Start at 5 yds with a bullseye or a pieplate. Just bring your rifle up to your line of sight and get that flash picture and fire. Do this enough so that your groups are damn near one-holers. Go to 15 yds and do the same. Go to 25 yds, 35 yds, 50 yds 65 yds 75 yds, and finally 100 yds. After you get your groups offhand within a 8"-10" paper pieplate, you're good to go. You can then experiment at further ranges as you see fit. You'll expend several hundreds of rounds and maybe a thousand or two as you go along.