I put Ken Farrel's 40 MOA base on my 110 BA... and I love it. I didn't much care for the Buzz Lightyear factory rail either... rough on the hands, and unnecessary dead weight. And I couldn't dial out to a mile with only 20 MOA...
Installed Farrel 40 MOA base on my 110BA...
One advantage to going higher up in slant is with some scopes, you can't accidentally dial a revolution too low, and get lost as to where your 100 yard zero is. (But with the scope you're considering, with 125 MOA of travel, it will likely still dial more than a rev below your 100 yard zero)...
I have a Leupold Mk4 E/RT (8.5-25x) on my 110BA, and with the 40 MOA Farrel base it will only dial about 2 MOA under my 100 yard zero. My friend has the FCP (also in 338 LM) and he got the same 40 MOA base, and his 100 yard zero is also only an MOA or two from rock bottom. And both rifles dial fine to and from there...
I'd go with the 40 MOA base. At some future point, you may end up with another scope on that rifle without as much elevation travel...
You'll want to go with Lapua brass... and Retumbo has been the best powder in our experience. 89.3 grains of Retumbo with Sierra's 300 grain Matchkings (when you can find them!) is an amazing combo... try it, and you'll likely want no other load.
Dan