Mike, Thank you very much for the information. Sounds like from what you are saying step one is to find a rifle load (in this case 8 x 57jr) that shoots to point of aim with the metal sights or possibly modify the metal sights if required or a little of both. Then adjust the scope to match the rifle cartridge and particular load that is regulated for the drilling. At this point if you are lucky the slugs may regulate also but not necessarily. If not then learn the gun and adjust holdover, etc or try different slugs and see if any work better.

Thanks, Ron