I have both a Swarovski with BRH and Zeiss with Z800, both on magnum 7mm guns.
I much prefer the Z800 as it gives you a reticle for every distance form 200-800 yards and in 25 yard increments from 300 yards to 800. The BRH only gives me exact reticles out to 500 yards with my combination.
The BRH reticle is almost too thin for use in low light at normal hunting distances. I would not want The Z800 to be any thinner (better than the BRH). These reticles were designed for hunting not precision target shooting at 1000 yards.
I also like the 5 and 10 mph wind holds at every 100 yard increment on the Z800 over the 10 and 20 mph wind holds that are only on every other bar on the BRH.
I use the Z800 as designed, I do not turn the elevation turret so it does not matter if I cant use MOA ect. Run the program for the Z800 with your load and see what it does to your calibration magnification at different elevations,temps. You can taylor you calibration magnification to keep the reticle true at different elevations and temperatures (not hard, I only need two magnification settings to keep the reticle true between 5000 feet at 70 degrees and 9500 feet at 30 degrees as an example).
Pick a load your rifle shoots well and have at it. I agree that its not a versatile of a system as turning turrets or using MOA reticles but it was not designed or intended for this.