RE: homemade range finder
Get yourself a spool of braided nylon string 90' in length, tie one end to your tree and stretch the other end out into your shooting lanes. Where the string ends, tie a piece of colored surveyor's tape. Do not shoot past the surveyor's tape as this should be your limit if you cannot judge distance. As you get more experienced, you can invest in more string and tape. This concludes my homemade range finder lesson.