it's needed for extreme long range
work, and/or heavy recoil. If you don't do it, the scope wont "track" striaight up and down as you adjust for elevation, and will "drift" bullet POI off to one side. It will also cause nonaligned torque forces to be applied unequally to the scope, and that will sooner or later ruin the scope, with heavy recoiling rounds. Go to Patriot Network and read Teuf's post about it.
work, and/or heavy recoil. If you don't do it, the scope wont "track" striaight up and down as you adjust for elevation, and will "drift" bullet POI off to one side. It will also cause nonaligned torque forces to be applied unequally to the scope, and that will sooner or later ruin the scope, with heavy recoiling rounds. Go to Patriot Network and read Teuf's post about it.