Let's see. You are already experiencing the classic POI shift Leupold is famous for yet you're considering getting another. And installing it on a rifle with decent recoil energy. Well, OK...
Insanity: doing the same thing over and over again expecting different results.
Albert Einstein
IIRC the VX-6 uses a leaf spring in the erector cell?
Vari-X III has a single leaf spring and the VX-3 and VX-6 have 2 leaf springs so you are not comparing apples with apples. Why do I want a scope on a rifle that weighs 11 ounces more then a VX-6 ? If you are Not twisting turrets and have a long action that can't use the NXS 2.5-10x42 which is the only NF similiar in dimensions.
The NF 2x10x42 with the right mounts will work on a LA.
I guess with a Picatinny rail, you can mount about anything.
Target shooter use them. To me, they're not very pretty and I don't want one for a sleek, hunting rifle.
Otherwise, you're into offset bases and/or rings, these options aren't as nice looking as std. rings, IMO. And with offsets, you're suddenly into higher rings.
DF