This is a Zeus Pro, not a mk3 60mm ... but it is on a rem700 .300WM(24) ... and the idea I used here would work for the mk3 60mm as well ... riser, reversed with the long end hanging off the back of the scope base.
Now in this case, with the 20 moa base and the extra elevation, I was only crank DOWN on the Zeus to where I was 3 mils high at 100yds, which meant I was zeroed at like 675yds. So I had to hold down, all the way out to 500yds, which is as far as I shot it. But the zeus had a mil square reticle, which was usable on 2x digital (8x net), so I could hold down just fine.
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This is Pulsar XD50a on the same gun ...
And this worked way better, because the out of the box pulsar mount is reversable and can be cantilever forward or cantilever backwards ... or cantilevel nuetral, three positions. So with it in cantilever backwards, it worked fine on the 20 moa base and this setup worked out to 500yds as well.
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So it would work better on a flat base. But on a 20 moa base, you might have to hold down if you can't crank down enough MOA on the scope to zero at 100yds without holding down.
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No issues with scope contact. It is up high on these mounts. The issue is getting it far enough to the rear to get decent eye relief.