Whats your target....
I have always gone to the simplest. So now I just use for all my shooting a simple Horizontal line with a simple verticle line that starts at the horizontal going up . I use a white piece of paper and use what ever DARK colored marker or crayon handy. LIne thickness varries with distance to target. If I cannot see it I just add thickness at the range... but after a couple hundred you get the hang of that.....