As you may have figured out if you used either of Excals 'Zones' which are 2.5-4x variables, the magnification setting is what makes the addition aim points 'on' for 30, 40, and 50.
If you change the power setting on a variable, you will also change the poi for any reference point [such as duplex's] while the crosshair one stays the same.
Danny Miller, USA warranty rep had some Leupold Vx II's converted to crossbow reticules, I have a 2x7. It's not ideal for hunting as it has small lines and diamonds for 30 and 50 yds. It's great for testing groups ect on 7x. Mine needs about 2.5-3x for the other ranges to be 'on'. They are no longer being converted as the co doing them closed up shop, IIRC.
He currently offers Leupold vaiable w/ duplex hairs that will adj to 3 ranges. You can check w/ him, phone only, at [740] 483-2312.
My pick for a hunting xbow scope is the Vari-zone, don't care for the clutter in some of the others out there.