know the Zenith has an odd objective end, so mounting can be a pest. As long as you can still get good cheek weld (otherwise no point at shooting longer distance).
My Zenith is fitted to my 270. It has the old style BDC turret, and my bullets are doing about 3300 and zeroed 1" high at 100, and I need 1mrad or 10 clicks to get to 400 yds.

 

[Overthehill]

Thx for the reply. I need 23 clicks to get to 400 yds...