Shimming a tang sight doesn't make enough difference ine levation to matter. I have drifted the front sight on some rifles but sometiems enough windage is involved to loosen the front sight, resulting in some minor gunsmithing to make it stay put again. Also, some rifles don't have driftable front sights.
I also have a Lyman 30-1/2 in my "Savage collection" and it makes life better. But not all tang sights are windage adjustable.
