Definitely check point of impact vs. point of aim with the 125 grain bullets. Had a fixed sight Ruger SP101 3" that would shoot 158 bullets at various velocities to the same POI which was right on top of the front sight but would shoot 125 grain bullets a full 14" low at 15 yards.
Yep, lighter bullets shoot lower than heavy bullets,
If sights are not adjustable, stick to the158 gr
