Built this for a friend to make it easier for him to understand. I prefer the 25 yard zero for myself in the .223 s it has the numbers I like with minimal rise and drop out to 500 thats very acceptable even using irons and just 2 dots on a mil dot scope @ 400 and 500 yards . I also did one for 7.62X39 because I have that upper for a AR . I chose the 20 yard zero as it keeps the numbers pretty close out to 300 which is about as effective as that round is . Pass it on and hope you can put it to good use .