The depth of the power adjuster is not the same between any two rifles. To adjust an R10 (and most other regulated rifles) first you need to set the reg to the correct pressure for calibre and barrel length. The power adjuster is then used to get you to 11.something FtLb M.E. No two rifles with identical barrels will have identical depths of the power adjuster screw collar due to differences in maufacturing tolerances, e.g. hammer spring rate etc.
If you have a second hand gun there is no telling if a previous owner hay have changed hammer spring or hammer unless you measure or compare with the standard parts.