May work fair in good lighting, but in poorer lighting conditions will probably lack any definition.
I believe Elmer Keith recommended a horizontal line inscribed on the front blade for long range shooting. Can't remember now exactly how he did it, but I seem to recall he used a file to inscribe the line - and maybe filled in the line with paint to highlight it?
I guess I'd do a lot of experimenting with temporary lines before I got out the file!