Making one by hand would work fine also.
Actually when used on Leupold Target Turrets it is just a matter of running a ballistic table and typing in the numbers you want on the excel spread sheet. Print, cut out, and tape on the scope turret. The pictures above are for a .223, 55 gr Hornady, at 3050 fps - and a 22-250, 50 gr Hornady V max, at 3775 fps. Also made up some for windage. If there is an interest I can try and post a picture later.
When trying to fit on another type scope such as Bushnell or Burris, some messing with the spread sheet is needed. That definitely gets somewhat frustrating for me.