Dumb question about hold overs with SFP reticle

[grayfox]

You can adjust for different magnification, however, I would use a grid target with 1moa grid at different magnification to verify accuracy of magnification ring/reticle.

Yes, the SFP reticles are proportionate at other magnifications. So if calibrated for 20x, then each 1 MOA at 20x would be=2 moa at 10x. Strelok (even the free version) has the reticles re-calibrated for you at any magnification but you can also do it by the math...
Like Ric says however, that is the ideal situation so do some verifications on a 1" grid target to ensure your reticle hashmarks, MOA clicks, and elevation/windage clicks are all calibrated ok.

Some reticles like the "bdc" style have MOA mutiples like 1.5, 4.5, 7 etc which makes it difficult to use at the non-calibrated magnif's -- which is one reason I ditched my Nikon BDC's for straight-MOA hashmark style reticles.