The way I got around having to regulate my Savage 24DL chambered in .22WRM/.410 was to mount a scope with elevation+windage marks on the reticle. I first zero the scope for the .22WRM @ 75 yds and then determine the POI of slugs at 25 yds. Noting the elevation and windage marks that intersect at the slug POI establishes the point in the scope that is used to aim at the target.
There is an issue of parallax to be worked out. The scope I use is a 3-9X variable for muzzle loader/shotgun. At 9X, it is parallax-free @ 75 yds which I find useful for the .22WRM. When dialed down to 3X, there is still a wee bit of parallax but hitting 8" paper plate size targets@ 25 yds is a near certainty.
